International Residential
Building Code	 2003 Florida Building Code	Proposed Changes to the 
International Building Code	
CHAPTER 9
ROOF ASSEMBLIES
		CHAPTER 9
ROOF ASSEMBLIES
	
SECTION R901
GENERAL
		SECTION R901
GENERAL	
R901.1 Scope. The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies. 

	Exception:  Buildings and structures located within the High Velocity Hurricane Zone shall comply with the provisions of Chapter R44.	R901.1 Scope. The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies. 
Exception:  Buildings and structures located within the High Velocity Hurricane Zone shall comply with the provisions of Chapter R44. (See attached).	
SECTION R902 
ROOF CLASSIFICATION
		SECTION R902 
ROOF CLASSIFICATION
	
R902.1 Roofing covering materials. Roofs shall be covered with materials as set forth in Sections R904 and R905. Class A, B or C roofing shall be installed in areas designated by law as requiring their use or when the edge of the roof is less than 3 feet (914 mm) from a property line. Classes A, B and C roofing required to be listed by this section shall be tested in accordance with UL 790 or ASTM E 108. Roof assemblies with coverings of brick, masonry, slate, clay or concrete roof tile, exposed concrete roof deck, ferrous or copper shingles or sheets, and metal sheets and shingles, shall be considered Class A roof coverings.
		R902.1 Roofing covering materials. Roofs shall be covered with materials as set forth in Sections R904 and R905. Class A, B or C roofing shall be installed in areas designated by law as requiring their use or when the edge of the roof is less than 3 feet (914 mm) from a property line. Classes A, B and C roofing required to be listed by this section shall be tested in accordance with UL 790 or ASTM E 108. Roof assemblies with coverings of brick, masonry, slate, clay or concrete roof tile, exposed concrete roof deck, ferrous or copper shingles or sheets, and metal sheets and shingles, shall be considered Class A roof coverings.
	
R902.2 Fire-retardant-treated shingles and shakes. Fire-retardant-treated wood shakes and shingles shall be treated by impregnation with chemicals by the full-cell vacuum-pressure process, in accordance with AWPA C1. Each bundle shall be marked to identify the manufactured unit and the manufacturer, and shall also be labeled to identify the classification of the material in accordance with the testing required in Section R902.1, the treating company and the quality control agency.
		R902.2 Fire-retardant-treated shingles and shakes. Fire-retardant-treated wood shakes and shingles shall be treated by impregnation with chemicals by the full-cell vacuum-pressure process, in accordance with AWPA C1. Each bundle shall be marked to identify the manufactured unit and the manufacturer, and shall also be labeled to identify the classification of the material in accordance with the testing required in Section R902.1, the treating company and the quality control agency.	
SECTION R903
WEATHER PROTECTION
		SECTION R903
WEATHER PROTECTION
	
R903.1 General. Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof assemblies shall be designed and installed in accordance with this code and the approved manufacturer’s installation instructions such that the roof assembly shall serve to protect the building or structure.		R903.1 General. Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof assemblies shall be designed and installed in accordance with this code and the approved manufacturer’s installation instructions such that the roof assembly shall serve to protect the building or structure.	
R903.2 Flashing. Flashings shall be installed in such a manner so as to prevent moisture entering the wall and roof through joints in copings, through moisture permeable materials, and at intersections with parapet walls and other penetrations through the roof plane.
		R903.2 Flashing. Flashings shall be installed in such a manner so as to prevent moisture entering the wall and roof through joints in copings, through moisture permeable materials, and at intersections with parapet walls and other penetrations through the roof plane.
	
R903.2.1 Locations. Flashings shall be installed at wall and roof intersections; wherever there is a change in roof slope or direction; and around roof openings. Where flashing is of metal, the metal shall be corrosion resistant with a thickness of not less than 0.019 inch (No. 26 galvanized sheet).
	Mod 484   (Needs to locate Table)

1503.2.1 Locations.  Flashings shall be installed at (1) wall and roof intersections, (2) at gutter, (3) wherever there is a change in roof slope or direction, this requirement does not apply to hip and ridge junctions, and (4) around roof openings.  Where flashing is of metal, the metal shall be corrosion-resistant with a thickness of not less than 0.019 inch (26 gage (0.551 mm) galvanized sheet).  not less than provided in Table 1503.2.2.  
	R903.2.1 Locations. Flashings shall be installed at wall and roof intersections; wherever there is a change in roof slope or direction; this requirement does not apply to hip and ridge junctions, and around roof openings. Where flashing is of metal, the metal shall be corrosion resistant with a thickness of not less than 0.019 inch (No. 26 galvanized sheet).  not less than provided in Table 1503.2.2.  

	
Mod 593

Table 1507.3.9.2 Valley Lining 1503.2.2 Metal Flashing Material

Material	
Minimum 
Thickness (inches)	
Gage	
Weight 
(lbs per sq ft)	

Copper	

1 (16 oz)	

Aluminum	
 0.024	

Stainless Steel	
	
    28	

Galvanized Steel	
0.0179	
26 (zinc coated G90)	

Aluminum Zinc
Coated Steel	

.0179	

26  (AZ50 Alum Zinc)	

Zinc Alloy	
0.027	

Lead	

2.5	

Painted Terne	

20 1.25 
(20 oz)	

	
Table 1507.3.9.2 Valley Lining 1503.2.2 Metal Flashing Material

Material	
Minimum 
Thickness (inches)	
Gage	
Weight 
(lbs per sq ft)	

Copper	

1 (16 oz)	

Aluminum	
 0.024	

Stainless Steel	
	
    28	

Galvanized Steel	
0.0179	
26 (zinc coated G90)	

Aluminum Zinc
Coated Steel	

.0179	

26  (AZ50 Alum Zinc)	

Zinc Alloy	
0.027	

Lead	

2.5	

Painted Terne	

20 1.25 
(20 oz)	

	
R903.3 Coping. Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width no less than the thickness of the parapet wall.
	Mod 633  (Not in IRC)

1511.6.2 Coping.  All parapet walls shall be properly coped or sealed with noncombustible, weatherproof materials of a width no less that the thickness of the parapet wall.
	R903.3 Coping. Parapet walls shall be properly coped or sealed with noncombustible, weatherproof materials of a width no less than the thickness of the parapet wall.
	
R903.4 Roof drainage. Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the roof. Where required for roof drainage, scuppers shall be placed level with the roof surface in a wall or parapet. The scupper shall be located as determined by the roof slope and contributing roof area.
		R903.4 Roof drainage. Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the roof. Where required for roof drainage, scuppers shall be placed level with the roof surface in a wall or parapet. The scupper shall be located as determined by the roof slope and contributing roof area.
	
R903.4.1 Overflow drains and scuppers. Where roof drains are required, overflow drains having the same size as the roof drains shall be installed with the inlet flow line located 2 inches (51 mm) above the low point of the roof, or overflow scuppers having three times the size of the roof drains and having a minimum opening height of 4 inches (102 mm) shall be installed in the adjacent parapet walls with the inlet flow located 2 inches (51 mm) above the low point of the roof served. The installation and sizing of overflow drains, leaders and conductors shall comply with the International Plumbing Code.
 Overflow drains shall discharge to an approved location and shall not be connected to roof drain lines.	Mod 634  

1511.6.4.1  Where required for roof drainage, a scupper shall be placed level with the roof surface in a wall or parapet.  The scupper shall be located as determined by the slope and the contributing area of the roof.  The exterior facing or lining of a scupper, if metal, shall be the same as valley lining flashing material required by 1503 through 1510 for the particular type of covering specified for the building.  For other type materials, follow manufacturer’s specifications.

Mod 635  (Already covered in IRC)

1511.6.4.3  When other means of drainage of overflow water is not provided, overflow scuppers shall be placed in walls or parapets not less than 2 inches (51 mm) nor more than 4 inches (102 mm) above the roof deck finished roof covering and shall be located as close as practical to required vertical leaders or downspouts or wall and parapet scuppers.  An overflow scupper shall be sized in accordance with the Florida Building Code, Plumbing.	R903.4.1 Overflow drains and scuppers. Where roof drains are required, overflow drains having the same size as the roof drains shall be installed with the inlet flow line located 2 inches (51 mm) above the low point of the roof, or overflow scuppers having three times the size of the roof drains and having a minimum opening height of 4 inches (102 mm) shall be installed in the adjacent parapet walls with the inlet flow located 2 inches (51 mm) above the low point of the roof served. The exterior facing or lining of a scupper, if metal, shall be the same as valley lining flashing material required by 1503 through 1510 for the particular type of covering specified for the building.  For other type materials, follow manufacturer’s specifications.  
The installation and sizing of overflow drains, leaders and conductors shall comply with the International Plumbing Code.
 Overflow drains shall discharge to an approved location and shall not be connected to roof drain lines.
	
SECTION R904
MATERIALS
		SECTION R904
MATERIALS
	
R904.1 Scope. The requirements set forth in this section shall apply to the application of roof covering materials specified herein. Roof assemblies shall be applied in accordance with this chapter and the manufacturer’s installation instructions. Installation of roof assemblies shall comply with the applicable provisions of Section R905. 
		R904.1 Scope. The requirements set forth in this section shall apply to the application of roof covering materials specified herein. Roof assemblies shall be applied in accordance with this chapter and the manufacturer’s installation instructions. Installation of roof assemblies shall comply with the applicable provisions of Section R905. 	
R904.2 Compatibility of materials. Roof assemblies shall be of materials that are compatible with each other and with the building or structure to which the materials are applied.
		R904.2 Compatibility of materials. Roof assemblies shall be of materials that are compatible with each other and with the building or structure to which the materials are applied.
	
