Psf Roof Load Shed Roof

The water content of snow may range from 3 for very dry snow to 33 for a wet heavy snow to nearly 100 for ice.

Psf roof load shed roof. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. Arch 331 note set 13 1 s2014abn 5 location 2uniform load psf kn m roofs ordinary flat pitched and curved roofs roofs used for roof gardens. Factors that influence. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof.

Here each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load 65 psf total to the structural support system. Per horizontal square foot is expected to support nearly 12 inches of wet heavy snow. See figure 1 headers. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of.

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. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters. Thus a roof designed to carry a snow load of 20 lbs.

Many factors influence how a system responds to loading. For example appendix a indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf. An inch of water depth weighs 5 2 lbs. It is measured in pounds per square foot psf.

To figure out the load on your roof take the depth of snow in feet and multiply it by the weight of a cubic foot of snow. All loads are listed as pounds per square foot of horizontal projection footprint area.