Wind Load Calculations per NBCC (Canada Only)

Determination of design wind pressure used for wall member design

Referenced sources: NBC of Canada, Division B, Part 4 (Section 4.1.7) and User’s Guide – NBCC 2005 Structural Commentaries (Commentary I). The static procedure for structural components and cladding is used in the determination of the design wind pressure for loading normal to exterior wall members only.

Building limitations: Normal Importance Category 2 low-rise buildings of a specific minimum height-to-width ratio and a reference height of less than 20 m. NBCC , Commentary I (26).

Required inputs:

  1. Wind velocity pressure, q (kPa)

  2. Terrain type (Open, Rough and Intermediate)

  3. Eave height, heave (m)

  4. Ridge height, hridge (m)

  5. Member span (height), l (m)

  6. Tributary width for wind load (m)

  7. Distance from terrain change, Dist. (m)