Column 2. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. The minimum slope for an asphalt shingle roof is 2:12. For those who don’t understand the roof pitch number here is a way to envision it. Learn more about slope roof. This number corresponds to the number of inches of rise in a 12-foot run. Low slope application.

6 minimum pitch for tiled roof. There are differing opinions as to the minimum slope for a roof, but the generally accepted minimum is 3/12. Maximum Slope. Asphalt shingles shall be fastened to solidly sheathed decks.

For the smaller residential low slope roofing applications such as garage and porch transitions, CertainTeed offers an excellent solution in our Flintlastic SA, self-adhering SBS modified bitumen roofing system. The minimum roof slope for metal roofs is dependent upon the roof profile. Minimum Required Roof Slope for Roofing Materials; Roofing Material or System: Minimum Required Slope (X:12) Minimum Required Slope (Degrees) Asphalt Shingles: 4 : 12: 18.43° Asphalt Shingles (Special Underlayment) 2 : 12: 9.46° Built-Up Roof, Asphalt: ¼ : 12 (0.25 : 12) 1.19° Built-Up Roof, Coal Tar Pitch: ⅛ : 12 (0.125 : 12) 0.60°

Shingles of all types need to have a slope to function properly. 6.1 Underlayment and Ice Barriers: For roof slopes greater than 4:12, the roof deck must be covered with a minimum of one layer of underlayment as described in Sections 7.2 and 7.3 of this Report. The minimum requirement is 2/12. Built-up Roofing. Building Codes. IMPORTANT: For decks 3⁄4" (19 mm) thick or thicker, nails must go at least 3⁄4" (19 mm) into the deck. Re: Minimum Pitch For Shingles We use full ice and watershield with 3/12 pitch if there is fully vented soffit and ridgevent. The 2/12 number is rise over run or two units of vertical for every 12 units horizontal. 1 in 2. asphalt base (gravelled) 1 in 50 (1) 1 in 4. There are differing opinions as to the minimum slope for a roof, but the generally accepted minimum is 3/12.

1. So a 4/12 pitch roof rises 4 inches for every 12 inches of horizontal run. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Some roofers hold that the slope can be as low as 4/12. That works out to about nine degrees if that works better for you. Considering the roof slope requirement is important. If I use shingles on a low slope (2"- 4" on 12"), I use an ice and watershield underneath. Some people recommend not installing asphalt shingles on slopes below 5/12, but a skilled roofer may well be able to make this work. 1 in 3. no limit. minimum roof pitch for shingles It is important for shingle roofs to function properly, and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles.

If you desire a cedar roof for your home, the ideal pitch for your roof ranges from a five-pitch to a 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. What is the minimum Pitch/Slope of an Asphalt Shingle Roof? The roof pitch between 2:12 and 4:12 is considered as a low pitch roof, so shingles can be installed in the roof slope between 2:12 and 4:12. 7 minimum slope for asphalt shingles. Minimum Slope. Asbestos-cement Corrugated Sheets.