R904.3 Material specifications and physical characteristics. Roof covering materials shall conform to the applicable standards listed in this chapter. In the absence of applicable standards or where materials are of questionable suitability, testing by an approved testing agency shall be required by the building official to determine the character, quality and limitations of application of the materials.
		R904.3 Material specifications and physical characteristics. Roof covering materials shall conform to the applicable standards listed in this chapter. In the absence of applicable standards or where materials are of questionable suitability, testing by an approved testing agency shall be required by the building official to determine the character, quality and limitations of application of the materials.
	
R904.4 Product identification. Roof covering materials shall be delivered in packages bearing the manufacturer’s identifying marks and approved testing agency labels when required. Bulk shipments of materials shall be accompanied with the same information issued in the form of a certificate or on a bill of lading by the manufacturer.
		R904.4 Product identification. Roof covering materials shall be delivered in packages bearing the manufacturer’s identifying marks and approved testing agency labels when required. Bulk shipments of materials shall be accompanied with the same information issued in the form of a certificate or on a bill of lading by the manufacturer.
	
SECTION R905
REQUIREMENTS FOR ROOF COVERINGS 
		SECTION R905
REQUIREMENTS FOR ROOF COVERINGS 
	
R905.1 Roof covering application. Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer’s installation instructions.
		R905.1 Roof covering application. Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer’s installation instructions.
	
R905.2 Asphalt shingles. The installation of asphalt shingles shall comply with the provisions of this section.		R905.2 Asphalt shingles. The installation of asphalt shingles shall comply with the provisions of this section.	
R905.2.1 Sheathing requirements. Asphalt shingles shall be fastened to solidly sheathed decks.
		R905.2.1 Sheathing requirements. Asphalt shingles shall be fastened to solidly sheathed decks.
	
R905.2.2 Slope. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.
		R905.2.2 Slope. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.
	
R905.2.3 Underlayment. Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type I, or ASTM D 4869, Type I.
Self-adhering polymer modified bitumen sheet shall comply with ASTM D 1970.
	Mod 195

1507.3.4 Self-adhering polymer modified bitumen sheet. Self-adhering polymer modified bitumen sheet
shall comply with ASTM D 1970. (ASTM D 1970-95 Self Adhering Polymer Modified Bituminous Sheets used as Steep Roof Underlayment for Ice Dam Protection)

Mod 591

1507.3.3  Underlayment.  Unless otherwise noted, required underlayment shall conform with ASTM D 226, (Type I or Type II) or ASTM D 4869, (Type I or Type II).
	R905.2.3 Underlayment. Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type I or Type II ASTM D 4869, Type I or Type II.
Self-adhering polymer modified bitumen sheet shall comply with ASTM D 1970.
	
R905.2.4 Asphalt shingles. Asphalt shingles shall have self-seal strips or be interlocking, and comply with ASTM D 225 or D 3462.
		R905.2.4 Asphalt shingles. Asphalt shingles shall have self-seal strips or be interlocking, and comply with ASTM D 225 or D 3462.
	
R905.2.5 Fasteners. Fasteners for asphalt shingles shall be galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gage [0.105 inch (2.67 mm)] shank with a minimum 3/8-inch (9.5 mm) diameter head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the fasteners shall penetrate through the sheathing. Fasteners shall comply with ASTM F 1667.
	Mod 749

1506.5.1 Nails shall be corrosion resistant nails conforming to ASTM F 1667. The corrosion resistance shall meet ASTM A 641, Class 1 or an equal corrosion resistance by coating, electro galvanization, mechanical galvanization, hot dipped galvanization, stainless steel, nonferrous metal and alloys or other suitable corrosion resistant material.
1506.5.1.1 The nail component of plastic cap nails shall meet the corrosion resistance requirements of 1506.5.1. 
	R905.2.5 Fasteners. Fasteners for asphalt shingles shall be galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gage [0.105 inch (2.67 mm)] shank with a minimum 3/8-inch (9.5 mm) diameter head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the fasteners shall penetrate through the sheathing. Fasteners shall comply with ASTM F 1667.

R905.2.5.1 The nail component of plastic cap nails shall meet ASTM A 641, Class I or an equal corrosion resistance by coating, electro galvanization, mechanical galvanization, hot dipped galvanization, stainless steel, nonferrous metal and alloys or other suitable corrosion resistant material.
	
R905.2.6 Attachment. Asphalt shingles shall have the minimum number of fasteners required by the manufacturer. For normal application, asphalt shingles shall be secured to the roof with not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 20 units vertical in 12 units horizontal (20:12), special methods of fastening are required. For roofs located where the basic wind speed per Figure R301.2(4) is 110 mph (177 km/h) or greater, special methods of fastening are required. Special fastening methods shall be tested in accordance with ASTM D 3161, modified to use a wind speed of 110 mph (177 km/h). Shingles classified using ASTM D 3161 are acceptable for use in wind zones less than 110 mph. Shingles classified using ASTM D 3161 modified to use a wind speed of 110 mph are acceptable for use in all cases where special fastening is required.
		R905.2.6 Attachment. Asphalt shingles shall have the minimum number of fasteners required by the manufacturer. For normal application, asphalt shingles shall be secured to the roof with not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 20 units vertical in 12 units horizontal (20:12), special methods of fastening are required. For roofs located where the basic wind speed per Figure R301.2(4) is 110 mph (177 km/h) or greater, special methods of fastening are required. Special fastening methods shall be tested in accordance with ASTM D 3161, modified to use a wind speed of 110 mph (177 km/h). Shingles classified using ASTM D 3161 are acceptable for use in wind zones less than 110 mph. Shingles classified using ASTM D 3161 modified to use a wind speed of 110 mph are acceptable for use in all cases where special fastening is required.
	
R905.2.7 Underlayment application. For roof slopes from two units vertical in 12 units horizontal (17-percent slope), up to four units vertical in 12 units horizontal (33-percent slope), underlayment shall be two layers applied in the following manner. Apply a 19-inch (483 mm) strip of underlayment felt parallel with and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened sufficiently to hold in place. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater, underlayment shall be one layer applied in the following manner. Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened sufficiently to hold in place. End laps shall be offset by 6 feet (1829 mm).
		R905.2.7 Underlayment application. For roof slopes from two units vertical in 12 units horizontal (17-percent slope), up to four units vertical in 12 units horizontal (33-percent slope), underlayment shall be two layers applied in the following manner. Apply a 19-inch (483 mm) strip of underlayment felt parallel with and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened sufficiently to hold in place. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater, underlayment shall be one layer applied in the following manner. Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened sufficiently to hold in place. End laps shall be offset by 6 feet (1829 mm).	
R905.2.7.1 Ice protection. In areas where the average daily temperature in January is 25°F (-4°C) or less or when Table R301.2(1) criteria so designates, an ice barrier that consists of a least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.
Exception: Detached accessory structures that contain no conditioned floor area.
	Mod 195

1507.3.8.3 Ice shield. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.
	R905.2.7.1 Ice protection. In areas where the average daily temperature in January is 25°F (-4°C) or less or when Table R301.2(1) criteria so designates, an ice barrier that consists of a least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.
Exception: Detached accessory structures that contain no conditioned floor area.
	
R905.2.7.2 Underlayment and high wind. Underlayment applied in areas subject to high winds [greater than 110 mph (177km/h) per Figure R301.2(4)] shall be applied with corrosion-resistant fasteners in accordance with manufacturer=s installation instructions. Fasteners are to be applied along the overlap not farther apart than 36 inches (914 mm) on center.
		R905.2.7.2 Underlayment and high wind. Underlayment applied in areas subject to high winds [greater than 110 mph (177km/h) per Figure R301.2(4)] shall be applied with corrosion-resistant fasteners in accordance with manufacturer=s installation instructions. Fasteners are to be applied along the overlap not farther apart than 36 inches (914 mm) on center.
	
R905.2.8 Flashing. Flashing for asphalt shingles shall comply with this section.
		R905.2.8 Flashing. Flashing for asphalt shingles shall comply with this section.	
R905.2.8.1 Base and cap flashing. Base and cap flashing shall be installed in accordance with manufacturer’s installation instructions. Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness or mineral surface roll roofing weighing a minimum of 77 pounds per 100 square feet (3.76 kg/m2). Cap flashing shall be corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness.
	Mod 680

1507.3.9 Flashings.  Flashing for asphalt shingles shall comply with 1507.3.9.
1507.3.9.1  Base and cap counter flashing.
1507.3.9.11 Base and cap counter flashing shall be installed as follows:

a.	In accordance with manufacturer’s installation instructions, or
b.  A continuous metal “L” flashing shall be set in approved flashing cement and set flush to base of wall and over the underlayment.  Both horizontal and vertical metal flanges shall be fastened 6 inches on center with approved fasteners.  All laps shall be a minimum of 4 inches fully sealed in approved flashing cement.  Flashing shall start at the lower portion of roof to insure water-shedding capabilities of all metal laps.  The entire edge of the horizontal flange shall be sealed covering all nail penetrations with approved flashing cement and membrane.  Shingles will overlap the horizontal flange and shall be set in approved flashing cement.

