Roof Design For Snow Load

Town load town load aguilar 40 idaho springs 50 alamosa 20 ignacio 40.

Roof design for snow load. The live load on a roof is the weight of any temporary objects on the roof. Why snow load information. 7 2b with a c s 1 0 p f flat roof snow load in psf. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the.

If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Calculate unbalanced snow load for hip and gable roofs as shown in asce figure 7 5 below. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil. The balanced snow load is applied everywhere where the roof structure is located.

Use only within immediate vicinity of given town particularly if ground elevation changes noticeably. Importance factor i s. Ground snow load is defined as the weight of snow on the ground. Recommended basic snow design loads snow loads by city 1.

Modify these basic loads for wind shape of roof drifting ice loads etc. After you obtain the roof slope factor from those sections in asce 7 10 the balanced design snow load for the sloped roof can easily be calculated using equation 7 4 1. If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16. Loads used in design load equations are given letters by type.

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. P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure. Maps of ground snow loads in ibc and in asce 7 indicate a 2 percent probability of the indicated load.

Rain load s r. If your structure has a sloped or flat roof you still need to calculate the flat roof snow load. A great deal of confusion currently exists among engineers architects recreation specialists and maintenance personnel concerning the proper snow loading to use for the design and maintenance of trail bridges building roofs and other structures in mountainous high snow load areas. Roof snow load nbc 2010 roof snow load nbc 2010 version 0 1 0 september 13 2020.

Loads are in pounds per square foot. Residential roof with asphalt wood shingles or shakes would use fig. Ground snow load s s.