Least Roof Pitch

The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope.

Least roof pitch.

The smallest pitch of a roof is 0 5 12. Most roof s have a pitch in the 4 12 to 9 12 range. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Minimum roof pitch the minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

In roofing it is expressed in inches of vertical rise over inches of horizontal run. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Shingles of all types need to have a slope to function properly.

Common roof pitches and equivalent grade degree and radian angles. Roof pitches with lower angles such as 1 12 up to 3 12 are found in more urban contemporary style houses and in industrial buildings and shacks. There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch the most obvious of which is the roof s ability to shed or withstand. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.

In snowy areas your roof should be at least 10 12 40 to allow snow to shed while the safest roof pitch in very windy areas is between 4 12 6 12 18 5 26 5. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. However you can only use this pitch with built up roofing or specialized synthetic. What is the minimum pitch slope of an asphalt shingle roof.

What is the smallest pitch of a roof. 25 12 to 3 12 roof pitches. You could also opt for a pvc flat roofing membrane. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. The minimum requirement is 2 12. That works out to about nine degrees if that works better for you.