CSA A123.26:21

National Standard of Canada

Performance requirements for climate resilience of low slope membrane roofing systems

REVISED APRIL 2021

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  Revision History

  CSA A123.26:21, Performance requirements for climate resilience of low slope membrane roofing systems

  
  

  Administrative update — April 2021

  National Standard of Canada page: French version now available

  
  

  Standards Update Service

  CSA A123.26:21

  January 2021

  
  

  Title: Performance requirements for climate resilience of low slope membrane roofing systems

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National Standard of Canada

CSA A123.26:21

Performance requirements for climate resilience of low slope membrane roofing systems

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CSA A123.26:21

Performance requirements for climate resilience of low slope

membrane roofing systems

Contents

Technical Committee on Bituminous Roofing Materials 2

Task Group on Climate Resilience of Low Slope Membrane Roofing Systems 6

Preface 8

1. Scope 9

   
   

2. Reference publications 10

   
   

3. Definitions and abbreviations 11

   1. Definitions 11

   2. Abbreviations 12

      
      

4. Determination of performance level 12

   
   

5. Performance requirements 12

   
   

6. Wind performance requirements 13

   1. Roof 13

   2. Rooftop add-ons 14

      
      

7. Rain performance requirements 15

   1. Rain water resistance 15

   2. Rain water control 17

Annex A (informative) — Commentary on Clauses 6 and 7 19

Annex B (informative) — Guidelines for in-situ negative pressure uplift test on low slope membrane roof systems 23

Annex C (informative) — General guidelines 29

January 2021 © 2021 Canadian Standards Association 1

CSA A123.26:21

Performance requirements for climate resilience of low slope

membrane roofing systems

Preface

This is the first edition of CSA A123.26, Performance requirements for climate resilience of low slope membrane roofing systems.

This Standard was prepared by the Task Group on Climate Resilience of Low Slope Membrane Roofing Systems, under the jurisdiction of the Technical Committee on Bituminous Roofing Materials and the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee.

This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Notes:

1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

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January 2021 © 2021 Canadian Standards Association 8

CSA A123.26:21

Performance requirements for climate resilience of low slope

membrane roofing systems

CSA A123.26:21

Performance requirements for climate resilience of low slope membrane roofing systems

1 Scope

1.1

This Standard outlines requirements for low slope membrane roofing systems (LSMRS) when identified as “silver” and “gold” performance level based on the climate severity and resilience requirements.

Note: The National Building Code of Canada and the National Energy Code of Canada for Buildings provides “bronze” requirements for LSMRS.

1.2

This Standard is intended to be used by building designers, building owners, building code officials, product manufacturers, and installers.

1.3

The requirements provided in this Standard do not include, nor are they intended to override other requirements, by the governing building code or the authority having jurisdiction (AHJ).

1.4

This Standard does not address the climatic adaptation requirements for the structural support (deck) below the LSMRS.

1.5

This Standard does not purport to address all the health and safety aspects associated with its use. Anyone using this Standard has the responsibility to consult with the appropriate authorities and to establish health and safety practices, in conjunction with any existing applicable regulatory requirements, prior to its use.

1.6

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

January 2021 © 2021 Canadian Standards Association 9