Roofing Wind Zone Map

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

Roofing wind zone map.

Zone 1 consists of the counties of berkshire franklin hampshire and hampden. The wind speed maps roof zones enclosure classifications and external pressure coefficients. The locations of wind load zones are shown in the figures 1611 1a 1611 1b 1611 1c maps. Our map shows wind exposure and terrain adjustment factors based on the wind load provisions in the american society of civil engineers asce s minimum design loads of buildings and other structures asce 7.

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. Simply put for the contiguous u s asce 7 05 has one wind speed map and it is based on allowable stress design. 780 cmr 1611 0 wind load 1611 1 wind load zones. Our wind load factors map is a resource for engineers designing structures for wind loads in seattle.

This downward imposed load on the home is also known as the snow load. The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot. Chapter 17 provides a variety of procedures and criteria for testing materials and assemblies labeling materials and assemblies and special inspection of structural assemblies. Wind maps by county all wind maps are in pdf format.

A current wind map was not provided by the county please contact the local government building department for wind speed information. This chapter expands on. Windspeedbyzip is a tool for architects engineers and builders to easily determine the 3 second gust basic windspeed figure 6 1 of asce 7 05 and now design wind speed per asce 7 10 maps for any location in the continental united states to determine the basic windspeed fill in the address below. Has the lowest load.

In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. You only need to fill in either the city and state or the zip code. Wind zone i wind zone ii and wind zone iii are identified on the basic wind zone map above. Those counties are calhoun dixie flagler nassau.

Per asce 7 10 buildings are composed of 5 different zones depending on the wind loading they are subjected to. These zones are defined as follows. Zone 2 consists of the county of worcester. And zone 3 consists of the counties of essex middlesex suffolk norfolk plymouth.

Therefore maps are provided of rainfall seismic snow and wind criteria in different regions. There are some noteworthy differences between the three asce 7 editions and they include. Wind zone i equates to a 70 mph fastest mile wind speed. This zone accounts for approximately 80 of the roof surface represented in the interior zones of the roof.

Special inspections and tests. Wind zone ii equates to a 100 mph fastest mile wind speed.