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[CCMC evaluation requirements] CAN/CGSB-51.32-M77

From: National Research Council Canada

This document provides a summary of the minimum requirements imposed by the Canadian Construction Materials Centre (CCMC) for all evaluations based on the below criteria document. Additional requirements may be imposed by the CCMC when necessary for a particular evaluation, and are detailed in the individual evaluation.

Criteria document


These evaluations apply to wall sheathing membranes intended for use on the outside of heated buildings, under the external finish, as a secondary protective covering against the entry of wind and moisture. They are to provide moisture-resistant and draught-resistant barriers that do not impede the passage of water vapour and therefore minimize the condensation of such vapour.

Material requirements

The evaluation holder must demonstrate that the product meets the following requirements (additional requirements may be imposed by the CCMC when necessary, and are detailed in the individual evaluation):

Requirements of the standard
Test Unit Requirement
Visual inspection n/a Pass Footnote (1)
Width tolerance mm −6
Pliability n/a no cracking
Tensile strength N/mm ≥ 3.5
Water vapour permeance ng/(Pa·s·m 2) ≥ 170; ≤ 1400
Maximum water vapour permeance after accelerated aging ng/(Pa·s·m 2) 2 900


Each roll must be identified to show the following information:

  • the name of the product,
  • the phrase “CAN/CGSB-51.32-M77,” and
  • the associated CCMC number

© Canadian General Standards Board. This standard is withdrawn by CGSB due to limited use and support for their revision. Therefore, the information contained therein may no longer represent the most current, reliable, and/or available information on these subjects. CGSB hereby disclaims any and all claims, representation or warranty.

Installation requirements

The CCMC requires that evaluation holders provide instructions for the installation of the product(s) that:

Manufacturing requirements

The CCMC requires that evaluation holders, at a minimum, demonstrate that the associated production process:

Labelling requirements

The CCMC requires that evaluation holders ensure that product labels:

Published CCMC evaluations

The following products have been evaluated to these requirements by the CCMC:

CCMC number:Manufacturer:Product names:
11479-LHal Industries Inc. Hal-Tex 20, Vaporex, Hal-Tex 30, Hal-Tex 60, Hal-Tex Cor-Ply, Hal-Tex Rainboard

Code references

National Building Code of Canada 2015

Code references Code provision Except as provided in Sentence 9.20.13. ... Sheathing Membrane Material Standard
A- of Masonry Walls
Table Applicable to Environmental Separators and Assemblies Exposed to the Exterior