[CCMC 14134-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

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Compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as an air barrier material in accordance with the conditions and limitations stated in this evaluation, complies with the following code:

National Building Code of Canada 2015

ID Code provision Solution type
05-04-01-02-00-0- Except as provided in Sentence ...Acceptable
09-25-03-02-00-0- Where polyethylene sheet is used to prov ...Alternative
09-36-02-10-00-0- Materials intended to provide the princi ...Acceptable

The above opinion(s) is/are based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.

Product information

Product name

Si-COAT®422AB™ – Air Barrier Material

Product description


This Evaluation Report addresses the performance of the product as an air barrier material within the CSL Silicones Inc.-specified proprietary Si-COAT® Fluid-Applied Tri-Functional Air Barrier System. The silicone-based, spray-applied Si-COAT® 422AB coating is intended for application over 12.7 mm DensGlass® exterior gypsum wall sheathing (manufactured by Georgia-Pacific) only. Continuity details are specified within the “Si-COAT® Fluid-Applied Tri-Functional Air Barrier System – Application Instructions for Building Envelope Solutions” dated 2019-03-08. The CSL Silicones Inc. air barrier system over 12.7 mm DensGlass® has been tested in accordance with CAN/ULC-S742-11, “Air Barrier Assemblies – Specification” and will be covered under a separate CCMC Evaluation Report to be published.

This Report covers the qualification of the product as the air barrier material that forms the principal plane of airtightness of CSL Silicones Inc.’s proprietary air barrier system. When this product is installed as the designated air barrier system, it will serve a dual role in the wall assembly in CSL Silicones Inc.’s proprietary air barrier systemTable footnote (1): first, as a sheathing membraneTable footnote (1) that does not require other protection from water penetration (covered under CCMC 14102-R); and second, as air leakage control, once it is installed in conformance with this CCMC Report.

Material description

Si-COAT® 422AB – Air Barrier Material is a silicone-based, spray-applied coating identified by CSL Silicones Inc. as the principal plane of airtightness within CSL Silicones Inc.’s proprietary air barrier system. The product is used for spraying over and sealing installed DensGlass® exterior gypsum wall sheathing. The product is spray-applied, liquid silicone that is moisture-cured, elastomeric and monolithic, and forms a membrane that resists moisture and protects against air infiltration. The Si-COAT® 422AB is a low volatile organic compound (VOC) formulation.

Spray application

The product is spray-applied on-site by CSL Silicones Inc.-authorized installers certified by the Society for Protective Coatings (SSPC). The product must be applied to a wet film thickness (WFT) of 0.62 to 0.9 mm (25 to 35 mils) to produce a DFT of 0.62 ± 0.13 mm (25 ± 5 mils). The cured coating forms a silver/grey silicone membrane; additional colours are also available.

Before the final overall coating is sprayed by the SSPC-certified installer, the joints and fastener heads in the DensGlass® gypsum sheathing substrate are to be sealed with CSL423 Liquid-Applied Air Barrier Flashing Sealant or CSL424 Weatherproofing Sealant, which are applied in a serpentine fashion and then spread to form a 100 mm (4 in.) ribbon over the joint having a WFT of 0.635 mm (25 mils). The rough openings of windows and doors are to be flashed with “CSL423 Liquid-Applied Air Barrier Flashing Sealant.” All applications must be in accordance with the CSL installation instructions specified in the Installation section and in the figures below.

Substrates and required insulation

As per the test results in the Technical information section of this Report, the product is semi-vapour permeable and provides a breather-type performance when installed at the specified WFT over 12.7 mm DensGlass®. The combined WVP is 187 to 236 ng/(Pa·s·m2), which exceeds the greater than 60 ng/(Pa·s·m2) requirement. Therefore, at the specified WFT, the composite water vapour permeance of the coating and DensGlass® remains breathable, thus no insulation is required, but insulation may be installed to improve the thermal resistance of the wall assembly. However, if the applicator applies a coating thickness that exceeds the specified thickness, the composite water vapour permeance may be below the 60 ng/(Pa·s·m2) NBC restriction for low air and water vapour permeance materials installed on the cold side of the assembly, whereby insulation meeting the outboard/inboard ratio must then be installed. See the Conditions and limitations section of this Report.


The product and CSL Silicones Inc.-specified sealant accessories shall be installed in accordance with the CSL Silicones Inc. publication “Si-COAT® Fluid-Applied Tri-Functional Air Barrier System – Application Instructions for Building Envelope Solutions” dated 2019-03-08. The CSL Silicones Inc.-authorized installers are trained and certified SSPC installers. The card-carrying SSPC installers shall have their certification cards on hand, and a copy of the CSL installation instructions shall be on site for review by building officials during their inspection. The WFT gauge shall be used to confirm that the WFT is within the target limits of 0.62 to 0.9 mm (25 to 35 mils). (Excerpts of the installation instructions are shown in Figure 1 for information purposes only. See Figure 2 for the specified WFT gauge.)

