Things get a bit more complicated for wind zones 2 and 3.
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.
Zone 1 designed for the interior of the country where hurricanes are not expected.
In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.
This zone accounts for approximately 80 of the roof surface represented in the interior zones of the roof.
Corner zones zone 3 have the highest load.
Zone 3 designed to resist wind speeds up to 110 mph.
End zones zone 2 have a higher load than zone 1.
They represent the perimeter of the roof and account for approximately 15 of the roof surface.
The roof zone describes the amount of wind load that is subjected to the roof.
Has the lowest load.
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.
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.
These zones are defined as follows.
Roof loads are a downward vertical force on the home.
Zone 2 designed to resist wind speeds up to100 mph.
Here is a breakdown of what each wind zone rating means.