Minimum Roof Pitch For Asphalt Shingles

For low slopes as well as any other slope your local building department should be contacted.

Minimum roof pitch for asphalt shingles.

Asphalt felt paper that is tacked to the roof sheathing. If you re having asphalt shingles put on your roof you will have to have a minimum slope. 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.

Why is 2 12 the minimum. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. 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. Fortunately the requirements are quite accommodating.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Metal roof shingles require a minimum roof pitch of 3 12 or greater. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. For those who don t understand the roof pitch number here is a way to envision it. 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. Minimum slope for asphalt shingles.

A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. Asphalt shingles require a minimum roof pitch of 2 12 or greater. Considering the roof slope requirement is important. They won t be appropriate for all roofs.

There are plenty of other options however for flat and nearly. Asphalt shingles do require that you have a minimum pitch to your roof. What slope is considered low slope for shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america.

What precautions need to be taken to install shingles on low slopes. The requirements for an asphalt shingles roof are contained in the international building code. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Let us recap on the minimum roof pitch required for each type of roofing material.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Shingles of all types need to have a slope to function properly. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.