Wind Zone Map Roof

The manufactured home producer designs the home to resist the wind load which is measured in pounds per square foot.

Wind zone map roof.

Wind zone i equates to a 70 mph fastest mile wind speed. The zones relate to the severity of exposure to wind driven salt with b being low risk c medium risk and d high risk. The wind speed maps roof zones enclosure classifications and external pressure coefficients. 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.

Manufactured housing institute basic wind zone map. Simply put for the contiguous u s asce 7 05 has one wind speed map and it is based on allowable stress design. This chapter expands on. Things get a bit more complicated for wind zones 2 and 3.

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. 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. There are some noteworthy differences between the three asce 7 editions and they include. Zone 3 homes should be able to resist winds of up to 110 mph.

Anchorage in the 130 mph 58 m s wind zone shall be continuous from the roof to the foundation. Zone 2 consists of the county of worcester. The corrosion zones in branz maps are our interpretation of the exposure zones in nzs 3604 2011. 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. Homes built for wind zone 2 should be able to withstand winds up to 100 mph. The locations of wind load zones are shown in the figures 1611 1a 1611 1b 1611 1c maps. And zone 3 consists of the counties of essex middlesex suffolk norfolk plymouth.

The north zone middle zone and the south zone are identified on the roof load zone map above. Special inspections and tests. 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 downward imposed load on the home is also known as the snow load.

Wind zone i wind zone ii and wind zone iii are identified on the basic wind zone map above. Zone 1 consists of the counties of berkshire franklin hampshire and hampden. Wind zone ii equates to a 100 mph fastest mile wind speed.