Staff Analysis for

Declaratory Statement Request DS2014-002

January 16, 2014

 

Issue: DS2014-002. The Petitioner, Gulf Coast Supply and Manufacturing, LLC (Ray Bowen), seeks a Declaratory Statement on Chapter 15, sections 1503.1, 1503.2.1 and 1507.4 and Tables 1503.2 and 1507.4.3(1) of the 2010 Florida Building Code, Building.

 

Petitioner in DS2014-002 seeks clarification of the following questions:

Question 1: Does Table 1503.2 set forth the minimum thickness requirements, flashings used on metal roof systems, even though thinner metal roofing panels are acceptable per Table 1507.4.3(1)?

Question 2: Do what we in the industry call “Trims” (eave drips, wall trims, ridge caps, preformed valleys, etc.) qualify as flashings, seeing they are always installed at the locations listed in 1503.2.1

 

Background:

 

Situation:

 

Gulf Coast Supply and Manufacturing, LLC is a leading manufacturer of metal roofing systems in Florida, with over 30 different product approval including FPA #1165.25.  Gulf Coast Supply “Manufacturer” has four manufacturing locations in Florida, and sells directly to hundreds of state certified roofers from Key West to Jacksonville to the Gulf Coast and west to Panama City. The Manufacturer supplies hundreds of roofing packages per week, primarily for residential applications. The roofing packages contain metal roofing panels (which are tested as part of the approval), and flashings (which are not tested as part of the approval. 

 

The Manufacturer has a question about the requirements of Chapter 15 of the Florida Building Code.  The Code requires that the minimum thickness of metal roofing panels be in accordance with table 1507.4.3(1), which requires Aluminum Zinc Coated Steel Panels to be at least .013” thick.  However, there is nothing in section 1507.4 that specifies minimum thicknesses for flashings that are used on metal roofs.  There is, however, a table in the beginning of Chapter 15 that addresses the subject (Table 1503.2), and according to that table the minimum thickness for Aluminum Zinc Coated Steel Flashings is .0179”.

 

Specifically: “The Code requires that the minimum thickness of metal roofing panels be in accordance with table 1507.4.3(1), which requires Aluminum Zinc Coated Steel panels to be at least .013” thick.  However, there is nothing in section 1507.4 that specifies minimum thicknesses for flashings that are used on metal roofs.  There is, however, a table in the beginning of Chapter 15 that addresses the subject (Table 1503.2), and according to that table the minimum thickness for Aluminum Zinc Coated Steel Flashings is .0179”.”

 

 

Relevant Code Sections

 

SECTION 1503 WEATHER PROTECTION

 

1503.2 Flashing.  Flashing 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.

 

 

1503.2.1 Locations. Flashing shall be installed at wall and roof intersections, at gutters, 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 not less than provided in Table 1503.2.

Exception: This requirement does not apply to hip and ridge junctions.

 

 

 

TABLE 1503.2

METAL FLASHING MATERIAL

 

Material

MINIMUM

THICKNESS

(INCHES)

GAGE

WEIGHT (LBS

PER SQ FT)

Copper

 

 

1 (16oz)

Aluminum

0.024

 

 

Stainless Steel

 

28

 

Galvanized Steel

0.0179

26 (zinc coated G90)

 

Aluminum Zinc Coated Steel

0.0179

26 (AZ50 Alum Zinc)

 

Zinc Alloy

1.027

 

 

Lead

 

 

2.5 (40 oz)

Painted Terne

--

 

1.25 (20 oz)

 

 

 

 

1507.4

1507.4.3(1)

1507.4 Metal roof panels. The installation of metal roof panels shall comply with the provisions of this section.

1507.4.1 Deck requirements. Metal roof panel roof coverings shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced supports.

 

TABLE 1507.4.3(1)

METAL ROOF COVERINGS

ROOF COVERING TYPE

STANDARD

STANDARD APPLICATION

RATE/THICKNESS

Aluminum

ASTM B 209

0.024 inch minimum thickness for roll-formed panels and 0.019 inch minimum thickness for press-formed shingles

Aluminum-zinc coated steel

ASTM A 792

0.013 inch minimum thinkness,

AZ 50 (coated minium application rate)

Cold-rolled copper

ASTM B 370

Minimum 16oz/sq.ft. and 12 oz./sq.ft. high yield copper for metal-sheet roof covering systems: 12 oz/sq.ft. for preformed metal shingle systems.

Galvanized steel

ASTM 653

0.013 inch minimum thickness,

G-90 zinc-coated.

Hard lead

 

2 lbs./sq.ft.

Lead-coated copper

ASTM B 101

 

Prepainted steel

ASTM A 755

 

Soft lead

 

3 lbs./sq.ft.

Stainless Steel

ASTM A 240

300 Series Alloys

Steel

ASTM A 924/ ASTM A 924M

 

Terne and Terne-coated stainless

 

Terne coating of 40 lbs. per double base box, filed painted where applicable n accordance with manufacturer’s installation instructions.

Zinc:

 

0.027 inch minimum thickness; 99.995% electrolytic high grade zinc with alloy additives of copper (3.08% - 0.20%), titanium (0.07% - 0.12%) and aluminum (0.015%)

For SI: 1 ounce per square foot = 1.0026 kg/m2, 1 pound per square foot = 4.882 kg/m2, 1 inch = 25.4 mm, 1 pound = 0.454 kg.

a.For Group U buildings, the minimum coating thickness for ASTM A 653 galvanize steel roofing shall be G-60.

 

 

TRIMS

FBC, Building

Section: 802.1

TRIM. Picture molds, chair rails, baseboards, handrails, door and window frames and similar decorative or protective materials used in fixed applications.

FLASHING. The roofing component used to seal roofing systems, where the system is interrupted or terminated.

 

Staff Analysis:  Based on the above facts and circumstances, staff provides the following answers to proponent’s questions:

 

Question #1:

To the question #1: Does Table 1503.2 set forth the minimum thickness requirements flashings used on metal roof systems, even though thinner metal roofing panels are acceptable per Table 1507.4(3)?

 

Answer:  Yes.  Table 1503.2 is specific to the type and gage of flashing that it is be utilized and does not differentiate based on types of roof covering to be used.

Question #2:

To the question #2: Do what we in the industry call “Trims” (eve drips, wall trims, ridge caps, preformed valleys, etc.) qualify as flashings, seeing they are always installed at the locations listed in 1503.2.1?

Answer:  Yes.  As long as the items in question are covered within scope of section 1503.2 of the 2010 Florida Building Code, Building.