Minimum Roof Pitch For Felt Shingles

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.

Minimum roof pitch for felt shingles.

All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles require a minimum roof pitch of 2 12 or greater. Shingles of all types need to have a slope to function properly.

The shingles overlap each other by about 150 mm at the ridge a capping piece is used. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Installation on roof slopes below a 2 in 12 pitch is not recommended at all.

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. For roof slopes of four units vertical in 12 units horizontal 33 percent slope or greater underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion parallel to and starting from the eaves and lapped 2 inches 51 mm fastened only as necessary to hold in place. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. Asphalt shingles continue to be the most widely installed roof covering option in north america.

Using felt tiles is the next step up in quality. The minimum requirement is 2 12. Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed. Rough cost m 2.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Roofing shingles are laid starting at the bottom of the roof. Let us recap on the minimum roof pitch required for each type of roofing material.

Felt tiles or roofing shingles. Asphalt felt paper that is tacked to the roof sheathing. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. 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.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Minimum required roof slope for roofing materials. What is the minimum pitch slope of an asphalt shingle roof. 9 46 built up roof asphalt.

Roofing material or system.