Minimum Roof Pitch For Asphalt Shingles

But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope.

Minimum roof pitch for asphalt shingles.

If you re having asphalt shingles put on your roof you will have to have a minimum slope. For those who don t understand the roof pitch number here is a way to envision it. Asphalt shingles require a minimum roof pitch of 2 12 or greater. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. What precautions need to be taken to install shingles on low slopes.

That works out to about nine degrees if that works better for you. Asphalt shingles do require that you have a minimum pitch to your roof. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Fortunately the requirements are quite accommodating.

Asphalt shingles continue to be the most widely installed roof covering option in north america. For example if it is a very low slope water including snowmelt or. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

The requirements for an asphalt shingles roof are contained in the international building code. The minimum slope for an asphalt shingle roof is 2 12. Minimum slope for asphalt shingles. They won t be appropriate for all roofs.

Let us recap on the minimum roof pitch required for each type of roofing material. Considering the roof slope requirement is important. 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.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. What slope is considered low slope for shingles. There are plenty of other options however for flat and nearly. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12. For low slopes as well as any other slope your local building department should be contacted. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Asphalt felt paper that is tacked to the roof sheathing.