![]() Thermoset single-ply roofing should be installed on roof slopes 0.25:12 or greater (2015 IRC R905.12.1).Modified bitumen roofing should be installed on roof slopes 0.25:12 or greater (2015 IRC R905.11.1).minimum roof slope of 0.25:12 for standing-seam roof systems. ![]() minimum roof slope of 0.5:12 for lapped, nonsoldered-seam metal roofs with lap sealant applied.minimum roof slope of 3:12 for lapped, nonsoldered-seam metal roofs without lap sealant applied.Metal roof panels should be installed on roof slopes according to particular seams (2015 IRC R905.10.2):.Built-up roofs should be installed on roof slopes 0.25:12 or greater (2015 IRC R905.9.1), except for coal-tar built-up roofs that have a minimum roof slope of one-eighth unit vertical in 12 units horizontal (1% slope).Wood shakes should be installed on roof slopes 3:12 or greater (2015 IRC R905.8.2).Wood shingles should be installed on roof slopes 3:12 or greater (2015 IRC R905.7.2).Slate shingles should be installed on roof slopes 4:12 or greater (2015 IRC R905.6.2).Mineral-surfaced roll roofing should be installed on roof slopes 1:12 or greater (2015 IRC R905.4.2). ![]() ![]()
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