Minimum Roof Slope For Snow

Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest.

Minimum roof slope for snow.

9 46 built up roof asphalt. 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. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Minimum pitch for corrugated metal roof.

They hold the snow in place and keep it from accumulating and then sliding off in large slabs that can be dangerous. If your roof is pitched enter the length and width of the flat area covered by the roof. Roofing material or system. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.

Minimum required roof slope for roofing materials. Determine the minimum slope of the roof based on the roofing material. 18 43 asphalt shingles with special underlayment requirements 2 in 12. On roof slopes between 4 12 and 6 12 rough textured roofing materials work best.

Begin by measuring 12 inches on your level and marking it with a pencil. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed. 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.

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

In 12 0 25 in 12 1 19 built up roof coal tar pitch.