1507.3.9.1.2 Base flashing shall be of either corrosion resistant metal of minimum nominal 0.019 inch (0.483 mm) thickness with a minimum thickness provided in section 1507.3.9.2 or mineral surface roll roofing weighing a minimum of 77 lb per 100 sq ft (3.76 kg/m2).  Cap Counter flashing shall be corrosion resistant metal of minimum nominal 0.019 inch (0.483 mm) with a minimum thickness provided in Table 1507.3.9.2. 

Mod 592

1507.3.9.1  Base and cap counter flashing.  Base and cap counter flashing shall be installed in accordance with manufacturer’s installation instructions.  Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019 inch (0.483 mm) thickness with a minimum thickness provided in section 1507.3.9.2 or mineral surface roll roofing weighting a minimum of 77 lb per 100 sq ft (3.76 kg/m2).  Cap Counter flashing shall be corrosion resistant metal minimum nominal 0.019 inch (0.483 mm) thickness of minimum thickness provided in Table 1507.3.9.2.
	R905.2.8.1 Base and cap counter flashing. Base and cap counter flashing shall be installed in accordance with manufacturer’s installation instructions, or
a continuous metal “L” flashing shall be set in approved flashing cement and set flush to base of wall and over the underlayment.  Both horizontal and vertical metal flanges shall be fastened 6 inches on center with approved fasteners.  All laps shall be a minimum of 4 inches fully sealed in approved flashing cement.  Flashing shall start at the lower portion of roof to insure water-shedding capabilities of all metal laps.  The entire edge of the horizontal flange shall be sealed covering all nail penetrations with approved flashing cement and membrane.  Shingles will overlap the horizontal flange and shall be set in approved flashing cement.

Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness provided in Section 1507.2.9.1 or mineral surface roll roofing weighing a minimum of 77 pounds per 100 square feet (3.76 kg/m2). Cap Counter flashing shall be corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness.  with a minimum thickness provided in Table 1507.2.9.2.
	
R905.2.8.2 Valleys. Valley linings shall be installed in accordance with manufacturer’s installation instructions before applying shingles. Valley linings of the following types shall be permitted:
1.	For open valley (valley lining exposed) lined with metal, the valley lining shall be at least 24 inches (610 mm) wide and of any of the corrosion-resistant metals in Table R905.2.8.2.
2.	For open valleys, valley lining of two plies of mineral surface roll roofing, complying with ASTM D 249, shall be permitted. The bottom layer shall be 18 inches (457 mm) and the top layer a minimum of 36 inches (914 mm) wide.
3.	For closed valleys (valley covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D 224 Type II or Type III and at least 36 inches (914 mm) wide or valley lining as described in Items 1 and 2 above shall be permitted. Specialty underlayment complying with ASTM D 1970 may be used in lieu of the lining material.
			
TABLE R905.2.8.2
VALLEY LINING MATERIAL

MATERIAL
Cold-rolled copper
Lead-coated copper
High-yield copper
Lead-coated high-yield copper
Aluminum
Stainless steel
Galvanized steel
Zinc alloy
Lead
Painted terne

MINIMUM THICKNESS
(inches)
0.0216 nominal
0.0216 nominal
0.0162 nominal
0.0162 nominal
0.024
___
0.0179
0.027
___
___

GAGE
___
___
___
___
___
28
26 (zinc coated G90)
___
___
___

WEIGHT
(pounds)
ASTM B370, 16 oz. per square foot
ASTM B101, 16 oz. per square foot
ASTM B370, 12 oz. per square foot
ASTM B101, 12 oz. per square foot
___
___
___
___

2 ½
20
		TABLE R905.2.8.2
VALLEY LINING  METAL FLASHING MATERIAL

MATERIAL
Cold-rolled copper
Lead-coated copper
High-yield copper
Lead-coated high-yield copper
Aluminum
Stainless steel
Galvanized steel
Aluminum zinc coated steel
Zinc alloy
Lead
Painted terne

MINIMUM THICKNESS
(inches)
0.0216 nominal
0.0216 nominal
0.0162 nominal
0.0162 nominal
0.024
___
0.0179 
0.0179
0.027
___
___

GAGE
___
___
___
___
___
28
26 (zinc coated G90)
26 (AZ50 Alum Zinc)
___
___
___

WEIGHT
(pounds)
ASTM B370, 16 oz. per square foot
ASTM B101, 16 oz. per square foot
ASTM B370, 12 oz. per square foot
ASTM B101, 12 oz. per square foot
___
___
___
___

2 ½
20 1.25 (20 oz)

(This Section not needed.  Refer to Metal Flashing Material Chart)	

	Mod 596  (Not in IRC)

1507.3.9.3  Drip edge.  Drip edge shall be provided at eaves and gables of shingle roofs, and overlapped a minimum of 2 inches (51 mm).  Eave drip edges shall extend ¼ inch (6.4 mm) below sheathing and extend back on the roof a minimum of 2 inches (51 mm). Drip edge shall be mechanically fastened a maximum of 12 inches (305 mm) on center.  Drip edge at eaves shall be permitted to be installed either over or under the underlayment.  If installed over the underlayment, there shall be a minimum 2 inch width of roof cement installed over the drip edge flange.
	R905.2.8.2  Drip edge.  Drip edge shall be provided at eaves and gables of shingle roofs, and overlapped a minimum of 2 inches (51 mm).  Eave drip edges shall extend ¼ inch (6.4 mm) below sheathing and extend back on the roof a minimum of 2 inches (51 mm). Drip edge shall be mechanically fastened a maximum of 12 inches (305 mm) on center.  Drip edge at eaves shall be permitted to be installed either over or under the underlayment.  If installed over the underlayment, there shall be a minimum 2 inch width of roof cement installed over the drip edge flange.
	
	Mod 681   (New Section)

1507.3.9.2.1 Metal roofing accessories.  
All metal accessories for roofs shall not be less than 26 gage G-90 galvanized, stainless steel 28 gage, or AZ 50 aluminum zinc coated steel 26 gage.
	
(This Section not needed.  Refer to Metal Flashing Material Table)

R905.2.8.3 Crickets and saddles. A cricket or saddle shall be installed on the ridge side of any chimney greater than 30 inches (762 mm) wide. Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.
	Mod 598

1507.3.9.4 1507.3  Crickets or Saddles  A cricket or saddle shall be installed on the ridge side of any chimney greater than 30 inches (762 mm) wide.  Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.
	R905.2.8.3 Crickets and saddles. A cricket or saddle shall be installed on the ridge side of any chimney greater than 30 inches (762 mm) wide. Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.
	
R905.2.8.4 Sidewall flashing. Flashing against a vertical sidewall shall be by the step-flashing method.
		R905.2.8.4 Sidewall flashing. Flashing against a vertical sidewall shall be by the step-flashing method.
	
R905.2.8.5 Other flashing. Flashing against a vertical front wall, as well as soil stack, vent pipe and chimney flashing, shall be applied according to asphalt shingle manufacturer’s printed instructions.
		R905.2.8.5 Other flashing. Flashing against a vertical front wall, as well as soil stack, vent pipe and chimney flashing, shall be applied according to asphalt shingle manufacturer’s printed instructions.
	
R905.3 Clay and concrete tile. The installation of clay and concrete shall comply with the provisions of this section. Clay roof tile shall comply with ASTM C1167.
		R905.3 Clay and concrete tile. The installation of clay and concrete shall comply with the provisions of this section. Clay roof tile shall comply with ASTM C1167.
	
R905.3.1 Deck requirements. Concrete and clay tile shall be installed only over solid sheathing or spaced structural sheathing boards.
	Mod 423  

Deck requirements.  Concrete and clay tile shall be installed only over solid sheathing or except where the roof covering is specifically designed and tested in accordance with 1606.3.2 to be applied over structural spaced sheathing boards.
	R905.3.1 Deck requirements. Concrete and clay tile shall be installed only over solid sheathing or except where the roof covering is specifically designed and tested in accordance with 1606.3.2 to be applied over structural spaced sheathing boards.

	
R905.3.2 Deck slope. Clay and concrete roof tile shall be installed on roof slopes of two and one-half units vertical in 12 units horizontal (21/2:12) or greater. For roof slopes from two and one-half units vertical in 12 units horizontal (21/2:12) to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.3.3. 
	Mod 599

1507.4.2.2  Deck slope.  Clay and concrete roof tile shall be installed on roof slopes of 
2 ½:12 or greater.  For roofs sloped from 2 ½:12 to 4:12 double underlayment application is required in accordance with 1507.4.3. in accordance with the recommendations of FRSA/RTI 07320.
	R905.3.2 Deck slope. Clay and concrete roof tile shall be installed on roof slopes of two and one-half units vertical in 12 units horizontal (21/2:12) or greater. For roof slopes from two and one-half units vertical in 12 units horizontal (21/2:12) to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.3.3.  in accordance with the recommendations of FRSA/RTI 07320.
	
