Roof Design For Snow Load

The live load on a roof is the weight of any temporary objects on the roof.

Roof design for snow load.

Uniform design snow load on a building roof. The balanced snow load is applied everywhere where the roof structure is located. Roof snow load nbc 2010 roof snow load nbc 2010 version 0 1 0 september 13 2020. 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. Why snow load information. Town load town load aguilar 40 idaho springs 50 alamosa 20 ignacio 40. Residential roof with asphalt wood shingles or shakes would use fig.

Modify these basic loads for wind shape of roof drifting ice loads etc. 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. 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.

Maps of ground snow loads in ibc and in asce 7 indicate a 2 percent probability of the indicated load. Importance factor i s. Recommended basic snow design loads snow loads by city 1. 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.

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. Ground snow load is defined as the weight of snow on the ground. Loads are in pounds per square foot. Ground snow load values are established using data collected by the national weather service.

Calculate unbalanced snow load for hip and gable roofs as shown in asce figure 7 5 below. 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 your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. 7 4 1 7 4 4 and asce figure 7 2 below.

P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. Ground snow load s s. 7 2b with a c s 1 0 p f flat roof snow load in psf.