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.](images/page_002_wind_direction_1_house.gif)
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.](images/page_002_wind_direction_2_house.gif)
Wind classification is N2 (roof pitch is 20º)
Pressure is 0.6 kPa according to Table 8.2