Low Sloped Trellis Roof

Then apply standard asphalt shingles over the membrane.

Low sloped trellis roof.

A low sloped roof or flat roof can t depend upon the water to flow in any particular direction so it must form a watertight monolithic membrane that stays watertight all the way to the drains or edge. Anything above that will require you to put out higher cost because they are already considered as higher pitch. The gentle slope of a hip roof with its trapezoidal sides and pyramid like elegance is a graceful traditional design that pleases the eyes and can be constructed in a combination of various unique styles. The reason water ponds on a low slope roof is a possible misinterpretation of the 1 4 in 12 minimum slope by the building code.

Asce 7 10 2015 ibc attributes ponding water to the deflection of relative flat roofs and identifies a susceptible bay for. For a low slope residential roof there are two main options. Modern low slope roof or flat roofs tend to use a continuous membrane covering which can better resist pools of standing water. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.

Significant insight may be found in asce 7 section 8 4 as referenced in ibc section 1611 2. The standard of lower pitch actually ranges between 1 12 to 5 12. If you have a low slope roof but would love to have a shingled look rather than other solutions like rolled sheet roofing you are in luck. Gaf asphalt shingles combined with the proper underlayment make ideal low slope roof shingles that do an excellent job of preventing water build up and leaking.