Roof Slope For Snow

If your roof is pitched enter the length and width of the flat area covered by the roof.

Roof slope for snow.

Complete list of roofing types. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Metal roofing systems have a good track record of performance in harsh winter environments as long as they are properly designed. 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.

They would say use a low slope approximately 5 12 and keep the snow on. The key factors are usually snow loading requirements adequate slope and the use of snow guards when needed. Degrees to pitch rise in run table. In general determining the pitch of an existing roof is a simple calculation.

Roof slope equivalents as rise. 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. Roof pitch multiplier table. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.

Flat roofs are common with industrial buildings boasting wide roof spans and are also popular in dry climates for houses where there is no need for the roof to help disperse rain and snow. What exactly is roof slope. I e 4 inches of rise per 12 inches one foot of run. Even in these arid regions so called flat roofs are still installed with a slight pitch to keep water from pooling on top of the structure.

Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. This can be accomplished by measuring the number of inches the roof rises vertically for every 12 inches it extends horizontally. If these issues are addressed during the design stage and the roofing contractor does his job these systems will almost always perform as intended.

Roof slopes are most commonly defined by the rise over run ratio.