Minimum Pitch For Felt Roof

Roof pitch defined and explained.

Minimum pitch for felt roof.

Importance of a roof pitch. Asphalt shingles require a minimum roof pitch of 2 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. That works out to about nine degrees if that works better for you.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Metal roof shingles require a minimum roof pitch of 3 12 or greater. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Using felt tiles is the next step up in quality.

What is the minimum pitch slope of an asphalt shingle roof. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. Let us recap on the minimum roof pitch required for each type of roofing material. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

However you can only use this pitch with built up roofing or specialized synthetic roofing. 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. 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.

Roof pitch designations are comprised of two numbers indicating a ratio. 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. In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood.

Pitch is the term used to describe the angle slope or slant of your roof. The minimum requirement is 2 12. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Roofing shingles are laid starting at the bottom of the roof. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. Rough cost m 2. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

Shingles of all types need to have a slope to function properly. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Asphalt shingles continue to be the most widely installed roof covering option in north america. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.