Roof Design For Snow Load

If your structure has a sloped or flat roof you still need to calculate the flat roof snow load.

Roof design for snow load.

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. 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. Modify these basic loads for wind shape of roof drifting ice loads etc. Residential roof with asphalt wood shingles or shakes would use fig.

Uniform design snow load on a building roof. Recommended basic snow design loads snow loads by city 1. Loads are in pounds per square foot. Loads used in design load equations are given letters by type.

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. Use only within immediate vicinity of given town particularly if ground elevation changes noticeably. 7 2b with a c s 1 0 p f flat roof snow load in psf. The live load on a roof is the weight of any temporary objects on the roof.

Ground snow load is defined as the weight of snow on the ground. 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. 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. The balanced snow load is applied everywhere where the roof structure is located.

Rain load s r. 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. Town load town load aguilar 40 idaho springs 50 alamosa 20 ignacio 40. Maps of ground snow loads in ibc and in asce 7 indicate a 2 percent probability of the indicated load.

P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. Ground snow load s s. Calculate unbalanced snow load for hip and gable roofs as shown in asce figure 7 5 below. Importance factor i s.

If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Ground snow load values are established using data collected by the national weather service. Roof snow load nbc 2010 roof snow load nbc 2010 version 0 1 0 september 13 2020.