[CCMC 13519-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

In most jurisdictions this document is sufficient evidence for approval by Canadian authorities.

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Code compliance opinion

It is the opinion of the Canadian Construction Materials Centre that “Legerclad (Air Barrier Material)”, when used as an air barrier material in accordance with the conditions and limitations stated in this evaluation, complies with the following Canadian code(s):

National Building Code of Canada 2015

Code provision Solution type
5.4.1.2. Air Barrier System PropertiesAlternative
9.25.3.2. Air Barrier System PropertiesAlternative

Code du bâtiment de l'Ontario 2017

Ruling No. 14-10-306 (13519-R) authorizing the use of this product in Ontario, subject to the terms and conditions contained in the Ruling, was made by the Minister of Municipal Affairs and Housing on 2014-10-27 pursuant to s.29 of the Building Code Act, 1992 (see Ruling for terms and conditions). This Ruling is subject to periodic revisions and updates.


The above opinion is 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 which forms the basis of this evaluation has been included.

  Product information

Product description

This Report addresses the performance of the product as an air barrier material within the Le Groupe Legerlite Inc.-specified “Legerclad” air barrier system. This air barrier system has not been evaluated, but is presented in Air barrier material appendix as additional information for the convenience of building officials and designers.

The product’s material, if installed as part of the designated air barrier system, will serve a dual function in the wall assembly. Use of the product as a sheathing membrane to control incidental water infiltration behind cladding is covered under a separate CCMC Evaluation Report (see CCMC 13510-R).

The product is a Type 2, preformed, moulded, expanded polystyrene rigid insulation panel (CCMC 12836-L). The panels are plant-laminated to a spun-bonded olefin sheathing membrane (see “Typar® HouseWrap/CertaWrap” under CCMC 12892-L) with hot-melt adhesive “THERMOBOND JPS70300” applied in 0.51-mm thicknesses every 7.6 mm. The panels are commonly 1 219 mm × 2 438 mm or 1 219 mm × 2 743 mm and are available in 25 mm to 76 mm thicknesses.

Manufacturing plants

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

  • Pointe-Claire, Québec, Canada

  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 product is capable of being the principal plane of airtightness in an air barrier system by demonstrating a sufficiently low air permeance equivalent to the materials outlined in Appendix A-9.25.5.1.(1), Air and Vapour Permeance Values, and Sentence 5.4.1.2.(1) of Division B of the NBC 2015.
  • When the material is installed as part of the airtight element of the designated air barrier system, the vapour barrier must generally comply with Sentences 9.25.4.2.(1), (2), (5) and (6), Vapour Barrier Materials, of Division B of the NBC 2015. In cases where another low water vapour permeance element has been installed in the wall assembly, Sentences 9.25.4.2.(3) and (4) apply
  • A conforming installation must be:
    • installed with the printed side facing outward and protected from exposure to ultraviolet (UV) radiation from the sun within 60 days;
    • installed with a minimum 10-mm air space between the sheathing membrane and the cladding, unless the cladding has been deemed to not require an air space (e.g., deemed by CCMC or deemed by building officials based on past cladding performance); and
    • installed according to the most recent update of the “Legerclad” Installation Manual of Le Groupe Legerlite Inc. (examples of the installation details are presented as additional information inAir barrier material appendix).
  • It should be noted that a concealed air space exceeding 25 mm in width must contain proper fire blocking in accordance with Subsection 9.10.16., Fire Blocks, of Division B of the NBC 2015.
  • CCMC-evaluated sheathing tape must be used to seal all joints.

  Technical information

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

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

 

The Report 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.

The durability assessment of the product is covered under CCMC 13510-R.

