Roof Angle For Snow

In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.

Roof angle for snow.

In snowy areas your roof should be at least 10 12 40 to allow snow to shed while the safest roof pitch in very windy areas is between 4 12 6 12 18 5 26 5. On multiple factors including. If water does not properly run off of a roof it will begin to seep in causing rot interior damage and possibly dangerous black mold. The purpose of pitching a roof is to enable water and snow to run off so the greater the amount of rain and or snow an area receives the greater the amount of pitch needed for the roof.

Pitch angle incline slope they all can be used to refer to the steepness of a roof. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. If you re not sure which type to choose always settle for the wetter types as they are denser. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

For example a roof with a 6 inch 12 pitch is one where it rises 6 inches vertically for every 12 inches of the horizontal run. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. For slopes below 20 degrees systems such as epdm fibreglass metal roofing can be used. You can enter this value either as a ratio x 12 or as an angle whichever suits you better.

The requirements for an asphalt shingles roof are contained in the international building code. In general determining the pitch of an existing roof is a simple calculation. Importance occupancy and use of the building. The density of snow depends on whether it s fresh wet wind packed or mixed with ice.

Visit the shed roofing page. Wind exposure of roof. Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. For lots more information on which roof finish to use for which slope and indicative costs.

Ground snow load value. It is determined based.