Roof Slope Factor Snow Load

P s c s p f 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 the eaves to accept all the sliding snow.

Roof slope factor snow load.

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. You can also find the load per square meter or square foot of roofing by opening the advanced mode. Online snow load calculator for buildings with flat or low slope roofs for balanced. Once you know these values our snow load calculator automatically finds the total weight of snow on your roof.

Roof snow load nbc 2010 version 0 1 0 september 13 2020. Roof slope 0 degrees slope factor. 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.

This is the snow load calculated in the previous section. Technically you should use the actual rafter length when adding up the weight of roofing materials. Overestimation of snow loads can unnecessarily increase the cost of construction. If your structure has a sloped or flat roof you still need to calculate the flat roof snow load.

C s 1 uls. All of the load cases required to fully design an actual structure are not provided by this. 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 you want to calculate these values by hand use the following formulas.

For dead loads you are correct. Snow loads roof snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof configuration and wind direction and severity. S 1 0 1 0 8 1 0 1 1 0 1 1 8kpa s 1 8 kpa s 37 6 psf. 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.

Boca also allows you to reduce the snow load for roofs with slopes greater than 30 degrees presumably because snow will slide or blow off steeply pitched roofs.