Minimum Roof Pitch For Snow Loads

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Minimum roof pitch for snow loads.

The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. You can click on the map below to find the minimum roof design snow load for that location. You can safely measure the roof pitch from inside your attic with a level that is either 18 or 24 inches a tape measure and a pencil. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

The sloped roof snow load is calculated using equation 7 4 1. All commercial buildings and structures should use the ground snow load values from the 2009 ibc and not the residential design values given below. Begin by measuring 12 inches on your level and marking it with a pencil. If you are adding an addition to your home or installing skylights knowing the existing pitch is important.

When the roof slope is greater than 5 the roof is considered sloped. Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface. Roof design snow loads derived from figure 321 02 of the wisconsin. A minimum slope of 1 inch per foot is recommended in snow country.