This calculator was originally developed by the Special Interest Group for Dynamic Evaluation of Roofing Systems (SIGDERS) consortia and focused only on wind load determination for roof claddings. This version also determines the wind load of roof claddings and vegetated roof assembly based on the National Building Code of Canada 2015, subsection 4.1.7. The calculations are performed conservatively by assuming the unit tributary area for various zones of cladding. However, the calculation follows ultimate limit states (ULS) design requirements and uses a principal wind load factor of 1.4 (refer to the National Building Code of Canada 2015, Division B, Table 220.127.116.11.A).
The calculators have been developed and are maintained by the National Research Council of Canada.
The licence agreement must be read and accepted before being able to use the Wind load calculators.