Minimum Pitch For Felt Roof

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Minimum pitch for felt roof.

Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. That works out to about nine degrees if that works better for you. Metal roof shingles require a minimum roof pitch of 3 12 or greater. 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.

Importance of a roof pitch. 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. Use a pitch of more than ten degrees for more efficient rain protection. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. Pitch is the term used to describe the angle slope or slant of your roof. Roof pitch designations are comprised of two numbers indicating a ratio. The minimum requirement is 2 12.

Felt tiles or roofing shingles. Shingles of all types need to have a slope to function properly. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood.

What is the minimum pitch slope of an asphalt shingle roof. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. The values given here.

Asphalt shingles require a minimum roof pitch of 2 12 or greater. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Using felt tiles is the next step up in quality. Roofing shingles are laid starting at the bottom of the roof.

Asphalt shingles continue to be the most widely installed roof covering option in north america. The shingles overlap each other by about 150 mm at the ridge a capping piece is used. Roof pitch defined and explained. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Rough cost m 2. The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.