Home

Steps 1 and 2

Step 1

Determine the wind classification.

This example assumes that the wind classification is N2 33 m/s. This would have been provided by a consultant.

Step 2

Determine the wind pressure (for both wind directions wind 1 and wind 2 in the diagrams).

The required information is:

  • the roof pitch (in this example it is 20º)
  • the width of the building
  • whether there are any flat walls, skillion ends or gable ends.

These details can be found in Table 8.1 and Table 8.2 in AS 1684.2.

Diagram of a gable end house. An double-headed arrow labelled 1 is directed along the length of the house.

Wind classification is N2
Pressure is 0.92 kPa according to Table 8.1        
Diagram of a gable end house. An double-headed arrow labelled 2 is directed across the width of the house.

Wind classification is N2 (roof pitch is 20º)
Pressure is 0.6 kPa according to Table 8.2