Minimum Roof Pitch For Rolled Roofing

Roof pitch designations are comprised of two numbers indicating a ratio.

Minimum roof pitch for rolled roofing.

Pitch is the term used to describe the angle slope or slant of your roof. Wood shakes require a minimum roof pitch of 3 12 or greater. If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof. Roof slope equivalents as rise.

3 12 minimum roof slope for metal roof panels with nonsoldered seams. 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. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.

Roof pitch multiplier table. The minimum roof slope for metal roofs is dependent upon the roof profile. Slate and slate type shingles require a minimum roof pitch of 4 12 or greater. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.

Roof pitch defined and explained. Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. Functional pitch the function of the roof in weather and the environment determines the minimum pitch for a roof.

You could also opt for a pvc flat roofing membrane. Otherwise the safest minimum pitch for rolled roofing is 2 inches of decline per 12 inches of horizontal direction 2 12 pitch. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Wood shingles require a minimum roof pitch of 3 12 or greater.

Complete list of roofing types. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater. If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally 1 12 pitch it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening.

Minimum pitch for metal roof. Degrees to pitch rise in run table. 2 1 2 12 minimum roof slope for clay and concrete tile. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv.

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. Built up roofs require a minimum roof pitch of 1 4 12 or greater. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing.

Normal roof slope for typical installation.