Roof Slope For Snow

This allows the snow to stay on while venting the roof system.

Roof slope for snow.

They then have the option of putting dormers on the roof without damage to the valleys penetrations lower roofs and property below due to sliding snow and ice. 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. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. On roof slopes between 4 12 and 6 12 rough textured roofing materials work best.

You can enter this value either as a ratio x 12 or as an angle whichever suits you better. Building a roof with wood shakes works well in moist colder climates as they don t dry out from the snow. At these slopes snow creeps rather than slides and is easy to manage. For warm roofs c t 1 0 as determined from table e 3 with an unobstructed slippery surface that will allow snow to slide off the eaves the roof slope factor c s shall be determined using the dashed line in fig.

Intuitively this is the number of inches of snow on your roof in the place where the cover is the thickest. E 2a provided that for nonventilated warm roofs their thermal resistance r value equals or exceeds 30 ft 2 h f btu 5 3 c m 2 w and for warm ventilated roofs their r value equals or exceeds 20 ft 2 h f btu 3 5 cm 2 w. If you live in a climate with cold winters and numerous snow storms a pitched roof will prevent the snow from remaining on the top of your home. The slope that works best seems to be 5 12.