Roof Slope Factor Snow Load

Overestimation of snow loads can unnecessarily increase the cost of construction.

Roof slope factor snow load.

Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. If your structure has a sloped or flat roof you still need to calculate the flat roof snow load. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. 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.

Snow loads roof snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof configuration and wind direction and severity. All of the load cases required to fully design an actual structure are not provided by this. 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. Online snow load calculator for buildings with flat or low slope roofs for balanced.

Technically you should use the actual rafter length when adding up the weight of roofing materials. Roof snow load nbc 2010 version 0 1 0 september 13 2020. S 1 0 1 0 8 1 0 1 1 0 1 1 8kpa s 1 8 kpa s 37 6 psf. 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.

Slope 30 degrees. 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. You can also find the load per square meter or square foot of roofing by opening the advanced mode. This is the snow load calculated in the previous section.

Snow load thickness density. The balanced snow load is applied everywhere where the roof structure is located. If you want to calculate these values by hand use the following formulas. 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.

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.