Minimum Pitch For Shingle Roof

Shingles of all types need to have a slope to function properly.

Minimum pitch for shingle roof.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The roofing materials most often used for these pitches include asphalt composite shingles. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. The standard of lower pitch actually ranges between 1 12 to 5 12. Asphalt shingles minimum roof slope roof pitch r905 2 2.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. 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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 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. The metal roof minimum slope doesn t stray far from other building with different material. That works out to about nine degrees if that works better for you.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The minimum roof slope for metal roofs is dependent upon the roof profile. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. However you can only use this pitch with built up roofing or specialized synthetic roofing.

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