Roof Slope Grade

Roof pitch is the slope created by the rafter.

Roof slope grade.

Degrees to pitch rise in run table. Roof slope expressed as an angle. Understanding your roof s pitch and slope by knowing the pitch of your roof you will know what type of products can be used and the best ways to go about applying them. Roof slope rise in run roof slope degrees roof slope percentage 0 25 12.

4 76 8 33 grade. Why is the roof slope 25. A 3 in 12 roof rises 3 for every 12 of run. While roof slope is typically expressed in rise it can also be expressed in degrees or in percent of slope.

This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. Asphalt shingles continue to be the most widely installed roof covering option in north america. In general the minimum slope for a flat roof is 1 0 but as stated earlier this is only possible in theory. Slope as grade for an elevation of 1 m over a distance of 2 m can be calculated as.

Roof pitch multiplier table. That s the same as a 14 degree slope or a 25 slope. 3 12 1. You can find the roof pitch in the form of x 12 like 4 12 or 9 12.

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. 0 12. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. Roof slope expressed as rise run in inches.

Roof slope equivalents as rise. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Easy to walk on.

This will allow your project to carry the depth and detail in the roof that you wanted as well as make sure that it will maintain a sturdy and effective nature throughout. Since they vary in quality as well as method of installation the choice preferred for a flat roof will ultimately have an effect on the final slope of the flat roof. If you want to know how to find the pitch of a roof then start with a calculator. Even if you want to use a flat roof pitch calculator system you will be able to find one.

What is the minimum slope for an asphalt shingle roof. S grade 1 m 2 m 50 slope and roof pitch. It takes the manufacturer s recommendations the unique conditions of the roof as well as the skills and the expertise of the installer to arrive at the right slope.