Minimum Roof Pitch For Felt Shingles

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

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. 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. Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed.

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. Shingles of all types need to have a slope to function properly. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

Minimum required roof slope for roofing materials. That works out to about nine degrees if that works better for you. Asphalt shingles continue to be the most widely installed roof covering option in north america. 9 46 built up roof asphalt.

Roofing material or system. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Let us recap on the minimum roof pitch required for each type of roofing material. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

Using felt tiles is the next step up in quality. 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. Metal roof shingles require a minimum roof pitch of 3 12 or greater.

Roofing shingles are laid starting at the bottom of the roof. Asphalt shingles require a minimum roof pitch of 2 12 or greater. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 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.

Felt tiles or roofing shingles. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. Asphalt felt paper that is tacked to the roof sheathing. The minimum requirement is 2 12.

What is the minimum pitch slope of an asphalt shingle roof.