(2.5-in-12) 11.77° Concrete Tile, Barrel, Mission or Two-Piece 4-in-12 18.43° Concrete Tile, Barrel, Mission or Two-Piece (2.5-in-12) 11.77° Clay Tile, Barrel, Spanish or S-Shaped 4-in-12 18.43° Clay Tile, Barrel, Spanish or S-Shaped With Special Underlayment Requirements 2½-in-12 (0.125-in-12) 0.60° Clay Tile, Barrel, Mission or Two-Piece 4-in-12 18.43° Clay Tile, Barrel, Mission or Two-Piece With Special Underlayment Requirements 2-in-12 9.46° Built-Up Roof, Asphalt ¼-in-12 Or the International Residential Code Roofing Material or System Minimumĭegree Equivalent Asphalt Shingles 4-in-12 18.43° Asphalt Shingles Table: Minimum Acceptable Roof Pitches by CodeĪs required by the International Building Code Still, there’s no guarantee that they won’t, so you should always check with your local code authority in case there are local amendments to the code that affect required minimum roof slopes. The values given here (except for thatch) are taken from the model International Building Code, which forms the basis for almost every building code in the United States.Īlthough many jurisdictions adopt an amended version of the code, the amendments rarely have anything to do with roof slope. The following table shows the minimum required (allowable) roof slope for each type of roofing material mentioned in the code. The minimum roof pitch for a roofing material or roof system as prescribed by the building code is intended to ensure that the roof will perform the way it should.ĭue to the way different roofing materials or roof assemblies work to keep water out, some types of roofing simply don’t function properly if they are pitched too low (or too high, but that’s almost never an issue). (See the minimum roof pitch for all roof types in our chart below.) IntroductionĮvery type of roof has a minimum roof slope allowed by code. Wood Shingles & Shakes – Wood shingles have a minimum roof pitch of 3/12, while wood shakes have a minimum pitch requirement of 4/12.Slate Roofing – Roofing slates have a minimum required roof pitch of 4/12.The minimum roof pitch for all single-ply roofing is ¼-in-12. Single-ply roofing includes EPDM, PVC, and TPO membranes. Single-Ply Membranes – This is the most common type of low-slope (or “flat”) roof covering.Standing seam metal roofs can be installed on pitches as low as ¼-in-12 according to code. Non-soldered metal roof panels that do have lap sealant need a pitch of at least ½-in-12. Metal Roofing – Non-soldered metal roofing panels with no lap sealant have a minimum required pitch of 3/12.The minimum pitch is 2½-in-12 with a double application of underlayment. Clay & Concrete Tiles – Tile roofing normally requires a minimum pitch of 4/12.An asphalt shingle roof normally require a minimum pitch of 4-in-12 inches, but they can be installed on pitches down to 2/12 with a double application of underlayment. ![]() Asphalt Shingles – Shingles are not a waterproof roof system, they are a water-shedding roof system that uses gravity to quickly get water off the roof.It’s important to bridge the individual asphalt shingles to get an accurate reading. ![]() Using a slope finder to calculate roof pitch on a shingle roof.
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