Minimum Functional Angle For Roof Shingles

Shingles of all types need to have a slope to function properly.

Minimum functional angle for roof shingles.

Learn what the minimum slope for an asphalt shingle roof is the difference between sloped and flat roofs and how to calculate the slope of any roof. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Determine the minimum slope of the roof based on the roofing material.

The requirements for an asphalt shingles roof are contained in the international building code. The minimum requirement is 2 12. Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope. Pitched roofs begin with with slopes greater than 3 in 12.

Mineral surfaced roll roofing minimum roof slope roof pitch r905 5 2. Metal roof shingles minimum roof slope roof pitch r905 4 2. The minimum pitch for a. The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used.

A minimum pitch of 3 in 12 or even 4 in 12 will normally be required. What is the minimum slope for an asphalt shingle roof. Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low slope or nearly flat roofs. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Suitable materials for pitched roofs. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.

Asphalt shingles continue to be the most widely installed roof covering option in north america. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Corrugated metal roofing has the same minimum pitch.

That works out to about nine degrees if that works better for you.