Minimum Roof Pitch For Snow Loads

It is determined based.

Minimum roof pitch for snow loads.

A pvc roof is a lot more durable and longer lasting that a conventional epdm rubber roofing system. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Per 2003 irc and 2003 ibc. Ground snow load value.

You could also opt for a pvc flat roofing membrane. For example 18 inches would be 1 5 feet. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. P s c s p f.

All commercial buildings and structures should use the ground snow load values from the 2009 ibc and not the residential design values given below. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012. The sloped roof snow load is calculated using equation 7 4 1.

If you are adding an addition to your home or installing skylights knowing the existing pitch is important. You can click on the map below to find the minimum roof design snow load for that location. Roof design snow loads derived from figure 321 02 of the wisconsin. First figure out how deep the snow is piled up there.

Discount that actual snow loads may exceed them only that the risk of snow load induced failure is reduced to an acceptably low level. Express the result in feet rather than inches. 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. Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface.

When the roof slope is greater than 5 the roof is considered sloped. 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. Begin by measuring 12 inches on your level and marking it with a pencil. The easiest way is to push a yardstick into the snow on the roof selecting an area that looks typical of the overall snow depth.