Minimum Pitch For Felt Roof

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

Minimum pitch for felt roof.

Or the colon can replace the slash as in 2 12 or 7 12. Metal roof shingles require a minimum roof pitch of 3 12 or greater. That works out to about nine degrees if that works better for you. The minimum requirement is 2 12.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Pitch is the term used to describe the angle slope or slant of your roof. Roof pitch defined and explained. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Importance of a roof pitch. Use a pitch of more than ten degrees for more efficient rain protection. The shingles overlap each other by about 150 mm at the ridge a capping piece is used. 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.

The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Felt tiles or roofing shingles.

Rough cost m 2. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Using felt tiles is the next step up in quality. However you can only use this pitch with built up roofing or specialized synthetic roofing.

In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood. Roof pitch designations are comprised of two numbers indicating a ratio. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 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.

Shingles of all types need to have a slope to function properly. The values given here. Let us recap on the minimum roof pitch required for each type of roofing material. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

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. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.