Roof Slope And Snow Load

Before moving on multiply the area by the snow depth in feet to find the volume of snow on the roof.

Roof slope and snow load.

Find the snow density. Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface. Snow load thickness density. 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.

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. 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. Fresh powder weighs much less than wind packed drifts. You can also find the load per square meter or square foot of roofing by opening the advanced mode.

P s c s p f where. The thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is available below. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Sloped roof snow loads i s when the roof slope is greater than 5 the roof is considered sloped.

If you want to calculate these values by hand use the following formulas. Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. Is the roof warm or cold. The final step in calculating the snow load is to multiply the volume of snow on the roof by its density.

The sloped roof snow load is calculated using equation 7 4 1. Snow loads acting on a sloping surface shall be assumed to act on the horizontal projection of that surface. Snow varies in weight depending on the density. The sloped roof snow load ps is found by multiplying the the value of csdepends on such factors as the slope of the roof.