Understanding what a windward wind load pressure is versus a leeward wind load pressure can be confusing if you are not familiar with wind loads. So we will do our be to help you understand these wind load pressures better.
Note that the windward pressure varies along the height of the building and are the positive wind load pressures on a building and are pushing against the building or structure.
The leeward pressure is assumed to be constant and is the negative wind load pressures, thus pulling rather than pushing on the building.
Since the wind blows in one direction on structure the windward and leeward pressures also are applied in the same direction. The combined wind load pressure value is found by subtracting the negative leeward wind load pressure calculated value from the positive windward wind load pressure calculated value.