R905.3.3 Underlayment. Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type II; ASTM D 2626, Type I; or ASTM D 249 mineral surfaced roll roofing.	Mod 600

1507.4.3 Underlayment.  Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type II; ASTM D 2626;Type I  ASTM D 1970; or ASTM D 249 6380 mineral surfaced roll roofing.
	R905.3.3 Underlayment. Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type II; ASTM D 2626, Type I; ASTM D 1970 or ASTM D 249 6380 mineral surfaced roll roofing.	
R905.3.3.1 Low slope roofs. For roof slopes from two and one-half units vertical in 12 units horizontal (21/2:12), up to four units vertical in 12 units horizontal (4:12), underlayment shall be a minimum of two layers underlayment applies as follows:
1.	Starting at the eave, a 19-inch (483 mm) strip of underlayment shall be applied parallel with the eave and fastened sufficiently in place.
2.	Starting at the eave, 36-inch-wide (914 mm) strips of underlayment felt shall be applied, overlapping successive sheets 19 inches (483 mm), and fastened sufficiently in place.
		R905.3.3.1 Low slope roofs. For roof slopes from two and one-half units vertical in 12 units horizontal (21/2:12), up to four units vertical in 12 units horizontal (4:12), underlayment shall be a minimum of two layers underlayment applies as follows:
1.	Starting at the eave, a 19-inch (483 mm) strip of underlayment shall be applied parallel with the eave and fastened sufficiently in place.
2.	Starting at the eave, 36-inch-wide (914 mm) strips of underlayment felt shall be applied, overlapping successive sheets 19 inches (483 mm), and fastened sufficiently in place.
	
R905.3.3.2 High slope roofs. For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion, parallel to and starting from the eaves and lapped 2 inches (51 mm), fastened sufficiently in place.
		R905.3.3.2 High slope roofs. For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion, parallel to and starting from the eaves and lapped 2 inches (51 mm), fastened sufficiently in place.
	
R905.3.3.3 Underlayment and high wind. Underlayment applied in areas subject to high wind [greater than 110 miles per hour (177 km/h) per Figure R301.2(4)] shall be applied with corrosion-resistant fasteners in accordance with manufacturer’s installation instructions. Fasteners are to be applied along the overlap not farther apart than 36 inches (914 mm) on center.
		R905.3.3.3 Underlayment and high wind. Underlayment applied in areas subject to high wind [greater than 110 miles per hour (177 km/h) per Figure R301.2(4)] shall be applied with corrosion-resistant fasteners in accordance with manufacturer’s installation instructions. Fasteners are to be applied along the overlap not farther apart than 36 inches (914 mm) on center.
	
R905.3.4 Tile. Clay roof tile shall comply with ASTM C 1167.
		R905.3.4 Tile. Clay roof tile shall comply with ASTM C 1167.
	
R905.3.5 Concrete tile. Concrete roof tile shall comply with ASTM C 1492.
	Mod 682  (Not in IRC)

1507.4.5.2	Concrete Tile.  
1507.4.5.2.1
Roof tile shall comply with ASTM C 1492  be in accordance with the physical test requirements as follows:
1.	The transverse breaking strength of tiles shall be determined according to Section 5.3 of ASTM C 1167 and in accordance with Table 1507.4.5.2.1
2.	The absorption of concrete roof tiles shall be according to Section 8 of ASTM C 140.  Roof tiles shall absorb not more that 12% of the dry weight of the tile during a 24-hour immersion test.
3.	3.    Roof tiles shall be tested for freeze/thaw resistance according to Section 8 of ASTM C 67.  Roof tiles shall show no breakage and not have more that 1% loss in dry weight of any individual concrete roof tile.
	R905.3.5 Concrete tile. Concrete roof tile shall comply with ASTM C 1492.
	
R905.3.6 Fasteners. Nails shall be corrosion-resistant and not less than 11 gage, 5/16-inch (10.6 mm) head, and of sufficient length to penetrate the deck a minimum of 3/4 inch (19.1 mm) or through the thickness of the deck, whichever is less. Attaching wire for clay or concrete tile shall not be smaller than 0.083 inch (2.1 mm). Perimeter fastening areas include three tile courses but not less than 36 inches (914 mm) from either side of hips or ridges and edges of eaves and gable rakes.
		R905.3.6 Fasteners. Nails shall be corrosion-resistant and not less than 11 gage, 5/16-inch (10.6 mm) head, and of sufficient length to penetrate the deck a minimum of 3/4 inch (19.1 mm) or through the thickness of the deck, whichever is less. Attaching wire for clay or concrete tile shall not be smaller than 0.083 inch (2.1 mm). Perimeter fastening areas include three tile courses but not less than 36 inches (914 mm) from either side of hips or ridges and edges of eaves and gable rakes.
	
R905.3.7 Application. Tile shall be applied in accordance with this chapter and the manufacturer’s installation instructions, based on the following:
1.	Climatic conditions.
2.	Roof slope.
3.	Underlayment system.
4.	Type of tile being installed.
Clay and concrete roof tiles shall be fastened in accordance with this section and the manufacturer’s installation instructions. Perimeter tiles shall be fastened with a minimum of one fastener per tile. Tiles with installed weight less than 9 pounds per square foot (0.43 kN/m2) require a minimum of one fastener per tile regardless of roof slope. Clay and concrete roof tile attachment shall be in accordance with the manufacturer’s installation instructions where applied in areas where the wind speed exceeds 100 miles per hour (161 km/h) and on buildings where the roof is located more than 40 feet (12 192 mm) above grade. In areas subject to snow, a minimum of two fasteners per tile is required. In all other areas, clay and concrete roof tiles shall be attached in accordance with Table R905.3.7.
	Mod 101

1507.4.4 Application Standards.  Clay and concrete tile shall be applied in accordance with the manufacturer’s installation instructions or recommendations of the FRSA/NTRMA 07320
FRSA/RTI 07320.

Mod 692  (Table not in IRC)

1507.4.5.2.1 Transverse Breaking Strength of Concrete Roof Tile

Delete the entire table, the information is out of date.

	R905.3.7 Application. Tile shall be applied in accordance with this chapter and the manufacturer’s installation instructions or recommendations of the FRSA/RTI 07320 based on the following:
1.	Climatic conditions.
2.	Roof slope.
3.	Underlayment system.
4.	Type of tile being installed.
Clay and concrete roof tiles shall be fastened in accordance with this section and the manufacturer’s installation instructions. Perimeter tiles shall be fastened with a minimum of one fastener per tile. Tiles with installed weight less than 9 pounds per square foot (0.43 kN/m2) require a minimum of one fastener per tile regardless of roof slope. Clay and concrete roof tile attachment shall be in accordance with the manufacturer’s installation instructions where applied in areas where the wind speed exceeds 100 miles per hour (161 km/h) and on buildings where the roof is located more than 40 feet (12 192 mm) above grade. In areas subject to snow, a minimum of two fasteners per tile is required. In all other areas, clay and concrete roof tiles shall be attached in accordance with Table R905.3.7.
	
TABLE R905.3.7
CLAY AND CONCRETE TILE ATTACHMENT
	Mod 602

1507.4.7 Attachment. Clay and concrete roof tiles shall be fastened in accordance with 1507.4 and section 1606 Table 1507.4.7 or in accordance with FRSA/RTI Installation Manual.

Delete Table 1507.4.7
	TABLE R905.3.7
CLAY AND CONCRETE TILE ATTACHMENT
New section to read:

Attachment.  Clay and concrete roof tiles shall be fastened in accordance with FRSA/RTI Installation Manual 07320.	
R905.3.8 Flashing. At the juncture of roof vertical surfaces, flashing and counterflashing shall be provided in accordance with this chapter and the manufacturer’s installation instructions and, where of metal, shall not be less than 0.019 inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend at least 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25.4 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and greater, valley flashing shall have a 36-inch-wide (914 mm) underlayment of one layer of Type I underlayment running the full length of the valley, in addition to other required underlayment. In areas where the average daily temperature in January is 25 °F. (-4°C) or less, metal valley flashing underlayment shall be solid cemented to the roofing underlayment for slopes or be of self-adhering polymer modified bitumen sheet.
	Mod 195

1507.4.9 Flashing. At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer’s installation instructions, and where of metal, shall not be less than 0.019 inch (0.48 mm) (26 gage galvanized sheet) corrosion-resistant metal. The valley flashing shall extend at least 11 inches (280 mm) from the center line each way and have a splash diverter rib not less than 1 inch (25.4 mm) high at the flow line formed as part of the flashing. Sections of flashing
shall have an end lap of not less than 4 inches (102 mm). For roof slopes of 3:12 and over, the valley flashing shall have one layer of 36-inch-wide (914 mm) Type I underlayment running the full length of the valley, in addition to other required underlayment. For slopes under 7:12, in areas where the average daily temperature in January is 25 °F. (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solid cemented to the
roofing underlayment.

Mod 605

1507.4.9  Flashing.  At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer’s installation instructions or the recommendations of the FRSA/RTI 07320 Manual. , and where of metal, shall no be less that 0.019 inch (0.48 mm) (26 gage galvanized sheet) corrosion-resistant metal.  The valley flashing shall extend at least 11 inches (280 mm) from the center line each way and have a splash diverter rib not less that 1 inch (25.4 mm) high at the flow line formed as part of the flashing.  Sections of flashing shall have an end lap of not less than 4 inches (102 mm).  For roof slopes of 3:12 and over, the valley flashing shall have one layer of 36-inch-wide (914 mm) Type I underlayment running the full length of the valley, in addition to other required underlayment.  For slopes under 7:12, in areas where the average daily temperature in January is 25 degrees F.  (-4 degrees C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solid cemented to the roofing underlayment.

