Low Sloped Trellis Roof

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.

Low sloped trellis roof.

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 reason water ponds on a low slope roof is a possible misinterpretation of the 1 4 in 12 minimum slope by the building code. For a low slope residential roof there are two main options.

Asce 7 10 2015 ibc attributes ponding water to the deflection of relative flat roofs and identifies a susceptible bay for. 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. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. The membrane will outlast the shingles and seal around all nail penetrations.

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. Then apply standard asphalt shingles over the membrane. The standard of lower pitch actually ranges between 1 12 to 5 12.