Proposed Change 679

679
Last modified: 2013-11-01
Code Reference(s):
NBC10 Div.B 9.26.2.1.
Subject:
Roofing, Dampproofing and Waterproofing Standards
Title:
9.26.2.1 - Add/delete Roofing Material Standards
Description:
This proposed change removes reference to those CGSB standards that have been withdrawn or are obsolete. It also clarifies which standards apply to specific materials or roofing components/accessories.

EXISTING PROVISION

9.26.2.1.Material Standards

1)Roofing materials shall conform to
a)CAN/CGSB-37.4-M, "Fibrated, Cutback Asphalt, Lap Cement for Asphalt Roofing",
b)CAN/CGSB-37.5-M, "Cutback Asphalt Plastic, Cement",
c)CAN/CGSB-37.8-M, "Asphalt, Cutback, Filled, for Roof Coating",
d)CGSB 37-GP-9Ma, "Primer, Asphalt, Unfilled, for Asphalt Roofing, Dampproofing and Waterproofing",
e)CGSB 37-GP-21M, "Tar, Cutback, Fibrated, for Roof Coating",
f)CAN/CGSB-37.50-M, "Hot-Applied, Rubberized Asphalt for Roofing and Waterproofing",
g)CGSB 37-GP-52M, "Roofing and Waterproofing Membrane, Sheet Applied, Elastomeric",
h)CAN/CGSB-37.54, "Polyvinyl Chloride Roofing and Waterproofing Membrane",
i)CGSB 37-GP-56M, "Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing",
j)CGSB 41-GP-6M, "Sheets, Thermosetting Polyester Plastics, Glass Fiber Reinforced",
k)CAN/CGSB-51.32-M, "Sheathing, Membrane, Breather Type",
l) , "",
m)CAN/CSA-A123.2, "Asphalt-Coated Roofing Sheets",
n)CSA A123.3, "Asphalt Saturated Organic Roofing Felt",
o)CAN/CSA-A123.4, "Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems",
p)CSA A123.17, "Asphalt Glass Felt Used in Roofing and Waterproofing",
q)CAN/CSA-A220.0, "Performance of Concrete Roof Tiles",
r)CSA O118.1, "Western Red Cedar Shakes and Shingles", or
s)CSA O118.2, "Eastern White Cedar Shingles".

PROPOSED CHANGE

[9.26.2.1.] 9.26.2.1.Material Standards

[1] 1)Where materials used for the preparation of the substrate for roofing are covered in the scope of a standard listed in Table 9.26.2.1.A., they Roofing materials shall conform to that standard.
[a] a)CAN/CGSB-37.4-M, "Fibrated, Cutback Asphalt, Lap Cement for Asphalt Roofing",
[b] b)CAN/CGSB-37.5-M, "Cutback Asphalt Plastic, Cement",
[c] c)CAN/CGSB-37.8-M, "Asphalt, Cutback, Filled, for Roof Coating",
[d] d)CGSB 37-GP-9Ma, "Primer, Asphalt, Unfilled, for Asphalt Roofing, Dampproofing and Waterproofing",
[e] e)CGSB 37-GP-21M, "Tar, Cutback, Fibrated, for Roof Coating",
[f] f)CAN/CGSB-37.50-M, "Hot-Applied, Rubberized Asphalt for Roofing and Waterproofing",
[g] g)CGSB 37-GP-52M, "Roofing and Waterproofing Membrane, Sheet Applied, Elastomeric",
[h] h)CAN/CGSB-37.54, "Polyvinyl Chloride Roofing and Waterproofing Membrane",
[i] i)CGSB 37-GP-56M, "Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing",
[j] j)CGSB 41-GP-6M, "Sheets, Thermosetting Polyester Plastics, Glass Fiber Reinforced",
[k] k)CAN/CGSB-51.32-M, "Sheathing, Membrane, Breather Type",
[l] l) , "",
[m] m)CAN/CSA-A123.2, "Asphalt-Coated Roofing Sheets",
[n] n)CSA A123.3, "Asphalt Saturated Organic Roofing Felt",
[o] o)CAN/CSA-A123.4, "Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems",
[p] p)CSA A123.17, "Asphalt Glass Felt Used in Roofing and Waterproofing",
[q] q)CAN/CSA-A220.0, "Performance of Concrete Roof Tiles",
[r] r)CSA O118.1, "Western Red Cedar Shakes and Shingles", or
[s] s)CSA O118.2, "Eastern White Cedar Shingles".
Table [9.26.2.1.A]
Materials for Preparation of the Substrate for Roofing
Type of Material Referenced Standards
Sheathing Membranes CAN/CGSB-51.32-M, Sheathing, Membrane, Breather Type
Primers CGSB 37-GP-9Ma, Primer, Asphalt, Unfilled, for Asphalt Roofing, Dampproofing and Waterproofing
[2] --)Where roofing materials are covered in the scope of a standard listed in Table 9.26.2.1.B., they shall conform to that standard.
Table [9.26.2.1.B]
Roofing Materials
Roof Coverings Referenced Standards
Built-up roofing (BUR) ASTM D 3019, Lap Cement Used with Asphalt Roll Roofing, Non-Fibered, Asbestos-Fibered, and Non-Asbestos-FiberedPROPOSED CHANGE Table Footnote (1)
ASTM D 4479/D 4479M, Asphalt Roof Coatings—Asbestos-Free
CGSB 37-GP-56M, Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing
CAN/CGSB-37.50-M, Hot-Applied, Rubberized Asphalt for Roofing and Waterproofing
CAN/CSA-A123.2, Asphalt-Coated Roofing Sheets
CSA A123.3, Asphalt Saturated Organic Roofing Felt
CAN/CSA-A123.4, Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems
CSA A123.17, Asphalt Glass Felt Used in Roofing and Waterproofing
Single-ply membranes CAN/CGSB-37.54, Polyvinyl Chloride Roofing and Waterproofing Membrane
CAN/CGSB-37.58-M, Membrane, Elastomeric, Cold-Applied Liquid, for Non-Exposed Use in Roofing and Waterproofing
ASTM D 4637/D 4637M, EPDM Sheet Used In Single-Ply Roof Membrane
ASTM D 4811, Nonvulcanized (Uncured) Rubber Sheet Used as Roof Flashing
ASTM D 6878/D 6878M, Thermoplastic Polyolefin Based Sheet Roofing
Shingles, shakes, tiles, panels CSA A123.1, Asphalt Shingles Made From Organic Felt and Surfaced with Mineral Granules
CSA A123.5, Asphalt Shingles Made From Glass Felt and Surfaced with Mineral Granules
CAN/CSA-A220 Series, Concrete Roof Tiles
CSA O118.1, Western Red Cedar Shakes and Shingles
CSA O118.2, Eastern White Cedar Shingles
Eave protection CSA A123.22, Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection
Flashing ASTM D 4811, Nonvulcanized (Uncured) Rubber Sheet Used as Roof Flashing
Note to Table [9.26.2.1.B] :
Footnote 1

