BCGBC4010A Apply structural principles to residential low-rise constructions

Structural principles - Loads

Primary loads

Wind pressure
A diagram shows the effects of wind pressure on a building. The left side of the building faces the wind. Wind exerts horizontal positive pressure on the vertical surfaces of a building, which face into the wind. An arrow points towards the house showing the wind direction.
Any roof surfaces that have a slope greater than 30 degrees which face into the wind also experience positive wind pressure at right angles to the roof. Arrows pointing to the roof show the effects of wind pressure.
Any roof surfaces that have a slope greater than 30 degrees which face away from the wind will experience negative wind pressure or suction. Arrows point away from the roof showing suction.
Wind exerts negative pressure or suction on the sides of a building which face away from the wind. An arrow points away from the house which shows Leeward.

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