Roof Wind Zone

The north zone middle zone and the south zone are identified on the roof load zone map above.

Roof wind zone.

Has the lowest load. Per asce 7 10 buildings are composed of 5 different zones depending on the wind loading they are subjected to. End zones zone 2 have a higher load than zone 1. Interior zones zone 1 have the lowest load and account for about 80 of the roof surface.

This downward imposed load on the home is also known as the snow load. This translates to about 70mph in basic wind speeds. When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather. Roof loads are a downward vertical force on the home.

Corner zones zone 3 have the highest load. Here is a breakdown of what each wind zone rating means. The roof zone describes the amount of wind load that is subjected to the roof. Things get a bit more complicated for wind zones 2 and 3.

Zone 2 designed to resist wind speeds up to100 mph. Homes built for zone 1 should be able to resist horizontal wind loads of no less than 15 psf and upward roof lifting loads of no less than 9 psf. Zone 1 designed for the interior of the country where hurricanes are not expected. They represent the perimeter of the roof and account for approximately 15 of the roof surface.

These zones are defined as follows.