What is the minimum slope for a composition shingle roof?

Minimum Pitch/Slope of An Asphalt Shingle Roof Shingles of all types need to have a slope to function properly. The minimum requirement is 2/12. The 2/12 number is rise over run or two units of vertical for every 12 units horizontal.

What is the minimum slope for rolled roofing?

The minimum slope requirement for mineral-covered roll roofing material is half an inch per foot (4 percent). Organic roll roofing can be installed on roofs with a minimum slope of 1 inch and, while asphalt roll roofing can be installed on a 2-inch slope in an emergency, a minimum slope of 3 inches is recommended.

What is the maximum slope for rolled roofing?

5.2. Mineral-Surfaced Roll Roofing can only be installed on roof slopes of 1:12 or greater (8% Slope). This means for every 12 horizontal units, the roof must rise a minimum of 1 vertical unit.

What is minimum slope requirements?

General Minimum Roof Pitch Standards The minimum roof slope allowed by code for any type of roof is ⅛-in-12 (0.60 degrees), applicable only to coal tar pitch roof systems. All other flat roof materials require a minimum slope of ¼-in-12, which is why flat roofs are properly known as “low-slope” roofs.

Can you put asphalt shingles on a 1/12 pitch roof?

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.

Can I use shingles on a low pitch roof?

Shingles can be installed on low-sloped roofs with a pitch of 3/12 inches. However, it will require additional layers under the shingles, such as a double layer of asphalt-saturated felt paper or a single layer of ice and water shield.

Can shingles be used on low pitch roof?

Most shingles may be applied on roof slopes of 2:12 to 4:12 (a “low slope” roof), providing that the shingles are adequately sealed against wind lift, and special procedures are followed. In many building codes, allowances are made to permit applications of asphalt shingles to low sloped roofs.

Can you shingle a 1/12 pitch roof?

What shingles are best for a low slope roof?

The slope or pitch of a roof dictates the type of shingles you should install. For a low-slope roof such as 4:12 to 2:12, three-tap shingles are preferable. Low-slope roofs are more susceptible to ice and water problems such as ice dams, so better flow properties are important to consider for installation.