Minimum Pitch For Shingle Roof

Asphalt shingles minimum roof slope roof pitch r905 2 2.

Minimum pitch for shingle roof.

The standard of lower pitch actually ranges between 1 12 to 5 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Asphalt shingles can only be installed on roof slopes of 2 12 or greater. That works out to about nine degrees if that works better for you. What is the minimum pitch slope of an asphalt shingle roof. These shingles are appropriate for pitches as low as 4 12 pitch all the way up to a 12 12.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. The minimum requirement is 2 12. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

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. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. 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 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. Minimum pitch for metal roof. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.