Choosing a roofing system

Calculations for wind loads on roofs are described in the National Building Code of Canada (NBCC). These calculations can sometimes be very tedious. To simplify this task, the NRC (National Research Council of Canada) provides an online tool for the public to model the majority of cases of buildings under 150 ft.
This tool is available at the following web address: Wind-Roof Calculators on the Internet (Wind-RCI) – National Research Council Canada

Step 2: Search for an appropriate roof system

Since 2005, the NBCC refers to CSA A123.21 to determine if a roofing system can support the calculated wind loads.
The link below will give you access to the results and the description of the assemblies tested by EXP (unless stated otherwise).

Weighting factor: Whereas CSA A123.21-14 divided the measured result by 1.5 as reducing factor, CSA A123.21-20 suggests multiplying the measured result by 0.65.

No other security factor is required.