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[CCMC 12857-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

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

Learn more about CCMC recognition Look for the trusted CCMC mark on products to verify compliance.

Code compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as 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

Ontario Building Code

Ruling No. 10-08-245 (12857-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 2010-04-12 (revised 2017-03-31) 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 that forms the basis of this evaluation has been included.

Product information

Product name

Tyvek® HomeWrap® – Air Barrier Material

Product description

This evaluation addresses the performance of the product as an air barrier material within the DuPont Canada-specified Tyvek® HomeWrap® air barrier system. The DuPont Canada-specified Tyvek® HomeWrap® air barrier system has not been evaluated, but is covered in the Additional information section of this evaluation for the convenience of building officials and designers. 

If the product is installed as part of the designated air barrier system, it 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 (see CCMC 12808-R).

The product is a white, spun-bonded olefin material that is made by combining continuous fibres of high-density polyethylene into a sheet using a heat and pressure process. The product is 0.15 mm thick and is available in rolls ranging from 0.91 m to 2.90 m wide and from 30.5 m to 60.9 m long.

Manufacturing plant

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

Product nameManufacturing plant
Richmond, VA, US
Tyvek® HomeWrap® – 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.

  • When the product is installed as part of the main airtight element in the designated air barrier system, the vapour barrier needs only to comply with Article, Vapour Barrier Materials, of Division B of the NBC 2015 (i.e. does not need to be continuous but must meet the maximum 60 ng/(Pa∙s∙m2) requirements and the other applicable requirements of this Article). In cases where another low air and water vapour permeance material has been installed outboard of the innermost impermeable surface of the assembly, then Article, General (Properties and Position of Materials in the Building Envelope), of Division B of the NBC 2015 must be met.
  • The product must be installed:
    • with the printed side facing outward and protected from exposure to ultraviolet (UV) radiation from the sun within 60 days;
    • 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 the CCMC or by building officials based on past cladding performance); and
    • according to DuPont™ Tyvek® Sheathing Membranes and DuPont Self-Adhered Flashing Products Installation Guidelines dated August 2022 (sheathing membrane, air barrier and header wrap). Examples of the installation details are presented under Technical information.
  • 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.
  • Where a CCMC-evaluated sheathing tape in accordance with the MasterFormat 07 25 20 is used to seal joints, the  Tyvek® HomeWrap® must be referenced as a tested substrate within the CCMC sheathing tape evaluation report otherwise, its adhesion over the Tyvek® HomeWrap® must be validated by DuPont.

  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
Table 1. Results of testing of performance requirements of the product
Test Unit Requirement Result
Five 1-m2 membrane specimens tested and measured for air permeance at a minimum of six air pressure differentials (ΔP) between 0 Pa and 300 Pa

unconditioned specimens

L/(s·m2) Air leakage rate at 75 Pa ΔP (based on linear regression of 30 data points) ≤ 0.02 L/(s·m2) 0.0071
conditioned specimens N/A Where less than 0.01 L/(s·m2) for unconditioned specimens, the air leakage rate for conditioned specimens must not increase by more than 0.001 L/(s·m2) at 75 Pa pressure difference Pass
Water vapour transmission exfiltration direction ng/(Pa∙s∙m2) Report value 1 320 ng/(Pa·s·m2)
infiltration direction ng/(Pa∙s∙m2) Report value 1 580 ng/(Pa·s·m2)


The assessment of the product’s durability is covered under CCMC 12808-R.

Additional information

 An air barrier material as part of an air barrier system

The CCMC has not evaluated the performance of the Tyvek® HomeWrap® air barrier system in respect of its conformance with Article, 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 as well as in DuPont™ Tyvek® Sheathing Membranes and DuPont Self-Adhered Flashing Products Installation Guidelines should satisfy the requirements for continuity of the air barrier system in Articles, Required Barrier to Air Leakage, and, Continuity of the Air Barrier System, of Division B of the NBC 2015.


Authorities having jurisdiction (AHJ) 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 the membrane is applied to the outer surface of the wall sheathing, as it is in the Tyvek® HomeWrap® air barrier system, that membrane does not have continuous support against outward air pressure and must, therefore, have adequate strength to resist that pressure by spanning between points of support, such as its own fastening points or the points where strapping or cladding is fastened to the wall. The CCMC’s evaluation of the Tyvek® HomeWrap® material does not include the evaluation of this strength or the strength of the continuity details. The AHJ must, therefore, determine whether the product’s air barrier system, described herein, meets the intent of Sentence of Division B of the NBC 2015, as being an effective barrier for the proposed construction in the proposed geographical/climate area. For example, the AHJ may deem the proposed air barrier system adequate for buildings in urban areas, sheltered sites or areas of low wind, based on their experience, 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 below.

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 product’s material is applied over exterior wood-based wall sheathing material 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. DuPont™ Tyvek® Sheathing Membranes and DuPont Self-Adhered Flashing Products Installation Guidelines outlines how the product’s material must be joined to the foundation wall, to windows and doors, to penetrations in the wall, and to 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. Tyvek® HomeWrap® material as the principal plane of airtightness;
  2. accessories including sealants and the CCMC-evaluated sheathing tape that has adhered strength approved by DuPont with Tyvek HomeWrap® 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 DuPont™ Tyvek® Sheathing Membranes and DuPont Self-Adhered Flashing Products Installation Guidelines;
  3. be durable, meeting UV and heat-aging requirements;
  4. exterior sheathing with specified fasteners and fastening schedule of the Tyvek® HomeWrap® for structural support against anticipated pressure loads; and
  5. be buildable in the field by builders following the DuPont Canada installation manual and reviewed by building officials.

