Minimum Roof Pitch For Felt Shingles

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Minimum roof pitch for felt shingles.

All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. Asphalt felt paper that is tacked to the roof sheathing. It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. Roofing material or system.

The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. Minimum required roof slope for roofing materials. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Installation on roof slopes below a 2 in 12 pitch is not recommended at all.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed. The shingles overlap each other by about 150 mm at the ridge a capping piece is used. Roofing shingles are laid starting at the bottom of the roof.

That works out to about nine degrees if that works better for you. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used. Metal roof shingles require a minimum roof pitch of 3 12 or greater. Shingles of all types need to have a slope to function properly. For the rest of the roof slope the felt underlayment must be installed with a 19 inch top lap and a 12 inch side lap providing double coverage of the felt layer.

Felt tiles or roofing shingles. 9 46 built up roof asphalt. What is the minimum pitch slope of an asphalt shingle roof. Let us recap on the minimum roof pitch required for each type of roofing material.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Using felt tiles is the next step up in quality. Rough cost m 2. But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope.

The minimum requirement is 2 12.