Roof Wind Zone

Corner zones zone 3 have the highest load.

Roof wind zone.

The north zone middle zone and the south zone are identified on the roof load zone map above. This zone accounts for approximately 80 of the roof surface represented in the interior zones of the roof. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. This translates to about 70mph in basic wind speeds.

End zones zone 2 have a higher load than zone 1. Has the lowest load. 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. 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 3 designed to resist wind speeds up to 110 mph. They represent the perimeter of the roof and account for approximately 15 of the roof surface. Per asce 7 10 buildings are composed of 5 different zones depending on the wind loading they are subjected to.

This downward imposed load on the home is also known as the snow load. Interior zones zone 1 have the lowest load and account for about 80 of the roof surface. Zone 2 designed to resist wind speeds up to100 mph. Here is a breakdown of what each wind zone rating means.

Zone 1 designed for the interior of the country where hurricanes are not expected.