CSA A123.21: Roof Assemblies Tested According to the Canadian Wind Uplift Resistance Standard
What Is the CSA A123.21 Standard?
The CSA A123.21 standard establishes stringent requirements for testing the wind uplift resistance of roof assemblies in Canada. This test protocol—developed by the SIGDERS consortium and published by the CSA Group—simulates the dynamic pressures exerted during extreme weather events to test the performance and durability of roofing systems.
At SOPREMA, we offer a comprehensive range of assemblies evaluated in accordance with this standard, designed to deliver performance, durability and safety in the harshest weather. In the United States, the Factory Mutual (FM) standard is often used to evaluate wind resistance, but it differs from Canadian requirements. In fact, compliance with the FM standard does not guarantee compliance with CSA A123.21, as required by the National Building Code of Canada. As a Canadian manufacturer, we ensure that our products are tested according to Canadian standards to guarantee their compliance and performance for our market. By combining accurate roof wind load calculations with our solutions tested according to CSA A123.21, you’ll achieve optimized performance tailored to each project.
Guide to CSA A123.21 Tested Roof Assemblies
To assist architects, engineers and designers in selecting high-performance systems, SOPREMA has created a guide that includes all of its roof assemblies tested in accordance with the CSA A123.21 standard. With this guide, professionals can save time, ensure the compliance of their designs, and choose a reliable solution suited to their project conditions.
Any Questions about CSA A123.21?
Our technical experts can guide you in choosing a compliant and effective system. Contact us for personalized support.
CSA A123.21 Roof Assemblies
Explore in detail the results of the dynamic tests conducted on our roofing systems.
SOPREMA Support: From Design to Protection of Your Roof
At SOPREMA, we understand that every roofing project has unique requirements. That’s why our technical specialists and representatives are available to support architects, engineers and contractors in their projects. We offer dedicated technical support to answer your questions and guide you towards the best performance and sustainability solutions for your project.
Furthermore, because a well-performing roof also needs to be protected, our roofing warranties give you long-term peace of mind, with coverage recognized throughout the industry.
SOPREMA’s Wind Uplift Testing Table
SOPREMA has taken an innovative step forward by integrating a wind uplift testing table directly into its facilities, making it possible to carry out in-house testing of the wind resistance of numerous roofing systems in accordance with the CSA A123.21 standard. This equipment reproduces in a controlled manner the actual wind exposure conditions undergone by roofs in order to ensure compliance with the requirements of the National Building Code and the CSA standard, thus further optimizing the performance of our assemblies.
Technical Alert
Don’t miss a single update! Subscribe to our technical alerts and receive our technical bulletins and the latest roofing systems tested according to the CSA A123.21 standard, directly by email.
Frequently Asked Questions
SOPREMA has compiled all of its assemblies tested according to the CSA A123.21 standard in a dedicated section of its website. There you will find a downloadable summary document of all assemblies tested with the different types of roofing systems (flameless, mechanically attached, adhesive-applied, and partially attached).
The FM standard assesses wind resistance using a static test procedure. Positive pressure is applied under the assembly, starting at 30 psf, then increased by 15 psf per level, each level held for one minute. The resistance level reached corresponds to the last completed applied pressure. An assembly must resist a pressure of at least 60 psf to be considered admissible.
In contrast, the CSA A123.21 standard uses a dynamic testing protocol that more accurately replicates actual wind gusts. The protocol consists of applying and releasing pressure over hundreds of cycles (bursts) for a minimum duration of approximately 2 hours. Suction (negative pressure) is applied above the assembly, and the starting pressure is set at a value that the assembly is expected to withstand. Unlike with the FM standard, there is no minimum threshold imposed.
Conformity with the CSA A123.21 standard is required for full compliance with the National Building Code, except in rare cases where the performance of a system can be verified otherwise (using a usage history or specific approvals).
This standard applies to membrane roofing systems that are not held in place by ballast. It makes no distinction as to the waterproofing technology used.
Absolutely. SOPREMA is currently the only company to carry out large-scale tests on concrete decks. The testing equipment also allows for the accurate evaluation of different types of substrates used on site, such as CLT (cross-laminated timber), in a manner representative of real-life conditions. SOPREMA is actively working to expand its range of tested systems. You can already consult on our website the list of several assemblies, including concrete decks, all tested on real slabs.
