Minimum Roof Slope For Snow

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.

Minimum roof slope for snow.

The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Minimum required roof slope for roofing materials. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. 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. Minimum pitch for corrugated metal roof.

Determine the minimum slope of the roof based on the roofing material. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. You can enter this value either as a ratio x 12 or as an angle whichever suits you better. If your roof is pitched enter the length and width of the flat area covered by the roof.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. 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. Begin by measuring 12 inches on your level and marking it with a pencil. Roofing material or system.

There are some opinions that standing seam metal roof minimum slope is 12 but it increases the possibility of leaking on the few first days of snow arrival. A minimum slope of 1 inch per foot is recommended in snow country. The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. 9 46 built up roof asphalt.

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