About Low slope roofing installation

Asphalt shingles are an effective roof covering material for sloped roofs. They can be successfully used on "low sloped" roofs as well as steeper pitches. Typically any roof slope less than 4:12 (i.e. 4" of vertical rise for every 12" of horizontal run, or 18.5) is considered a low sloped roof. Asphalt shingles can be successfully applied to these lower slopes, providing a few special application procedures are followed. Asphalt shingles should never be applied to roof slopes below 2:12 (8.5).

All of the application steps used for shingles on steeper, standard roof slopes should also be followed when installing shingles on low [4:12 down to 2:12 (18.5 to 8.5)] slopes. For the finished roof to perform well, quality materials must be used and they must be installed properly, following the manufacturer's application instructions. This Technical Bulletin does not address all the good roofing practices needed for all roof slopes, but will highlight some of the major concerns of low sloped roofs.

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All contents of this page are taken from http://www.iko.com/misc/CasmaPdf/16-LowSlopedRoofs.PDF