2018 International Residential Code – Roofing

Roofing TAC 

IRC-Roofing Code Change No.	IRC-Roofing Section	Change Summary b/t 2015 IRC-R and 2018 IRC-R	Change Summary b/t 2017 IRC-R and 2018 IRC-R	Staff comments	
S8-16 Part II	R905.2.4.1	Revises to make an editorial clarification that aligns the labeling requirement for the wind standards for asphalt shingles to provide consistent labeling requirements between the IRC and IBC.

Cost Impact: Will not increase the cost of construction.
The proposal is editorial and adds no new requirements	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
     TAC Action

     Accommodate Florida Specific Need:
     YES (Select Criteria)                                                     NO: 

 

     a.  b.  c.      d.  e.  f. 

     Others (Explain):	Commission Action

Accommodate Florida Specific Need:

YES (Select Criteria)                                                               NO: 

 

a.  b.  c.      d.  e.  f. 
Others (Explain):	
    	
TAC	
Cmsn.	

       No Action Needed 	

	

	

  Overlapping provisions     	

X

	

	

	
S18-16 Part II	1504.7, 1507.11.2, 1507.12.2, 1507.13.2	Revised to remove withdrawn Canadian Standards.

Cost Impact: Will not increase the cost of construction.
The referenced standards have been withdrawn and are invalid.	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
S28-16 Part II	R905.1.1	Modifies text of Section R905.1.1 “Underlayment”. The proposal adds a requirement that self-adhering underlayments bear
a label to demonstrate compliance to the code. The proposal also adds photovoltaic shingles to the list of roof covering materials requiring labeled underlayment materials in the IRC.

Cost Impact: Will increase the cost of construction.
Will require products bear a label, which will add product approval costs. The IRC already contains an underlayment labeling requirement, so the cost impact is expected to be minimal.
	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
S43-16 Part II	R905.11.1, R905.11.2, R905.11.2.1 (New)	Revised to include a change to terminology for modified bitumen roofing materials for consistency with referenced standards and industry terminology. In addition, it includes a new section permitting the use of base sheet materials that comply with
ASTM D 1970, ASTM D4601, or other standards as applicable.

Cost Impact: Will not increase the cost of construction.

The proposal increases product options.	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
S51-16 Part II	R202 (New), R908.3.1	Revised to clarify the enforcement process by adding additional substrates (i.e., existing roof coverings) that are acceptable for the installation of a roof coating.  The code change was further modified by the Committee. The modification corrects an error in the definition. 

Cost Impact: Will not increase the cost of construction
This will likely reduce the cost of construction when questions are raised about the appropriate use of a roof coating on existing
roofs.
	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB154-16	R317.1, R402.1.2, R504.3, R905.8.5	Modifies text of Section R317.1 “Location required”, R402.1.2 “Wood treatment”, R504.3 “Materials”, TABLE R905.8.5
“WOOD SHAKE MATERIAL REQUIREMENTS”. The existing text was outdated, requiring clarification and updates to current AWPA section numbering.

Cost Impact: Will not increase the cost of construction.
	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB164-16	R324.3, R324.3.1, R324.4, R324.4.1, R324.5, R324.5.1, R324.5.2 (New), R907, R907.1,
R907.2, R907.3, R907.4, R907.5, R909, R909.1, R909.2, R909.3	Modifies Sections R324.3 “Photovoltaic systems”, R324.3.1 “Equipment listings”, R324.4 “Rooftop-mounted photovoltaic systems”, R324.4.1 “Structural requirements”, R324.4.1.1 “Roof live load”, R324.4.1.2 “Wind resistance”, R324.4.2 “Fire classification”, R324.4.3 “Roof penetrations”, R324.5 “Building-integrated photovoltaic systems”, R324.5.1 “Photovoltaic shingles”, Section R907 “ROOFTOP-MOUNTED PHOTOVOLTAIC PANEL SYSTEMS”. Adds new Section R324.5.2 “Fire classification”. 

Deletes Section R907.4 “Installation”, R907.5 “Photovoltaic panels and modules”, SECTION R909 “ROOFTOP-MOUNTED PHOTOVOLTAIC PANEL SYSTEMS”.