Performance requirements
Results of testing the product to the CCMC technical guide for air barrier materials
Test Requirement Result
Five 1-m2 membrane specimens tested and measured for air permeance at a minimum of six air pressure differentials (DP) between 0 Pa and 250 Pa Air leakage rate at 75 Pa (ΔP) (based on linear regression of 30 data points) ≤ 0.02 L/(s·m2) 0.001 L/(s·m2)
Other technical evidence

Additional performance data requested by the report holder

Result of testing water vapour permeance of the product
Property Unit Requirement Result
Water vapour permeance with NBC-required directionality (50 mm)Table footnote (1) ng/(Pa·s·m2) ≥ 60 77.0Table footnote (2)
Water vapour permeance with NBC-required directionality (24.25 mm)Table footnote (1) ng/(Pa·s·m2) ≥ 60 134.9Table footnote (2)
Air barrier material appendix  

An air barrier material as part of an air barrier system

The CCMC has not evaluated the performance of the “Legerclad” air barrier system in conformance with Article 9.25.3.2., Air Barrier System Properties, of Division B of the NBC 2015. However, the CCMC’s opinion is that an air barrier system, using this material and installed in conformance with the details outlined below and in the Installation Manual of Le Groupe Legerlite Inc., should satisfy the requirements for continuity of the air barrier system in Articles 9.25.3.1., Required Barrier to Air Leakage, and 9.25.3.3., Continuity of the Air Barrier System, of Division B of the NBC 2015.

Discussion

Authorities having jurisdiction (AHJs) should be aware that this system differs from the typical air barrier approach, which uses a flexible membrane as the principal plane of airtightness. In the typical approach, the membrane (i.e., polyethylene sheet) is normally sandwiched between two other materials so that it is not required to resist, on its own, the full force of indoor/outdoor pressure differences induced by stack effect, mechanical systems and, most importantly, wind.

In a system in which a composite of insulation board and membrane is applied to the outer surface of the wall, such as the proposed air barrier system, that composite board must have adequate strength and attachment to resist the anticipated wind pressures. The CCMC’s evaluation of the proposed material does not include the evaluation of this strength or the strength of the continuity details. The AHJ must therefore determine whether the proposed air barrier system, described herein, meets the intent of Sentence 9.25.3.2.(1) of Division B of the NBC 2015 as being an effective barrier for the proposed construction in the proposed geographical/climate area. For example, based on their experience, the AHJ may deem the proposed air barrier system adequate for buildings in urban areas, sheltered sites or areas of low wind, but inadequate in areas of high wind and exposed sites in rural or coastal areas.

An air barrier system checklist for the AHJ to consider is the following; an air barrier system must:

  1. have an acceptable low air leakage rate;
  2. be continuous;
  3. be durable;
  4. have sufficient strength to resist the anticipated air pressure load; and
  5. be buildable in the field.

Installation details

The “Legerclad” material is applied over the structural framing complying with the NBC 2015. It does not contribute to an air barrier system until it is joined to the other components that make up the air barrier system of the building. The Installation Manual of Le Groupe Legerlite Inc. outlines how the proposed material must be joined to the foundation wall, windows and doors, penetrations in the wall and the ceiling air barrier, thus forming the system.

A successful air barrier system installation is predicated on sequencing during construction. Coordination is required during erection of framing and after completion of the air barrier system to ensure that no other trade breaches the integrity of the installed air barrier system.

The proposed air barrier system is defined as possessing the following features:

  1. “Legerclad” material as the principal plane of airtightness;
  2. accessories, including sealants and CCMC-evaluated sheathing tape to maintain continuity at junctions with penetrations in the wall assembly (i.e., windows, doors, pipes, ducts, electrical outlets, etc.), and in accordance with continuity details in the Installation Manual of Le Groupe Legerlite Inc.;
  3. be durable, meeting UV and heat-aging requirements
  4. exterior sheathing with specified fasteners and fastening schedule of the product for structural support against anticipated pressure loads; and
  5. be buildable in the field by builders following the Installation Manual of Le Groupe Legerlite Inc. and reviewed by building officials.

The figures below outline typical construction details of an air barrier system. For specific information on the product’s construction and installation details, refer to the “Legerclad” Installation Manual of the Le Groupe Legerlite Inc.

 

Illustration of exterior wall.
Figure 1. Exterior wall
  1. sheathing tape

 

 

Illustration of exterior wall (side view).
Figure 2. Exterior wall
  1. ceiling air/vapour barrier
  2. air barrier strip
  3. CCMC-evaluated sheathing tape
  4. "Legerclad"
  5. CCMC-evaluated sheathing tape

 

All joints between the panels must be sealed with CCMC-evaluated sheathing tape. To maintain continuity, the wall membrane must be extended over the top plates and taped to the ceiling membrane.

