Minimum Roof Slope For Snow

Minimum required roof slope for roofing materials.

Minimum roof slope for snow.

The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Roofing material or system. You can enter this value either as a ratio x 12 or as an angle whichever suits you better.

Minimum pitch for corrugated metal roof. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Determine the minimum slope of the roof based on the roofing material. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

People have been killed by snow avalanches sliding off roofs during big snow winters. On roof slopes between 4 12 and 6 12 rough textured roofing materials work best. In case a slope greater than this is necessary then a double underlayment application must be used as per the requirements of the international building code. If you are adding an addition to your home or installing skylights knowing the existing pitch is important.

9 46 built up roof asphalt. Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. Begin by measuring 12 inches on your level and marking it with a pencil. In 12 0 25 in 12 1 19 built up roof coal tar pitch.

They hold the snow in place and keep it from accumulating and then sliding off in large slabs that can be dangerous. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. If your roof is pitched enter the length and width of the flat area covered by the roof.

Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed.