Roof Wind Zone

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 north zone middle zone and the south zone are identified on the roof load zone map above. Per asce 7 10 buildings are composed of 5 different zones depending on the wind loading they are subjected to.

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Roof loads are a downward vertical force on the home.

Roof wind zone.

Zone 3 designed to resist wind speeds up to 110 mph. Has the lowest load. This zone accounts for approximately 80 of the roof surface represented in the interior zones of the roof. 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.

Here is a breakdown of what each wind zone rating means. This translates to about 70mph in basic wind speeds. Interior zones zone 1 have the lowest load and account for about 80 of the roof surface. Things get a bit more complicated for wind zones 2 and 3.

End zones zone 2 have a higher load than zone 1. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. These zones are defined as follows. The roof zone describes the amount of wind load that is subjected to the roof.

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. Corner zones zone 3 have the highest load. This downward imposed load on the home is also known as the snow load.

Zone 2 designed to resist wind speeds up to100 mph.

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