#STANDING SEAM METAL ROOFS RESIDENTIAL CODE#
The lowest roof pitch allowed by code for any type of roof is ⅛-in-12 (0.60 degrees), applicable only to coal tar pitch roof systems. Long-term ponding water is detrimental to almost every type of roofing material. On a dead-level roof, the slightest bit of deck deflection or any obstruction will lead to water ponding in place on top of the roof. Some minimum amount of slope is required to ensure that water will drain off the roof. Minimum Roof Pitch for Low-Slope RoofsĪ truly flat roof with zero slope (a dead-level roof) is both undesirable and generally prohibited by 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.A 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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