Asphalt shingles require a minimum roof pitch of 2 12 or greater.
Minimum pitch for felt roof.
Using felt tiles is the next step up in quality.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
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.
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.
Roof pitch defined and explained.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Use a pitch of more than ten degrees for more efficient rain protection.
The values given here.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.
Pitch is the term used to describe the angle slope or slant of your roof.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Felt tiles or roofing shingles.
Let us recap on the minimum roof pitch required for each type of roofing material.
The minimum requirement is 2 12.
What is the minimum pitch slope of an asphalt shingle roof.
Roofing shingles are laid starting at the bottom of the roof.
In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
Rough cost m 2.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Shingles of all types need to have a slope to function properly.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
The shingles overlap each other by about 150 mm at the ridge a capping piece is used.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
Or the colon can replace the slash as in 2 12 or 7 12.
Roof pitch designations are comprised of two numbers indicating a ratio.
The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
