Minimum Roof Pitch For Snow Loads

If you are adding an addition to your home or installing skylights knowing the existing pitch is important.

Minimum roof pitch for snow loads.

All commercial buildings and structures should use the ground snow load values from the 2009 ibc and not the residential design values given below. The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed.

The sloped roof snow load is calculated using equation 7 4 1. P s c s p f. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. A minimum slope of 1 inch per foot is recommended in snow country.

Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface. If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16. Roof design snow loads derived from figure 321 02 of the wisconsin. You can click on the map below to find the minimum roof design snow load for that location.