Low Sloped Trellis Roof

The standard of lower pitch actually ranges between 1 12 to 5 12.

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. A gable roof is shaped like an upside down v and is sometimes referred to as a dual pitched saddle saddleback or peaked roof. 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.

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. Modern low slope roof or flat roofs tend to use a continuous membrane covering which can better resist pools of standing water. 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. Asce 7 10 2015 ibc attributes ponding water to the deflection of relative flat roofs and identifies a susceptible bay for.

Then apply standard asphalt shingles over the membrane. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. Anything above that will require you to put out higher cost because they are already considered as higher pitch. For a low slope residential roof there are two main options.