Wind Zone Map Roof

Manufactured housing institute basic wind zone map.

Wind zone map roof.

The zones relate to the severity of exposure to wind driven salt with b being low risk c medium risk and d high risk. Things get a bit more complicated for wind zones 2 and 3. The wind speed maps roof zones enclosure classifications and external pressure coefficients. 780 cmr 1611 0 wind load 1611 1 wind load zones.

In 3280 305 c 1 ii b there is a comprehensive table listing all the requirements. Simply put for the contiguous u s asce 7 05 has one wind speed map and it is based on allowable stress design. Wind zone i wind zone ii and wind zone iii are identified on the basic wind zone map above. The manufactured home producer designs the home to resist the wind load which is measured in pounds per square foot.

This downward imposed load on the home is also known as the snow load. Homes built for wind zone 2 should be able to withstand winds up to 100 mph. Building for a wind zone. Wind zone i equates to a 70 mph fastest mile wind speed.

Chapter 17 provides a variety of procedures and criteria for testing materials and assemblies labeling materials and assemblies and special inspection of structural assemblies. The locations of wind load zones are shown in the figures 1611 1a 1611 1b 1611 1c maps. If you re thinking about buying a prefab home keep in mind that a home built to wind zone 1 cannot be placed by the manufacturer in zones 2 or 3 but a home built to wind zone 3 standards can be placed in lower wind zones. This chapter expands on.

There are some noteworthy differences between the three asce 7 editions and they include. Roof assemblies in the 130 140 and 150 mph 58 m s 63 m s and 67 m s wind zones as established in table r301 2 1 shall have rafter or truss ties provided in accordance with either table r4508 2 or the prescriptive requirements of section r4508. And zone 3 consists of the counties of essex middlesex suffolk norfolk plymouth. Anchorage in the 130 mph 58 m s wind zone shall be continuous from the roof to the foundation.

Zone 3 homes should be able to resist winds of up to 110 mph. Zone 2 consists of the county of worcester. Three exposure zones zone b zone c and zone d are shown on a map of the north and south islands in figure 4 2 of nzs 3604 2011. Zone 1 consists of the counties of berkshire franklin hampshire and hampden.

Wind zone ii equates to a 100 mph fastest mile wind speed. The north zone middle zone and the south zone are identified on the roof load zone map above. 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.