Snow Load Gable Roof Equation

Figure 7 1 pages 84 85 and table 7 1 page 92.

Snow load gable roof equation.

Length of high roof lu. γ 0 13p g 14 snow density. 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. 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.

From our example our ground load and flat roof snow load were found to be 30 psf and 21 psf respectively. Horizontal distance from eave to ridge. This web based application is made freely available courtesy of the advertisements displayed on this page. 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.

Provisions on how to calculate the snow drift surcharge for structures can be found in section 7 8 of asce 7 10. Ground snow load pg. Length of roof upwind of the snow drift. Using the following equations.

Our sample homes are in an area where the snow load is 50 pounds per square foot of roof area treat snow as live load. The sloped roof snow load p s shall be obtained by multiplying the flat roof snow load p f by the roof slope factor c s. P s c s p f. Minimum roof snow load after the single heavy snow storm eventually the wind blows thermal effects have time to act and we then get pson the roof.

Unbalanced snow loads are required for roof pitches between 1 2 on 12 to 7 on 12. It goes without saying that in a warmer climate the snow load probably would be less so you need to check your code book for live loads and dead loads in your region. Partial unbalanced and drift loading. Lets assume our project is in madison wisconsin and we have already calculated our balanced roof snow load here.

All loads are listed as pounds per square foot of. 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. Length of low roof ll. Medeek design assumes no liability or loss for any designs presented and does not guarantee fitness for use.

From eave to ridge w. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Snow loads acting on a sloping surface shall be assumed to act on the horizontal projection of that surface. It need not be used in determining or in combination with drift sliding unbalanced or partial loads.

This minimum roof load is a separate uniform load case. Length of roof downwind of the snow drift. The balanced snow load is applied everywhere where the roof structure is located.