Roof Slope Factor Snow Load

If your structure has a sloped or flat roof you still need to calculate the flat roof snow load.

Roof slope factor snow load.

Online snow load calculator for buildings with flat or low slope roofs for balanced. Roof snow load nbc 2010 version 0 1 0 september 13 2020. Slope 30 degrees. All of the load cases required to fully design an actual structure are not provided by this.

Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Roof slope 0 degrees slope factor. 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. 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. You can also find the load per square meter or square foot of roofing by opening the advanced mode. C s 1 uls.

The balanced snow load is applied everywhere where the roof structure is located. Overestimation of snow loads can unnecessarily increase the cost of construction. Snow load thickness density. For dead loads you are correct.

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. This is the snow load calculated in the previous section. Snow loads roof snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof configuration and wind direction and severity. Technically you should use the actual rafter length when adding up the weight of roofing materials.

If you want to calculate these values by hand use the following formulas.