Minimum Pitch For Felt Roof

Asphalt shingles require a minimum roof pitch of 2 12 or greater.

Minimum pitch for felt roof.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Pitch is the term used to describe the angle slope or slant of your roof. The shingles overlap each other by about 150 mm at the ridge a capping piece is used. In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The values given here. A flat roof is more likely to allow rain to pool and this can cause damage especially if the roof is made of a porous substance like wood. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

Roof pitch designations are comprised of two numbers indicating a ratio. Using felt tiles is the next step up in quality. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

That works out to about nine degrees if that works better for you. Roofing shingles are laid starting at the bottom of the roof. The minimum requirement is 2 12. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. However you can only use this pitch with built up roofing or specialized synthetic roofing. Use a pitch of more than ten degrees for more efficient rain protection. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions. Rough cost m 2. Let us recap on the minimum roof pitch required for each type of roofing material.

Shingles of all types need to have a slope to function properly. The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof. Or the colon can replace the slash as in 2 12 or 7 12. Roof pitch defined and explained.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. What is the minimum pitch slope of an asphalt shingle roof. Felt tiles or roofing shingles.