Typical application of the product where specified to maintain continuity for air leakage control.

Figure 1. Typical application of CSL423 Liquid-Applied Air Barrier Flashing Sealant and CSL424 Weatherproofing Sealant where specified to maintain continuity for air leakage control.

1. Serpentine bead centered over sheathing joint
2. Spot all fasteners
3. Feathered Edge
4. Tool ribbon flat and feather edges
5. Step 1
6. Step 2
7. Step 3
8. With Back-Dam


Wet film thickness gauge.

Figure 2. CSL Silicones Inc. wet film thickness gauge

Manufacturing plant

This evaluation is valid only for products produced at the following plant:

Product nameManufacturing plant
Guelph, ON, CA
Si-COAT®422AB™ – Air Barrier MaterialProduct evaluated by the CCMC

Product evaluated by the CCMC Indicates that the product from this manufacturing facility has been evaluated by the CCMC

  Conditions and limitations

The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.

  •  The coating shall be installed in conformance with the CSL Silicones Inc.-specified installation instructions “Si-COAT® Fluid-Applied Tri-Functional Air Barrier System – Application Instructions for Building Envelope Solutions” dated 2019-03-08.
  • The installation must be conducted by SSPC-certified installers to ensure the Si-COAT® 422AB Air Barrier Material product is sprayed to a WFT range of 0.62 to 0.90 mm (25 to 35 mils) to produce a DFT of 0.62 ± 0.13 mm (25 ± 5 mils). The manufacturer should be contacted if the installation does not conform to the CSL Silicones Inc. specifications.
  • If the WFT is excessively over-specifications (i.e., > 35 mils) during installation, the WVP may be below 60 ng/(Pa·s·m2), and insulation must then be installed to comply with the outboard/inboard ratio specified in Article Position of Low Permeance Materials, of Division B of the NBC 2015.
  • All exterior wall penetrations must be sealed, as per the CSL published details, before the Si-COAT® 422AB coating is installed over the entire surface.
  • The cladding fasteners must be installed at stud locations as exterior gypsum sheathing is not approved for cladding attachment.
  • The components must be clearly identified with the phrase “CCMC 14134-R.”

  Technical information

This evaluation is based on demonstrated conformance with the following criteria:

Evaluation requirements
Criteria number Criteria name
CCMC-TG-072709.02-15DCCMC Technical Guide for Air Barrier Materials

 The evaluation holder has submitted technical documentation for the CCMC’s evaluation. Testing was conducted at laboratories recognized by the CCMC. The corresponding technical evidence for this product is summarized below.

Performance requirements
Results of testing Si-COAT® 422AB coating to CAN/ULC S741
Test Requirement Result
Five 1 m2 specimens were tested and measured for air permeance, before-and-after accelerated aging,  at a minimum of six air pressure differentials (ΔP) between 0 and 250 Pa. Air leakage rate at 75 Pa ΔP (based on linear regression of 30 data points) ≤ 0.02 L/(s·m2) 0.002 L/(s·m2)
Table 1. Combined WVP of Si-COAT® 422AB coating over DensGlass®Table footnote footnote (1) panel assemblies
Property Unit Requirement Si-COAT® 422AB Result
WVP (applied over 12.7 mm DensGlass® at 25 ± 5 mils DFT thickness) ng/(Pa·s·m2) > 60 187

Administrative information

Use of Canadian Construction Materials Centre (CCMC) assessments

This assessment must be read in the context of the entire CCMC Registry of Product Assessments, any applicable building code or by-law requirements, and/or any other regulatory requirements (for example, the Canada Consumer Product Safety Act, the Canadian Environmental Protection Act, etc.).

It is the responsibility of the user to confirm that the assessment they are using is current and has not been withdrawn or superseded by a later version on the CCMC Registry of Product Assessments.


The National Research Council of Canada (NRC) has evaluated only the characteristics of the specific product described herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (such as authorities having jurisdiction, design professionals and specifiers). This evaluation is valid when the product is used as part of permitted construction, respecting all conditions and limitations stated in the evaluation, and in accordance with applicable building codes and by-laws.

This evaluation is provided without representation, warranty or guarantee of any kind, expressed or implied, and the NRC provides no endorsement for any evaluated product. The NRC accepts no responsibility whatsoever arising in any way from any and all use of or reliance on the information contained herein or the use of any evaluated product. The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.


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© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2024

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

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