	R905.3.8 Flashing. At the juncture of roof vertical surfaces, flashing and counter flashing shall be provided in accordance with this chapter and the manufacturer’s installation instructions or recommendations of the FRSA/RTI 07320 Manual. and, where of metal, shall not be less than 0.019 inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend at least 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25.4 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and greater, valley flashing shall have a 36-inch-wide (914 mm) underlayment of one layer of Type I underlayment running the full length of the valley, in addition to other required underlayment. In areas where the average daily temperature in January is 25 °F.
(-4°C) or less, metal valley flashing underlayment shall be solid cemented to the roofing underlayment for slopes or be of self-adhering polymer modified bitumen sheet.
	
R905.4 Metal roof shingles. The installation of metal roof shingles shall comply with the provisions of this section.
		R905.4 Metal roof shingles. The installation of metal roof shingles shall comply with the provisions of this section.
	
R905.4.1 Deck requirements. Metal roof shingles shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced sheathing.
		R905.4.1 Deck requirements. Metal roof shingles shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced sheathing.
	
R905.4.2 Deck slope. Metal roof shingles shall not be installed on roof slopes below three units vertical in 12 units horizontal (25-percent slope).
		R905.4.2 Deck slope. Metal roof shingles shall not be installed on roof slopes below three units vertical in 12 units horizontal (25-percent slope).
	
R905.4.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designate, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall comply with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
	Mod 195

1507.6.3 Underlayment. Underlayment shall conform with ASTM D 226, Type I. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.

Mod 610

1507.6.3  Underlayment.  Underlayment shall conform with ASTM D 226, Type I or Type II or ASTM D 1970.  In areas where the average daily temperature in January is 25 degrees F (-4 degrees C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall of the building.
	R905.4.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designate, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 1970.
Exception: Detached accessory structures that contain no conditioned floor area.
	
R905.4.4 Material standards. Metal roof shingle roof coverings of galvanized steel shall be 0.013 inch (0.378 mm) minimum thickness. Metal roof shingle roof coverings of aluminum shall be of 0.024 inch (0.610 mm) minimum thickness.
		R905.4.4 Material standards. Metal roof shingle roof coverings of galvanized steel shall be 0.013 inch (0.378 mm) minimum thickness. Metal roof shingle roof coverings of aluminum shall be of 0.024 inch (0.610 mm) minimum thickness.
	
R905.4.5 Application. Metal roof shingles shall be secured to the roof in accordance with this chapter and the approved manufacturer’s installation instructions.
		R905.4.5 Application. Metal roof shingles shall be secured to the roof in accordance with this chapter and the approved manufacturer’s installation instructions.
	
R905.4.6 Flashing. Roof valley flashing shall be provided of corrosion-resistant metal of the same material as the roof covering or shall comply with the standards in Table R905.10.3. The valley flashing shall extend at least 8 inches (203 mm) from the center line each way and shall have a splash diverter rib not less than 3/4 inch (19.1 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). The metal valley flashing shall have a 36-inch-wide (914 mm) underlayment directly under it consisting of one layer of underlayment running the full length of the valley, in addition to underlayment required for metal roof shingles. In areas where the average daily temperature in January is 25°F (-4°C) or less, the metal valley flashing underlayment shall be solid cemented to the roofing underlayment for roof slopes under seven units vertical in 12 units horizontal (58.3-percent slope) or self-adhering polymer modified bitumen sheet.
	Mod 195

1507.6.6 Flashing. Roof valley flashing shall be provided of corrosion-resistant metal of the same material as the roof covering or shall comply with the standards in Table 1507.5.3. The valley flashing shall extend at least 8 inches (203 mm) from the center line each way and shall have a splash diverter rib not less than 3/4 inch (19 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes under 7:12, in areas where the average daily  temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the
eaves causing a backup of water, the metal valley flashing shall have a 36-inch-wide (914 mm) underlayment directly under it consisting of one layer of underlayment running the full length of the valley, in addition to underlayment required for metal roof shingles. The metal valley flashing underlayment shall be solid cemented to the roofing underlayment or of a self adhering polymer modified bitumen sheet.
	R905.4.6 Flashing. Roof valley flashing shall be provided of corrosion-resistant metal of the same material as the roof covering or shall comply with the standards in Table R905.10.3. The valley flashing shall extend at least 8 inches (203 mm) from the center line each way and shall have a splash diverter rib not less than 3/4 inch (19.1 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). The metal valley flashing shall have a 36-inch-wide (914 mm) underlayment directly under it consisting of one layer of underlayment running the full length of the valley, in addition to underlayment required for metal roof shingles. In areas where the average daily temperature in January is 25°F (-4°C) or less, the metal valley flashing underlayment shall be solid cemented to the roofing underlayment for roof slopes under seven units vertical in 12 units horizontal (58.3-percent slope) or self-adhering polymer modified bitumen sheet.
	
R905.5 Mineral-surfaced roll roofing. The installation of mineral-surfaced rolling roofing shall comply with this section.
		R905.5 Mineral-surfaced roll roofing. The installation of mineral-surfaced rolling roofing shall comply with this section.
	
R905.5.1 Deck requirements. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs.
		R905.5.1 Deck requirements. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs.
	
R905.5.2 Deck slope. Mineral-surfaced roll roofing shall not be applied on roof slopes below one unit vertical in 12 units horizontal (8-percent slope)
.
		R905.5.2 Deck slope. Mineral-surfaced roll roofing shall not be applied on roof slopes below one unit vertical in 12 units horizontal (8-percent slope).
	
R905.5.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
	Mod 195 

1507.7.3 Underlayment. Underlayment shall conform with ASTM D 226, Type I. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.

Mod 612

1507.7.3  Underlayment.  Underlayment shall conform with ASTM D 226, Type I or Type II or ASTM D 1970.  In areas where the average daily temperature in January is 25 degrees F (-4 degrees C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.
	R905.5.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I or Type II or ASTM D 1970.
Exception: Detached accessory structures that contain no conditioned floor area.	
R905.5.4 Material standards. Mineral-surfaced roll roofing shall conform to ASTM D 224, D 249, D 371 or D 3909.
		R905.5.4 Material standards. Mineral-surfaced roll roofing shall conform to ASTM D 224, D 249, D 371 or D 3909.
	
R905.5.5 Application. Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer’s installation instructions.
		R905.5.5 Application. Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer’s installation instructions.
	
R905.6 Slate and slate-type shingles. The installation of slate and slate-type shingles shall comply with the provisions of this section.

		R905.6 Slate and slate-type shingles. The installation of slate and slate-type shingles shall comply with the provisions of this section.
	
R905.6.1 Deck requirements. Slate shingles shall be fastened to solidly sheathed roofs.
		R905.6.1 Deck requirements. Slate shingles shall be fastened to solidly sheathed roofs.
	
R905.6.2 Deck slope. Slate shingles shall only be used on slopes of four units vertical in 12 units horizontal (33-percent slope) or greater.
		R905.6.2 Deck slope. Slate shingles shall only be used on slopes of four units vertical in 12 units horizontal (33-percent slope) or greater.
	
R905.6.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less or when Table R301.2(1) criteria so designates, an ice barrier that consists of a least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
	Mod 195  (FBC says Type II; IBC says Type I?)

1507.8.3 Underlayment. Underlayment shall comply with ASTM D 226, Type II. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, an ice shield that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building.
	R905.6.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C)  or less or when Table R301.2(1) criteria so designates, an ice barrier that consists of a least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave’s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I. II.
Exception: Detached accessory structures that contain no conditioned floor area.
	
R905.6.4 Material standards. Slate shingles shall comply with ASTM C 406.
		R905.6.4 Material standards. Slate shingles shall comply with ASTM C 406.
	
R905.6.5 Application. Minimum headlap for slate shingles shall be in accordance with Table R905.6.5. Slate shingles shall be secured to the roof with two fasteners per slate. Slate shingles shall be installed in accordance with this chapter and the manufacturer’s installation instructions.
		R905.6.5 Application. Minimum headlap for slate shingles shall be in accordance with Table R905.6.5. Slate shingles shall be secured to the roof with two fasteners per slate. Slate shingles shall be installed in accordance with this chapter and the manufacturer’s installation instructions.
	