The intent of this proposal is to address redundant code requirements and consolidate/reorganize requirements that were also included in Chapter 9 during the last code cycle. These changes will help to address any confusion regarding the installation of photovoltaic systems.

Cost Impact: Will not increase the cost of construction. The proposal clarifies the applicable requirements for photovoltaic systems.
	Same as change between 2015 IRC-B and 2018 IRC-B	OVERLAPPING	
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB165-16	R324.4.1	Revises text of section R324.4.1 “Roof live load”. This proposal is intended to clarify and correct the requirements for design loads for roofs with PV panels. The current code text is confusing, incomplete, and technically incorrect.

Cost Impact: Will not increase the cost of construction. This proposal merely clarifies how loads are to be applied to the roof structure. Properly-designed roof structures should have been using the load cases in this proposal, so no change in cost or construction is anticipated.
	Same as change between 2015 IRC-B and 2018 IRC-B		
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

X

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

	

	

	

	
RB172-16	R202 (New), R401.4, R801.3	Modifies text of Section R401.4 “Soil tests” and R801.3 “Roof drainage”.  Adds Definitions “COLLAPSIBLE SOILS”, “COMPRESSIBLE SOILS”, EXPANSIVE SOILS”. There is currently no definition for collapsible soils to provide guidance to design professionals and building officials on identification
and design procedures to address these soils. These terms are used in IRC Section R401.4 and R801.3.

Cost Impact: Will not increase the cost of construction.
	Same as change between 2015 IRC-B and 2018 IRC-B		
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

X

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

	

	

	

	
RB339-16	R902.4	Modifies text of Section R902.4 “Rooftop-mounted photovoltaic panel systems”. Adds new standard “UL 2703-14, Mounting Systems, Mounting Devices, Clamping/Retention Devices, and Ground Lugs for Use with Flat-Plate Photovoltaic Modules and Panels”. This proposal aligns the IRC requirements with IBC Section 1505.9 for fire classification of photovoltaic panel systems.  The code change was further modified by the Committee. The modification is an editorial correction for the term photovoltaic panel systems.

Cost Impact: Will not increase the cost of construction. This code change simply provides the appropriate method for testing photovoltaic panel systems for fire classification, as required by the ANSI standards. This method is already in use within the industry therefore there is no additional cost to construction
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB341-16	R905.1.1	Modifies text of Section R905.1.1 “Underlayment”. This proposal simply adds an additional method for preventing water penetration when the primary roof covering is lost due to high winds.  The code change was further modified by the Committee.  The modification adds another acceptable type of ASTM D4869 that provides another option.

Cost Impact: Will not increase the cost of construction.
The proposed criteria is optional.
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB343-16	R905.1.1, R905.16.3, R905.16.4, R905.16.4.1, R905.16.4.2	Revises TABLE R905.1.1 (1) “UNDERLAYMENT TYPES”, TABLE R905.1.1 (2) “UNDERLAYMENT APPLICATION”, TABLE R905.1.1 (3) “UNDERLAYMENT ATTACHMENT”. Modifies text of Section R905.16.3 “Underlayment” and R905.16.3.1 “Ice barrier.” Deletes Section R905.16.4 “Underlayment application” and R905.16.4.2 “Underlayment and high winds”. 

This proposal is primarily a clarification regarding the lapping requirements for underlayment and brings the underlayment requirements for PV shingles in line with other roof covering types.  The code change was further modified by the Committee.
The modification adds another acceptable type of ASTM D4869 that provides another option.

Cost Impact: Will increase the cost of construction. Will increase the cost of construction Will result in a cost increase for PV shingles in some areas. The wind speed trigger for the enhanced underlayment provisions has been slightly lowered resulting in it applying to more areas where PV shingles are installed. Underlayment provisions for PV shingles will be aligned with other roof covering types.
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB345-16	R905.15.3	Modifies text of Section R905.15.3 “Application”. The proposal adds necessary language so that the application of roof coatings follows manufacturer's approved installation instructions.

