Roof Slope And Snow Load

The final step in calculating the snow load is to multiply the volume of snow on the roof by its density.

Roof slope and snow load.

Snow load thickness 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. P s c s p f where. 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.

You can also find the load per square meter or square foot of roofing by opening the advanced mode. If you want to calculate these values by hand use the following formulas. 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. Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface.

Find the snow density. The sloped roof snow load is calculated using equation 7 4 1. Sloped roof snow loads i s when the roof slope is greater than 5 the roof is considered sloped. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.

Snow varies in weight depending on the density. Fresh powder weighs much less than wind packed drifts. 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. Before moving on multiply the area by the snow depth in feet to find the volume of snow on the roof.

C s roof slope factor. The sloped roof snow load ps is found by multiplying the the value of csdepends on such factors as the slope of the roof. Is the roof warm or cold. P s c s p f.