TABLE R905.6.5
SLATE SHINGLE HEADLAP
		TABLE R905.6.5
SLATE SHINGLE HEADLAP
	
R905.6.6 Flashing. Flashing and counterflashing shall be made with sheet metal. Valley flashing shall be a minimum of 15 inches (381 mm) wide. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.455 mm) zinc coated G90. Chimneys, stucco or brick walls shall have a minimum of two plies of felt for a cap flashing consisting of a 4-inch-wide (102 mm) strip of felt set in plastic cement and extending 1 inch (25.4 mm) above the first felt and a top coating of plastic cement. The felt shall extend over the base flashing 2 inches (51 mm).
	Mod 616

1507.8.6 Flashing.  Flashing and counterflashing shall be made with sheet metal.  Valley flashing shall be a minimum of 15 inches (381 mm) wide.  Valley and flashing metal shall be a minimum uncoated thickness of 0.019 in. (0.48 mm) thickness provided in Table 1507.3.9.2  nonferrous metal or stainless steel.  Chimneys, stucco or brick walls shall have a minimum of two plies of felt for a cap flashing consisting of a 4-inch (102 mm) wide strip of felt set in plastic cement and extending 1 inch (25.4 mm) above the first felt and a top coating of plastic cement.  The felt shall extend over the base flashing 2 inches (51 mm).
	R905.6.6 Flashing. Flashing and counterflashing shall be made with sheet metal. Valley flashing shall be a minimum of 15 inches (381 mm) wide. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.455 mm)  thickness provided in Table XXXX.X.X.X nonferrous metal or stainless steel.  zinc coated G90. Chimneys, stucco or brick walls shall have a minimum of two plies of felt for a cap flashing consisting of a 4-inch-wide (102 mm) strip of felt set in plastic cement and extending 1 inch (25.4 mm) above the first felt and a top coating of plastic cement. The felt shall extend over the base flashing 2 inches (51 mm).

(Refer to Metal Flashing Material Table)
	
R905.7 Wood shingles. The installation of wood shingles shall comply with the provisions of this section.
	Mod 197

1507.9 Slate type Wood shingles	R905.7 Wood shingles. The installation of wood shingles shall comply with the provisions of this section.
	
R905.7.1 Deck requirements. Wood shingles shall be installed on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25.4 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners.
		R905.7.1 Deck requirements. Wood shingles shall be installed on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25.4 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners.

	
R905.7.1.1 Solid sheathing required. In areas where the average daily temperature in January is 25°F (-4°C) or less, solid sheathing is required on that portion of the roof requiring the application of an ice shield.
	Mod 195

1507.9.1.1 Solid sheathing required. Solid sheathing is required in areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water.	R905.7.1.1 Solid sheathing required. In areas where the average daily temperature in January is 25°F (-4°C)  or less, solid sheathing is required on that portion of the roof requiring the application of an ice shield.
	
R905.7.2 Deck slope. Wood shingles shall be installed on slopes of three units vertical in 12 units horizontal (25-percent slope) or greater.
		R905.7.2 Deck slope. Wood shingles shall be installed on slopes of three units vertical in 12 units horizontal (25-percent slope) or greater.
	
R905.7.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave=s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
		R905.7.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall extend from the eave=s edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.

	
R905.7.4 Material standards. Wood shingles shall be of naturally durable wood and comply with the requirements of Table R905.7.4.		R905.7.4 Material standards. Wood shingles shall be of naturally durable wood and comply with the requirements of Table R905.7.4.
	
TABLE R905.7.4
WOOD SHINGLE MATERIAL REQUIREMENTS
		TABLE R905.7.4
WOOD SHINGLE MATERIAL REQUIREMENTS
	
R905.7.5 Application. Wood shingles shall be installed according to this chapter and the manufacturer’s installation instructions. Wood shingles shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in courses, and no two joints in any three adjacent courses shall be in direct alignment. Spacing between shingles shall not be less than 1/4 inch to 3/8 inch (6.4 mm to 9.5 mm). Weather exposure for wood shingles shall not exceed those set in Table R905.7.5. Fasteners for wood shingles shall be corrosion-resistant with a minimum penetration of 1/2 inch (12.7 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Wood shingles shall be attached to the roof with two fasteners per shingle, positioned no more than 3/4 inch (19.1 mm) from each edge and no more than 1 inch (25.4 mm) above the exposure line.
		R905.7.5 Application. Wood shingles shall be installed according to this chapter and the manufacturer’s installation instructions. Wood shingles shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in courses, and no two joints in any three adjacent courses shall be in direct alignment. Spacing between shingles shall not be less than 1/4 inch to 3/8 inch (6.4 mm to 9.5 mm). Weather exposure for wood shingles shall not exceed those set in Table R905.7.5. Fasteners for wood shingles shall be corrosion-resistant with a minimum penetration of 1/2 inch (12.7 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Wood shingles shall be attached to the roof with two fasteners per shingle, positioned no more than 3/4 inch (19.1 mm) from each edge and no more than 1 inch (25.4 mm) above the exposure line.
	
TABLE R905.7.5
WOOD SHINGLE WEATHER EXPOSURE AND ROOF SLOPE		TABLE R905.7.5
WOOD SHINGLE WEATHER EXPOSURE AND ROOF SLOPE
	
R905.7.6 Valley flashing. Roof flashing shall be not less than No. 26 gage [0.019 inches (0.48 mm)] corrosion-resistant sheet metal and shall extend 10 inches (254 mm) from the centerline each way for roofs having slopes less than 12 units vertical in 12 units horizontal (100-percent slope), and 7 inches (178 mm) from the centerline each way for slopes of 12 units vertical in 12 units horizontal and greater. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). 
		R905.7.6 Valley flashing. Roof flashing shall be not less than No. 26 gage [0.019 inches (0.48 mm)] corrosion-resistant sheet metal and shall extend 10 inches (254 mm) from the centerline each way for roofs having slopes less than 12 units vertical in 12 units horizontal (100-percent slope), and 7 inches (178 mm) from the centerline each way for slopes of 12 units vertical in 12 units horizontal and greater. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). 
	
R905.7.7 Label required. Each bundle of shingles shall be identified by a label of an approved grading or inspection bureau or agency.		R905.7.7 Label required. Each bundle of shingles shall be identified by a label of an approved grading or inspection bureau or agency.
	
R905.8 Wood shakes. The installation of wood shakes shall comply with the provisions of this section.
		R905.8 Wood shakes. The installation of wood shakes shall comply with the provisions of this section.

R905.8.1 Deck requirements. Wood shakes shall only be used on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25.4 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Where 1-inch by 4-inch (25.4 mm by 102 mm) spaced sheathing is installed at 10 inches (254 mm) on center, additional 1-inch by 4-inch (25.4 mm by 102 mm) boards shall be installed between the sheathing boards.
		R905.8.1 Deck requirements. Wood shakes shall only be used on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25.4 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Where 1-inch by 4-inch (25.4 mm by 102 mm) spaced sheathing is installed at 10 inches (254 mm) on center, additional 1-inch by 4-inch (25.4 mm by 102 mm) boards shall be installed between the sheathing boards.
	
R905.8.1.1 Solid sheathing required. In areas where the average daily temperature in January is 25°F (-4°C) or less, solid sheathing is required on that portion of the roof requiring an ice barrier. 
		R905.8.1.1 Solid sheathing required. In areas where the average daily temperature in January is 25°F (-4°C) or less, solid sheathing is required on that portion of the roof requiring an ice barrier. 
	
R905.8.2 Deck slope. Wood shakes shall only be used on slopes of three units vertical in 12 units horizontal (25-percent slope) or greater.

		R905.8.2 Deck slope. Wood shakes shall only be used on slopes of three units vertical in 12 units horizontal (25-percent slope) or greater.
	
R905.8.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or a self-adhering polymer modified bitumen sheet, shall extend from the edge of the eave to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
		R905.8.3 Underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less, or when Table R301.2(1) criteria so designates, an ice barrier that consists of at least two layers of underlayment cemented together or a self-adhering polymer modified bitumen sheet, shall extend from the edge of the eave to a point at least 24 inches (610 mm) inside the exterior wall line of the building. Underlayment shall conform with ASTM D 226, Type I.
Exception: Detached accessory structures that contain no conditioned floor area.
	
R905.8.4 Interlayment. Interlayment shall comply with ASTM D 226, Type I.
		R905.8.4 Interlayment. Interlayment shall comply with ASTM D 226, Type I.
	
R905.8.5 Material standards. Wood shakes shall comply with the requirements of Table R905.8.5.
		R905.8.5 Material standards. Wood shakes shall comply with the requirements of Table R905.8.5.
	
TABLE R905.8.5
WOOD SHAKE MATERIAL REQUIREMENTS
		TABLE R905.8.5
WOOD SHAKE MATERIAL REQUIREMENTS
	
R905.8.6 Application. Wood shakes shall be installed according to this chapter and the manufacturer’s installation instructions. Wood shakes shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses. Spacing between shakes in the same course shall be 1/8 inch to 5/8 inch (3.2 mm to 15.9 mm) for shakes and tapersawn shakes of naturally durable wood and shall be 1/4 inch to 3/8 inch (6.4 mm to 9.5 mm) for preservative tapersawn shakes. Weather exposure for wood shakes shall not exceed those set forth in Table R905.8.6. Fasteners for wood shakes shall be corrosion-resistant, with a minimum penetration of 1/2 inch (12.7 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Wood shakes shall be attached to the roof with two fasteners per shake, positioned no more than 1 inch (25.4 mm) from each edge and no more than 2 inches (51 mm) above the exposure line.
		R905.8.6 Application. Wood shakes shall be installed according to this chapter and the manufacturer’s installation instructions. Wood shakes shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses. Spacing between shakes in the same course shall be 1/8 inch to 5/8 inch (3.2 mm to 15.9 mm) for shakes and tapersawn shakes of naturally durable wood and shall be 1/4 inch to 3/8 inch (6.4 mm to 9.5 mm) for preservative tapersawn shakes. Weather exposure for wood shakes shall not exceed those set forth in Table R905.8.6. Fasteners for wood shakes shall be corrosion-resistant, with a minimum penetration of 1/2 inch (12.7 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Wood shakes shall be attached to the roof with two fasteners per shake, positioned no more than 1 inch (25.4 mm) from each edge and no more than 2 inches (51 mm) above the exposure line.
	
