Draft Details

Designation:CSA A440.6
Review start date:Jul 18, 2019
Review end date:Sep 18, 2019
Contact email:sue.ruscetta(at)csagroup.org
Draft Scope/Description:


This Standard sets forth characteristics of effective and durable installation methods, in both new and existing buildings, of fenestration products within the scope of AAMA/WDMA/CSA 101/I.S.2/A440 that are intended for installation in high exterior exposure conditions.  High exposure conditions include high wind pressures and high driving rain wind pressures that apply to buildings of four or more storeys in height, and to buildings of any height located on steep slopes, near the crest of hills, or on escarpment where those locations have an exposure factor equal to or greater than 0.9 as defined in Sentence of NBC 2015, or where the height of a slope or escarpment from its base to its crest is more than 10 times the horizontal distance between the base and the crest as defined in Article of NBC 2015.


Reference should be made to CAN/CSA-A440.4 for recommended procedures for installation of Class R, LC and CW fenestration products into low-rise buildings.

Figure in NBC 2015 provides an illustration of the conditions considered high exposure with respect to slopes and escarpments.

In addition to fenestration products within the scope of AAMA/WDMA/CSA 101/I.S.2/A440, this standard also applies to:

the curtain wall (residential application and pre-glazed only) to wall interface, where the curtain wall is installed as a ribbon, strip or punched window;

window-walls; and

storefronts (where exposed to the exterior).

This standard applies to the installation of Class AW windows in any exposure. 

This standard covers the installation process from pre-installation procedures through to post-installation and includes fenestration design features that allow improved performance of products installed in high exposure conditions.  This standard also outlines processes related to fenestration installation, such as shop drawing review, field testing and mock-up testing, to improve the performance of the installed product.  Therefore, the provisions of this standard should be considered by responsible parties at the product design stage, at the building design stage, at the field installation stage and at the post-installation stage. 

This Standard provides minimum requirements for the installation of fenestration products in high exposure situations and where compliance is required to Part 5 of the National Building Code, or comparable requirement in applicable local codes.  This Standard addresses issues that could compromise the performance of the fenestration product as established by testing to the requirements of AAMA/WDMA/CSA 101/I.S.2/A440 or as otherwise required by Part 5 of the National Building Code. Where installation methods are not specifically addressed in this Standard, or where there are differences between this standard and installation instructions of the manufacturer of a fenestration product, a design professional should be consulted for a solution consistent with the intent of the minimum requirements and principles in this Standard and with the intent of Part 5 of the National Building Code or comparable section in applicable local codes.

This standard describes laboratory testing procedures for combination window assemblies, including window-walls.

The application of this Standard requires a working knowledge of applicable federal, provincial, and local (municipal) building codes and regulations specifically concerning, but not limited to, required means of egress, fire safety requirements, and requirements for safety glazing.

This Standard does not apply to

selection of fenestration products for a given application;

Note: For product performance selection information, see CSA A440S1.

selection of other products for use in the installation;

installation of storm windows or storm doors;

maintenance of installed fenestration products;

rebuilding of fenestration products;

fabrication of fenestration products, whether such fabrication takes place in a factory or at the installation site (i.e., stick-built assemblies);

fire-rated fenestration;

vehicular-access doors (garage doors);

commercial entrance systems;

revolving doors;

commercial steel utility doors (e.g., roof access doors or doors to electrical rooms);

sloped glazing (other than unit skylights, roof windows or tubular daylighting devices);

curtain wall (except for the interface detail between a wall of a residential application and a curtain wall installed as a ribbon/strip or punched window);

interior fenestration products;

sunrooms; and

balcony enclosures.

This Standard does not purport to address all of the safety problems associated with its use.  It does not set out requirements relating to the safety of the person installing the units.  It is the responsibility of the installer to obtain necessary health and safety training and to follow proper procedures for safe handling and application of installation materials and fenestration products. 

Note: Installers should be aware of existing hazardous materials, such as asbestos or lead paint.  It is recommended that installers request a copy of the designated substance survey for the building prior to commencing any work.

This standard is not intended to replace professional advice.  When information provided in this document is incorporated into buildings, it must be reviewed by knowledgeable building professionals and reflect the specific conditions and unique design parameters of each building.  Use of this standard does not relieve designers of their responsibility to comply with local building codes, standards and by-laws with respect to the selection, interface design, and installation of fenestration products.

This Standard assumes that its users are familiar with the terminology, procedures, and requirements of good building practice. Some requirements and guidance are included in this Standard, but the installer should also refer to information available from installation manuals and fenestration product manufacturers.

This Standard does not address the qualifications and skills that an installer should possess. It assumes familiarity with the fundamentals of building construction in Canada as described in Division B, Part 5 of NBC 2015 or equivalent local code and of installation techniques for fenestration products normally available in Canada. Although guidance is provided in the manner of installation of fenestration products, it is not a training manual.

Certification procedures are not part of this standard.

Annex H introduces the issue of climate change and its associated effects on fenestration in buildings. It is anticipated that fenestration designers will need to incorporate changes in climate loads resulting from climate change into fenestration product design. It is also anticipated that adjustments will need to be made to installation detailing. Annex H provides some information on these topics for consideration by building design professionals, authorities having jurisdiction, and installers. As information on climate change evolves, so too will the requirements of this Standard.

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.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

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