 

Illustration of foundation/exterior wall detail.
Figure 3. Foundation/Exterior wall detail
  1. sill plate gasket
  2. sheathing tape
  3. flashing
  4. seal the joint between the "Legerclad" board and the flashing
  5. the flashing must be sealed to the foundation wall

 

Illustration of foundation/exterior wall detail.
Figure 4. Foundation/Exterior wall detail
  1. sill plate gasket
  2. flashing
  3. seal the joint between the “Legerclad” board and the flashing
  4. the flashing must be sealed on the foundation wall

 

The foundation wall forms part of the air barrier system; the proposed membrane must therefore be sealed to the foundation wall to maintain continuity. The sealants used must be compatible with “Typar® HouseWrap/CertaWrap.” Silicone-based sealants must not be used. To maintain continuity to prevent water infiltration, a seal at the sill must be provided to direct water toward the exterior.

 

Illustration of continuity at window penetrations.
Figure 5. Continuity at window penetrations
  1. window flashing tape
  2. sheathing tape

 

The continuity of the proposed membrane must be maintained by sealing the membrane to windows and doors. This may be accomplished by adding a membrane to the frame around the window openings and then sealing it to the windows with either a foam sealant or elastomeric sealant/backer rod. These sealants must be compatible with the surfaces being joined.

 

Exterior electrical junction boxes and receptacles.
Figure 6. Exterior electrical junction boxes and receptacles
  1. “Legerclad”
  2. airtight plastic electrical box
  3. snap-on cover plate

 

All exterior electrical boxes and receptacles that penetrate the proposed air barrier material must be airtight boxes. Otherwise, electrical boxes must be wrapped and sealed to the proposed air barrier material to maintain continuity at these locations.

 

Sealing at penetrations through exterior wall.
Figure 7. Sealing at penetrations through exterior wall
  1. seal the gap around penetrations
  2. cut “Legerclad” to fit around penetrations

 

When a pipe, duct or other element penetrates the exterior wall and the proposed air barrier material, it must be sealed. Use sealant or CCMC-evaluated sheathing tape, whichever is more appropriate for the element being sealed to.

Administrative information

Disclaimer

This evaluation is issued by the Canadian Construction Materials Centre (CCMC), a part of the Construction Research Centre at the National Research Council of Canada (NRC). The evaluation must be read in the context of the entire CCMC Registry of Product Assessments and the legislated applicable building code in effect.

The CCMC was established in 1988 on behalf of the applicable regulator (i.e., the provinces and territories) to ensure—through assessment—conformity of alternative and acceptable solutions to regional building codes as determined by the local authority having jurisdiction (AHJ) as part of the issuance of a building permit.

It is the responsibility of the local AHJs, design professionals, and specifiers to confirm that the evaluation is current and has not been withdrawn or superseded by a later issue. Please refer to the website or contact:

Canadian Construction Materials Centre
Construction Research Centre
National Research Council of Canada
1200 Montreal Road
Ottawa, Ontario, K1A 0R6
Telephone: 613-993-6189
Fax: 613-952-0268

The NRC has evaluated the material, product, system or service described herein only for those characteristics stated 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 (i.e., AHJs, design professionals and specifiers). This evaluation is only valid when the product is installed in strict compliance with the stated conditions and limitations of evaluation and the applicable local building code. In circumstances where no applicable local building permit is issued and that no confirmation of compliance ‘for use in the intended field application’ is undertaken, this evaluation is null and void in all respects. This evaluation is provided without representation, warranty, or guarantee of any kind, expressed, or implied, and the NRC provides no endorsement for any evaluated material, product, system or service described herein. The NRC accepts no responsibility whatsoever arising in any way from any and all use and reliance on the information contained in this evaluation with respect to its compliance to the referenced code(s) and standard(s). 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.

Language

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In the case of any discrepancy between the English and French version of this document, the English version shall prevail.

Copyright

© 2020 Her Majesty the Queen in Right of Canada, as represented by the National Research Council of Canada.

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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