TABLE R905.8.6
WOOD SHAKE WEATHER EXPOSURE AND ROOF SLOPE
		TABLE R905.8.6
WOOD SHAKE WEATHER EXPOSURE AND ROOF SLOPE
	
R905.8.7 Shake placement. The starter course at the eaves shall be doubled and the bottom layer shall be either 15-inch (381 mm), 18-inch (457 mm) or 24-inch (610 mm) wood shakes or wood shingles. Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes may be used for the final course at the ridge. Shakes shall be interlaid with 18-inch-wide (457 mm) strips of not less than No. 30 felt shingled between each course in such a manner that no felt is exposed to the weather by positioning the lower edge of each felt strip above the butt end of the shake it covers a distance equal to twice the weather exposure.
		R905.8.7 Shake placement. The starter course at the eaves shall be doubled and the bottom layer shall be either 15-inch (381 mm), 18-inch (457 mm) or 24-inch (610 mm) wood shakes or wood shingles. Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes may be used for the final course at the ridge. Shakes shall be interlaid with 18-inch-wide (457 mm) strips of not less than No. 30 felt shingled between each course in such a manner that no felt is exposed to the weather by positioning the lower edge of each felt strip above the butt end of the shake it covers a distance equal to twice the weather exposure.
	
R905.8.8 Valley flashing. Roof valley flashing shall not be less than No. 26 gage [0.019 inches (0.48 mm)] corrosion-resistant sheet metal and shall extend at least 11 inches (279 mm) from the centerline each way. Sections of flashing shall have an end lap of not less than 4 inches (102 mm).
		R905.8.8 Valley flashing. Roof valley flashing shall not be less than No. 26 gage [0.019 inches (0.48 mm)] corrosion-resistant sheet metal and shall extend at least 11 inches (279 mm) from the centerline each way. Sections of flashing shall have an end lap of not less than 4 inches (102 mm).
	
R905.8.9 Label required. Each bundle of shakes shall be identified by a label of an approved grading or inspection bureau or agency.
		R905.8.9 Label required. Each bundle of shakes shall be identified by a label of an approved grading or inspection bureau or agency.
	
R905.9 Built-up roofs. The installation of built-up roofs shall comply with the provisions of this section.

		R905.9 Built-up roofs. The installation of built-up roofs shall comply with the provisions of this section.
	
R905.9.1 Slope. Built-up roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage, except for coal-tar built-up roofs, which shall have a design slope of a minimum one-eighth unit vertical in 12 units horizontal (1-percent slope).
		R905.9.1 Slope. Built-up roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage, except for coal-tar built-up roofs, which shall have a design slope of a minimum one-eighth unit vertical in 12 units horizontal (1-percent slope).
	
R905.9.2 Material standards. Built-up roof covering materials shall comply with the standards in Table R905.9.2.
	Mod 685  (New section)

1508.3.3 Red rosin paper shall be used when the membrane is applied directly to a wood deck or cementitious fiber decks.
	R905.9.2 Material standards. Built-up roof covering materials shall comply with the standards in Table R905.9.2.
R905.9.X  Red rosin paper shall be used when the membrane is applied directly to a wood deck or cementitious fiber decks.
	
R905.9.3 Application. Built-up roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
		R905.9.3 Application. Built-up roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
	
R905.10 Metal roof panels. The installation of metal roof panels shall comply with the provisions of this section.
		R905.10 Metal roof panels. The installation of metal roof panels shall comply with the provisions of this section.
	
R905.10.1 Deck requirements. Metal roof panel roof coverings shall be applied to a solid or spaced sheathing, except where the roof covering is specifically designed to be applied to spaced supports.
		R905.10.1 Deck requirements. Metal roof panel roof coverings shall be applied to a solid or spaced sheathing, except where the roof covering is specifically designed to be applied to spaced supports.
	
R905.10.2 Slope. The minimum slope for lapped, nonsoldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope). The minimum slope for lapped, nonsoldered seam metal roofs with applied lap sealant shall be one-half vertical unit in 12 units horizontal (4-percent slope). The minimum slope for standing seam roof systems shall be one-fourth unit vertical in 12 units horizontal (2-percent slope).
	Mod 607  (New section)

1507.5.2.1  Underlayment shall be installed as per manufacturer’s installation guidelines.
	R905.10.2 Slope. The minimum slope for lapped, nonsoldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope). The minimum slope for lapped, nonsoldered seam metal roofs with applied lap sealant shall be one-half vertical unit in 12 units horizontal (4-percent slope). The minimum slope for standing seam roof systems shall be one-fourth unit vertical in 12 units horizontal (2-percent slope).

R905.10.2.1 Underlayment shall be installed as per manufacturer’s installation guidelines.

R905.10.3 Material standards. Metal-sheet roof covering systems that incorporate supporting structural members shall be designed in accordance with the International Building Code. Metal-sheet roof coverings installed over structural decking shall comply with Table R905.10.3.
		R905.10.3 Material standards. Metal-sheet roof covering systems that incorporate supporting structural members shall be designed in accordance with the International Florida Building Code. Metal-sheet roof coverings installed over structural decking shall comply with Table R905.10.3.
	
TABLE R905.9.2
BUILT-UP ROOFING MATERIAL STANDARDS
		TABLE R905.9.2
BUILT-UP ROOFING MATERIAL STANDARDS
	
TABLE R905.10.3
METAL ROOF COVERINGS STANDARDS AND INSTALLATION
	Mod 621  (In IRC)

Aluminum-zinc alloy coated steel ASTM A 792  (AZ 50 coated)

TABLE 1507.5.3
METAL ROOF COVERINGS
ROOF COVERING TYPE	
MINIMUM APPLICATION RATE

Galvanized steel			ASTM A 653 G-90 zinc coated
Prepainted steel			ASTM A 755
Aluminum-zinc alloy coated steel	ASTM A 792 (AZ 50 coated minimum application rate.) 
Lead-coated copper			ASTM B 101
Copper					16 oz per sq ft (4.9 kg/m2)
Hard lead				2 lb per sq ft (9.8 kg/m2)
Soft lead				8 lb per sq ft (14.6 kg/m2)
Aluminum				ASTM B 209
Terne (tin) and terne coated stainless
Terne Coating of 40 lb (18 kg) per double base box, field painted where applicable in accordance with manufacturer’s installation instructions.	TABLE R905.10.3
METAL ROOF COVERINGS STANDARDS AND INSTALLATION

(Note:  Few cosmetic changes to Table)	
R905.10.4 Attachment. Metal roofing shall be installed in accordance with this chapter and the manufacturer’s installation instructions. Metal roofing fastened directly to steel framing shall be attached by approved fasteners. The following fasteners shall be used:
1.	Galvanized fasteners shall be used for galvanized roofs.
2.	Three hundred series stainless steel fasteners shall be used for copper roofs.
3.	Stainless steel fasteners are acceptable for metal roofs.
	Mod 684

1507.5.4 Attachment.  Metal roofing shall be secured in accordance with manufacturer’s installation instruction.  In the absence of manufacturer’s recommendations, the following fasteners shall be used:
1.	1.  Galvanized fasteners shall be used for galvanized roofs.
2.	Hard copper or copper alloy shall be used for copper roofs.
3.	Aluminum-zinc coated fasteners are acceptable for aluminum-zinc coated roofs.
4.	Stainless steel fasteners are acceptable for all metal roofs.

Mod 622

1508.4.4 Attachment.  Metal roofing shall be secured in accordance with manufacturer’s installation instruction.  In the absence of manufacturer’s recommendations, the following fasteners shall be used:
1.	1.  Galvanized fasteners shall be used for galvanized roofs.
2.	 Hard copper or copper alloy shall be used for copper roofs.
3.	3.  Aluminum-zinc coated steel fasteners are acceptable for aluminum-zinc steel coated roofs.
4.	Stainless steel fasteners are acceptable for all metal roofs.
	R905.10.4 Attachment. Metal roofing shall be installed in accordance with this chapter and the manufacturer’s installation instructions. Metal roofing fastened directly to steel framing shall be attached by approved fasteners. The following fasteners shall be used:
1.	Galvanized fasteners shall be used for galvanized roofs.
2.	Hard copper or copper alloy shall be used for copper roofs. or T three hundred series stainless steel fasteners shall be used for copper roofs.
3.  Aluminum-zinc coated fasteners are acceptable for aluminum-zinc coated roofs.
3.	4. Stainless steel fasteners are acceptable for metal roofs.
	
R905.11 Modified bitumen roofing. The installation of modified bitumen roofing shall comply with the provisions of this section.
		R905.11 Modified bitumen roofing. The installation of modified bitumen roofing shall comply with the provisions of this section.
	
R905.11.1 Slope. Modified bitumen membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
		R905.11.1 Slope. Modified bitumen membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
	
R905.11.2 Material standards. Modified bitumen roof coverings shall comply with the standards in Table R905.11.2.
		R905.11.2 Material standards. Modified bitumen roof coverings shall comply with the standards in Table R905.11.2.
	