The air barrier system is to be built in the field by informed builders and reviewed by building officials. DuPont Canada has established a field monitoring program to ensure the proper installation of the air barrier system.

The figures below outline typical construction details of the installation of the proposed air barrier system in the field. See DuPont™ Tyvek® Sheathing Membranes and DuPont Self-Adhered Flashing Products Installation Guidelines for additional details.

Tyvek HomeWrap exterior wall cross-section – top wall/ceiling continuity.
Figure 1. Tyvek® HomeWrap® exterior wall cross-section – top wall/ceiling continuity
  1. wood-based sheathing installed with open horizontal gap
  2. ceiling air/vapour barrier
  3. CCMC-evaluated sheathing tape
  4. Tyvek® HomeWrap®
  5. typical 100-mm overlap and tape


All horizontal joints in the material must be overlapped by at least 100 mm and taped with CCMC-evaluated sheathing tape (that has adhesion strength with Tyvek® HomeWrap® approved by Dupont). To maintain continuity of the plane of airtightness, the material must be bridge through the top plates and be sealed to the ceiling membrane using an appropriate transition membrane. The material should be secured underneath the transition membrane to ensure proper shingling.

Wood-based sheathing, glass-fibre-faced exterior gypsum board, or exterior gypsum board having a water vapour permeance of less than 60 ng/(Pa·s·m2) must be installed in accordance with Article, Position of Low Permeance Materials, of Division B of the NBC 2015.

For wood-based sheathing, a gap of not less than 2 mm must be left between sheets in accordance with Article, Joints in Panel-Type Sheathing, of Division B of the NBC 2015.

Tyvek HomeWrap bottom foundation detail.
Figure 2. Tyvek® HomeWrap® bottom foundation detail
  1. sill plate gasket
  2. sealant
  3. Tyvek® HomeWrap®
  4. tape
  5. flashing
  6. sealant
  7. still plate gasket
  8. flashing

When the foundation wall is part of the air barrier system, the material must be sealed to the foundation wall to maintain the continuity of the plane of airtightness. Sealants used must be compatible with the product; for example, silicone-based sealants must not be used. To maintain watertightness, Tyvek® HomeWrap® sheathing membrane must be installed over the flashing and taped to properly drain any rain penetration breaching the cladding.

Tyvek HomeWrap structural fasteners.
Figure 3. Tyvek® HomeWrap® structural fasteners
  1. stud centrelines
  2. 300 mm o.c.
  3. 150 mm o.c.
  4. 600 mm o.c.
  5. overlap & tape vertical seams
  6. 25 mm cap nails or brick ties to be installed 150 mm o.c. into stud


When installed as the principal plane of airtightness, the product must be structurally attached with nails with plastic washers, screws with plastic washers, 19-mm-thick furring strips or appropriate brick tie anchors as specified by the manufacturer's installation instructions.

For wood-frame construction where the sheathing is plywood, insulated board, glass-fibre-faced exterior gypsum, or exterior gypsum board, use nails with plastic washers and brick tie anchors.

For steel-framed construction where the sheathing is glass-fibre-faced exterior gypsum or exterior gypsum, use screws with washers and brick tie fasteners.

All seams require a 100-mm minimum overlap, and both vertical and horizontal seams should be secured with a CCMC-evaluated sheathing tape.

Tyvek HomeWrap window and openings.
Figure 4. Tyvek® HomeWrap® window and openings
  1. outside view
  2. make an "I" cut in membrane (outside view)
  3. tape cut corners (inside view)
  4. fasten Tyvek® HomeWrap® (inside view)

The material must be cut and wrapped around framing at openings (see Figure 4). Cut ends should then be taped or caulked to the inside frame. To ensure continuity at this junction, a seal must be established with the window or door element (see Figure 5).

Tyvek HomeWrap window frame cross-section.
Figure 5. Tyvek® HomeWrap® window frame cross-section
  1. seal to window with sealant or foam compatible with Tyvek® HomeWrap® and wood/vinyl/aluminum frames
  2. Tyvek® HomeWrap®

The plane of airtightness of the material must be made continuous with windows and doors that are part of the air barrier system for the building envelope. The material must be sealed to the window or door frames with either sealant/backer rod or filled with sealant foam. Sealants must be compatible with the material and adhere to the framing material.

Tyvek HomeWrap exterior electrical boxes.
Figure 6. Tyvek® HomeWrap® exterior electrical boxes
  1. Tyvek® HomeWrap® installed on sheathing but not shown for clarity
  2. snap-on retainer
  3. airtight plastic box
  4. tape seal
  5. seal exterior electrical outlet boxes or use airtight plastic boxes

All exterior electrical boxes or other penetrations through the material must be rendered airtight to maintain the plane of airtightness of the air barrier system. All electrical boxes must be wrapped and taped to the product’s membrane, or airtight electrical boxes can be used.

Sealing at wall penetrations.
Figure 7. Sealing at wall penetrations
  1. Method one
    1. seal around opening
    2. air flow
    3. exhaust
    4. inside
    5. proprietary air barrier material around opening
  2. Method two
    1. trim proprietary air barrier material around opening and tape connection
    2. outside

Where pipes and ducts may breach the Tyvek® HomeWrap® – Air Barrier Material membrane, they must be sealed to the membrane. A sealant bead compatible with the product and the pipe or duct material or the CCMC-evaluated sheathing tape is recommended.

Administrative information


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.


Une version française de ce document est disponible.
In the case of any discrepancy between the English and French version of this document, the English version shall prevail.


© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2022

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.