For the purpose of this Subsection, ASTM D 3019, “Lap Cement Used with Asphalt Roll Roofing, Non-Fibered, Asbestos-Fibered, and Non-Asbestos-Fibered,” only applies to the non-fibered and non-asbestos-fibered types (I and III) of asphalt roll roofing.

PROPOSED CHANGE Table Footnote(1) referrer

RATIONALE

Problem

The Task Group for Roofing, Waterproofing and Dampproofing Standards reviewed all outdated and withdrawn CGSB standards for roofing, waterproofing and dampproofing application.

Many of the CGSB standards referenced in 9.26.2.1. for roofing materials and some accessory materials applications have been withdrawn by CGSB in 2003. Those CGSB standards that had not been withdrawn were outdated and sometimes obsolete or not applicable to roofing.
It was not clear with the list of standards as to whether the standard was applicable to a specific material or roofing component/accessory.

Justification - Explanation

The Task Group agreed to retain the references to

37-GP-9MA-1983; 37-GP-50M-1989; 37-GP-54M-1995 and 37-GP-56M-1985.

While the TG found no up-to-date equivalents for these standards it agreed nonetheless that the standards represent acceptable minimum requirements for material groups that are widely used in the field.  The TG agreed therefore to reference the outdated editions of these CGSB standards and requested that the responsible SDO should maintain these standards.

The Task Group agreed to delete without replacement the references to

-     CAN/CGSB-37.5-M89 and CGSB 37-GP-21M-1985 since the respective material types are recommended for repair only,

-     CGSB 41-GP-6M, which is not a suitable material for the use in applications related to environmental separation,

The standards that will be recommended to be replaced are:

-          CAN/CGSB-37.4-M

-          CAN/CGSB-37.8-M, and

-          CGSB-37-GP-52M.

 

New standards are proposed to replace the outdated and obsolete CGSB standards. This resulted in some limitations to standard references and also to some rewording of code provisions providing the context for the reference to these standards.

 

Cost implications

The proposed material standards are widely accepted by manufacturers and more testing laboratories are accredited for testing according to the proposed standards than to the currently referenced ones.
A possible cost increase (for testing to new standards) would be balanced against the reduced risk of liability for contractors and designers, who are now able to use code compliant materials that are available on the market rather than installing materials tested to up-to-date standards available on the market which are not listed in the code. Continuing the specification of the current code-compliant materials may result in unacceptable performance as the respective material standards have not been kept up-to-date.
Some new material standards have been referenced, which increase the design choice and may therefore permit cost reductions. No cost increases are expected as the intent of the proposed change is to keep the same performance level, reduce liability and risk, and increase design choices.

Enforcement implications

The separation of the material tables is intended to facilitate enforcement through simplifying the standards application.
Enforcement of materials through referencing standards is generally achieved through the use of labels, stamps and markings on the materials or through manufacturers documentation, this approach is not intended to be changed.

Who is affected

Builders, contractors, manufacturers, warranty providers, building officials, building owners, designers

OBJECTIVE-BASED ANALYSIS OF NEW OR CHANGED PROVISIONS

[9.26.2.1.] 9.26.2.1. ([1] 1) [F61-OH1.1,OH1.2,OH1.3]
[9.26.2.1.] 9.26.2.1. ([1] 1) [F61-OS2.3]
[9.26.2.1.] -- ([2] --) [F61-OH1.1,OH1.2,OH1.3]
[9.26.2.1.] -- ([2] --) [F61-OS2.3]