TABLE R905.11.2
MODIFIED BITUMEN ROOFING MATERIAL STANDARDS
	Mod 198

1508.5.2 Material standards. Modified bitumen roof coverings shall comply with CGSB 37-GP-56M, ASTM D 6162, ASTM D 6163, or ASTM D 6164, ASTM D 6222, ASTM D 6223, and ASTM D6298.	TABLE R905.11.2
MODIFIED BITUMEN ROOFING MATERIAL STANDARDS

(No change necessary.  Table includes all standards).	
R905.11.3 Application. Modified bitumen roofs shall be installed according to this chapter and the manufacturer’s installation instructions.		R905.11.3 Application. Modified bitumen roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
	
R905.12 Thermoset single-ply roofing. The installation of thermoset single-ply roofing shall comply with the provisions of this section.
		R905.12 Thermoset single-ply roofing. The installation of thermoset single-ply roofing shall comply with the provisions of this section.
	
R905.12.1 Slope. Thermoset single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
		R905.12.1 Slope. Thermoset single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
	
R905.12.2 Materials standards. Thermoset single-ply roof coverings shall comply with RMA RP-1, RP-2 or RP-3, or ASTM D 4637, ASTM D 5019 or CGSB 37-52M.
		R905.12.2 Materials standards. Thermoset single-ply roof coverings shall comply with RMA RP-1, RP-2 or RP-3, or ASTM D 4637, ASTM D 5019 or CGSB 37-52M.
	
R905.12.3 Application. Thermoset single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
		R905.12.3 Application. Thermoset single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions.

R905.13 Thermoplastic single-ply roofing. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section.
		R905.13 Thermoplastic single-ply roofing. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section.
	
R905.13.1 Slope. Thermoplastic single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).
		R905.13.1 Slope. Thermoplastic single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).
	
R905.13.2 Material standards. Thermoplastic single-ply roof coverings shall comply with ASTM D 4434 or CGSB 37-54M.
		R905.13.2 Material standards. Thermoplastic single-ply roof coverings shall comply with ASTM D 4434 or CGSB 37-54M.
	
R905.13.3 Application. Thermoplastic single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
		R905.13.3 Application. Thermoplastic single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
	
R905.14 Sprayed polyurethane foam roofing. The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section.
		R905.14 Sprayed polyurethane foam roofing. The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section.
	
R905.14.1 Slope. Sprayed polyurethane foam roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
		R905.14.1 Slope. Sprayed polyurethane foam roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.

R905.14.2 Material standards. Spray-applied polyurethane-foam insulation shall comply with ASTM C 1029.
		R905.14.2 Material standards. Spray-applied polyurethane-foam insulation shall comply with ASTM C 1029.
	
R905.14.3 Application. Foamed in place roof insulation shall be installed in accordance with this chapter and the manufacturer’s installation instructions. A liquid-applied protective coating that complies with Section R905.15 shall be applied no less than 2 hours nor more than 72 hours following the application of the foam.
		R905.14.3 Application. Foamed in place roof insulation shall be installed in accordance with this chapter and the manufacturer’s installation instructions. A liquid-applied protective coating that complies with Section R905.15 shall be applied no less than 2 hours nor more than 72 hours following the application of the foam.
	
R905.14.4 Foam plastics. Foam plastic materials and installation shall comply with Section R314.
		R905.14.4 Foam plastics. Foam plastic materials and installation shall comply with Section R314.
	
R905.15 Liquid-applied coatings. The installation of liquid-applied coatings shall comply with the provisions of this section.
		R905.15 Liquid-applied coatings. The installation of liquid-applied coatings shall comply with the provisions of this section.
	
R905.15.1 Slope. Liquid-applied roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).
		R905.15.1 Slope. Liquid-applied roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).

R905.15.2 Material standards. Liquid-applied roof coatings shall comply with ASTM C 836, C 957, D 1227, D 3468 or D 6083.
	Mod 629

1508.9.2  Material standards.  Liquid-applied roof coatings shall comply with ASTM C 836, ASTM C 957, ASTM D 1227 or ASTM D 3468 or ASTM D 6083.
	R905.15.2 Material standards. Liquid-applied roof coatings shall comply with ASTM C 836, C 957, D 1227, D 3468 or D 6083.

(No change necessary)	
R905.15.2 Material standards. Liquid-applied roof coatings shall comply with ASTM C 836, C 957, D 1227, D 3468 or D 6083.
		R905.15.2 Material standards. Liquid-applied roof coatings shall comply with ASTM C 836, C 957, D 1227, D 3468 or D 6083.	
SECTION R906
ROOF INSULATION
		SECTION R906
ROOF INSULATION
	
R906.1 General. The use of above deck thermal insulation shall be permitted provided such insulation is covered with an approved roof covering and passes FM 4450 or UL 1256.

		R906.1 General. The use of above deck thermal insulation shall be permitted provided such insulation is covered with an approved roof covering and passes FM 4450 or UL 1256.

SECTION R907
REROOFING
		SECTION R907
REROOFING
	
R907.1 General. Materials and methods of application used for recovering or replacing an existing roof covering shall comply with the requirements of Chapter 9.
Exception: Reroofing shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2-percent slope) in Section 905 for roofs that provide positive roof drainage.
		R907.1 General. Materials and methods of application used for recovering or replacing an existing roof covering shall comply with the requirements of Chapter 9.
Exception: Reroofing shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2-percent slope) in Section 905 for roofs that provide positive roof drainage.
	
R907.2 Structural and construction loads. The structural roof components shall be capable of supporting the roof covering system and the material and equipment loads that will be encountered during installation of the roof covering system.
		R907.2 Structural and construction loads.  The structural roof components shall be capable of supporting the roof covering system and the material and equipment loads that will be encountered during installation of the roof covering system.
	
R907.3 Recovering versus replacement. New roof coverings shall not be installed without first removing existing roof coverings where any of the following conditions occur:
1.	Where the existing roof or roof covering is water-soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing.
2.	Where the existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile.
3.	Where the existing roof has two or more applications of any type of roof covering.

Exceptions: 
1.	Complete and separate roofing systems, such as standing-seam metal roof systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings.
2.	Metal panel, metal shingle, and concrete and clay tile roof coverings shall be permitted to be installed over existing wood shake roofs when applied in accordance with Section R907.4.
	Mod 631  

1510.3 Recovering vs replacement.  New roof coverings shall not be installed without first removing existing roof coverings where any of the following conditions occur.

1.	When the old roofing is water-soaked or deteriorated to the point that it is not suitable as a base for additional roofing.
2.	When blisters exist in any roofing, unless blisters are cut or scraped open and nailed remaining materials secured down before applying additional roofing.
3.	When the existing roof surface is gravel or the like, unless the gravel shall be thoroughly removed or all loose gravel removed and approved base material installed before applying additional roofing.
4.	When existing roof is slate or the like.
5.	When sheathing or supports are deteriorated to the point that the roof structural system is not substantial enough to support recovering.
6.	When existing roof has two or more applications of any type roofing material.  Conformance with this item shall make replacement mandatory.
	R907.3 Recovering versus replacement. New roof coverings shall not be installed without first removing existing roof coverings where any of the following conditions occur:
1.	Where the existing roof or roof covering is water-soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing.
2.	Where the existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile.
3.	Where the existing roof has two or more applications of any type of roof covering.
	
When blisters exist in any roofing, unless blisters are cut or scraped open and nailed remaining materials secured down before applying additional roofing.

Exceptions: 
1.	Complete and separate roofing systems, such as standing-seam metal roof systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings.
2.	Metal panel, metal shingle, and concrete and clay tile roof coverings shall be permitted to be installed over existing wood shake roofs when applied in accordance with Section R907.4.
	
R907.4 Roof recovering. Where the application of a new roof covering over wood shingle or shake roofs creates a combustible concealed space, the entire existing surface shall be covered with gypsum board, mineral fiber, glass fiber or other approved materials securely fastened in place.
		R907.4 Roof recovering. Where the application of a new roof covering over wood shingle or shake roofs creates a combustible concealed space, the entire existing surface shall be covered with gypsum board, mineral fiber, glass fiber or other approved materials securely fastened in place.
	
R907.5 Reinstallation of materials. Existing slate, clay or cement tile shall be permitted for reinstallation, except that damaged, cracked or broken slate or tile shall not be reinstalled. Existing vent flashing, metal edgings, drain outlets, collars and metal counter flashings shall not be reinstalled where rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reinstalled.
		R907.5 Reinstallation of materials. Existing slate, clay or cement tile shall be permitted for reinstallation, except that damaged, cracked or broken slate or tile shall not be reinstalled. Existing vent flashing, metal edgings, drain outlets, collars and metal counter flashings shall not be reinstalled where rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reinstalled.
	
R907.6 Flashings. Flashings shall be reconstructed in accordance with approved manufacturer’s installation instructions. Metal flashing to which bituminous materials are to be adhered shall be primed prior to installation.
		R907.6 Flashings. Flashings shall be reconstructed in accordance with approved manufacturer’s installation instructions. Metal flashing to which bituminous materials are to be adhered shall be primed prior to installation.