Wind Lbs On Roof

As you might expect buildings of high importance such.

Wind lbs on roof.

Depending on the location a typical wind load is 80 mph or 16 lb ft2. Uplift load wind flow pressures that create a strong lifting effect much like the effect on airplane wings. The unit for wind pressure is pounds per square foot psf. Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the.

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. A typical uplift load limit assumes a maximum wind speed of about 90 miles per. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. For example if the wind speed is 70 mph the wind pressure is 0 00256 x 70 2 12 5 psf.

Wind flow under a roof pushes upward. Wind pressure is given by the equation p 0 00256 x v2 where v is the speed of the wind in miles per hour mph. Wind flow over a roof pulls upward. If your roof is located in windswept areas or even north of the treeline the wind will cause snow drifting making less of it accumulate on your roof.

Wind exerts three types of forces on a structure. Slipperiness of the roof.