Cost Impact: Will not increase the cost of construction.
The proposal adds clarity and does not change code requirements.
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB351-16	R202 (New), R324.5.2 (New), R905.17 (New), R905.17.1 (New), R905.17.2 (New), R905.17.3
(New), R905.17.3.1 (New), R905.17.4 (New), R905.17.5 (New), R905.17.6 (New), R905.17.7 (New), UL
(New)	Adds a new definition “BUILDING-INTEGRATED PHOTOVOLTAIC ROOF PANEL (BIPV Roof Panel).” Adds new Sections R324.5.2 “BIPV roof panels”, R905.17 “BIPV roof panels applied directly to the roof deck”, R905.17.1 “Deck requirements”, R905.17.2 “Deck slope”, R905.17.3 “Underlayment”, R905.17.3.1 “Ice barrier”, R905.17.5 “Material standards”, R905.17.6 “Attachment”, R905.17.7 “Wind resistance”. Adds new standard “UL 1897-12 Uplift Tests for Roof Covering System”.

This proposal adds new sections to the IRC to address Building-integrated (BIPV) roof panels. These products form part of
the roof assembly and are subject to the same requirements as any other roof covering.

The code change was further modified by the Committee.  The modification clarifies the underlayment requirements and adds
reference to the proper code sections.

Cost Impact: Will not increase the cost of construction. This proposal does not increase the cost of construction. It adds another type of roof covering, enhancing builder choices.
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB352-16	R906.2	Modifies TABLE R906.2 “MATERIAL STANDARDS FOR ROOF INSULATION”. Adds new standard ASTM C726-12 “Standard Specification for Mineral Wool Roof Insulation Board”. This proposal will add reference to the appropriate ASTM Standard specification for mineral wool roof insulation and make
Table R906.2 consistent with IBC Table 1508.2.  The code change was further modified by the Committee.  The  modification adds the clarification that it applies to the installation also.

Cost Impact: Will not increase the cost of construction. This proposal does not add to the cost of construction because it provides an additional, non-mandatory, alternative material that may or may not be used in these applications at the discretion of the user.
	Same as change between 2015 IRC-B and 2018 IRC-B		
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

X

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

	

	

	

	
RB354-16	R907.2	Modifies text of Section R324.4.2 “Wind load”. This proposal places the requirement for PV panel wind design in the same location as the other design load requirements

Cost Impact: Will not increase the cost of construction.
This proposal only moves a requirement and provides clarification and does not result in a change of design or construction
	This change is not similar to that of the FRC. The FRC provides for Florida specific changes to this section	Overlapping provision to be considered during step 2 of the code change process  

RCCIWG – Comment

Impactful (Explain) 

	TAC Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

X

	

	

	
RB371-16	U103, U103.1, U103.2, U103.3, U103.4, U103.5, U103.5 (New), U103.6, U103.6 (New),
U103.7, U103.8	Modifies text of Section U103.1 “General”, U103.7 “Roof load documentation”, U103.8 “Interconnection pathway”, U103.9 “Electrical service reserved space”, U103.10 “Construction documentation certificate”.  Adds new Section U103.5 “Shading” and U103.6 “Capped roof penetration sleeve”. The modifications proposed are designed to provide clarification and strengthen the existing Solar-ready Appendix U.

Cost Impact: Will increase the cost of construction. Only in roofs with a slope of 2:12 or less will this proposal increase the cost of construction by $100. In all other projects it will not
increase the cost of construction.
	Same as change between 2015 IRC-B and 2018 IRC-B		
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

X

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions     	

	

	

	

	
G14-16 Part IV	IRC: 202	Revises section 202 definition “[BS] Roof assembly” to clarify and make corrections in the definition.  The code change was further modified by the Committee.  The modification removes unnecessary language. The updates to the language improve the code.    

Cost Impact: Will not increase the cost of construction. This is a clarification of a definition and does not add any additional restrictions or requirements.	Same as change between 2015 IBC and 2018 IBC		
RCCIWG – Comment

Impactful (Explain) 

	TAC Action

X

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):	Commission Action

Accommodate Florida Specific Need:
YES (Select Criteria)                                   NO: 

 

a.  b.  c.      d.  e.  f. 

Others (Explain):		
TAC	
Commission	

    No Action Needed	

	

	

 Overlapping provisions