Minimum Slope For Shingle Roof

Roof pitch defined and explained.

Minimum slope for shingle roof.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. Roof pitch designations are comprised of two numbers indicating a ratio. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

The standard of lower pitch actually ranges between 1 12 to 5 12. The minimum roof slope for metal roofs is dependent upon the roof profile. The metal roof minimum slope doesn t stray far from other building with different material. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Shingles of all types need to have a slope to function properly. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Pitch is the term used to describe the angle slope or slant of your roof. 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. The minimum requirement is 2 12.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Minimum pitch for metal roof. Asphalt shingles minimum roof slope roof pitch r905 2 2. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.

However you can only use this pitch with built up roofing or specialized synthetic roofing. That works out to about nine degrees if that works better for you. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.