Minimum Roof Pitch For Asphalt Shingles

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12.

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. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. What slope is considered low slope for shingles. 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.

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. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. For low slopes as well as any other slope your local building department should be contacted.

If you re having asphalt shingles put on your roof you will have to have a minimum slope. They won t be appropriate for all roofs. Fortunately the requirements are quite accommodating. What is the minimum pitch slope of an asphalt shingle roof.

Asphalt shingles require a minimum roof pitch of 2 12 or greater. Let us recap on the minimum roof pitch required for each type of roofing material. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The minimum requirement is 2 12.

What precautions need to be taken to install shingles on low slopes. For example if it is a very low slope water including snowmelt or. The minimum slope for an asphalt shingle roof is 2 12. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

There are plenty of other options however for flat and nearly. Asphalt shingles continue to be the most widely installed roof covering option in north america. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction.

Why is 2 12 the minimum. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Minimum slope for asphalt shingles. Considering the roof slope requirement is important.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. For those who don t understand the roof pitch number here is a way to envision it. That works out to about nine degrees if that works better for you. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

The requirements for an asphalt shingles roof are contained in the international building code.