Minimum Pitch For Shingle 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 shingle roof.

Minimum pitch for metal roof. These shingles are appropriate for pitches as low as 4 12 pitch all the way up to a 12 12. What is the minimum pitch slope of an asphalt shingle roof. 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. Traditional 3 tab shingles made with asphalt composite are the most popular type of shingle and are the most flexible in terms of adapting to many roof pitches. However you can only use this pitch with built up roofing or specialized synthetic roofing. Shingles of all types need to have a slope to function properly.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Asphalt shingles minimum roof slope roof pitch r905 2 2. The standard of lower pitch actually ranges between 1 12 to 5 12. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The metal roof minimum slope doesn t stray far from other building with different material. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. That works out to about nine degrees if that works better for you.

With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum roof slope for metal roofs is dependent upon the roof profile. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.