Roof Wind Zone

Things get a bit more complicated for wind zones 2 and 3.

Roof wind zone. Has the lowest load. The roof zone describes the amount of wind load that is subjected to the roof. Corner zones zone 3 have the highest 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. Zone 2 designed to resist wind speeds up to100 mph. Interior zones zone 1 have the lowest load and account for about 80 of the roof surface. The north zone middle zone and the south zone are identified on the roof load zone map above.

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. Zone 1 designed for the interior of the country where hurricanes are not expected. Per asce 7 10 buildings are composed of 5 different zones depending on the wind loading they are subjected to.

They represent the perimeter of the roof and account for approximately 15 of the roof surface. This downward imposed load on the home is also known as the snow load. End zones zone 2 have a higher load than zone 1. This translates to about 70mph in basic wind speeds.

Zone 3 designed to resist wind speeds up to 110 mph.