Min Roof Slope For Shingles

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

Min roof slope for shingles.

Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. 18 43 asphalt shingles with special underlayment requirements 2 in 12. That works out to about nine degrees if that works better for you. Determine the minimum slope of the roof based on the roofing material.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. 9 46 built up roof asphalt. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

Finding the right products for your low slope roof. What is the minimum pitch slope of an asphalt shingle roof. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.

Asphalt shingles minimum roof slope roof pitch r905 2 2. Minimum required roof slope for roofing materials. The minimum requirement is 2 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. This number corresponds to the number of inches of rise in a 12 foot run.

Roofing material or system. Match the roofing on the covered porch with the main roof. The minimum pitch for shingles is 1 6 which is equivalent to 4. Residential low slope roofing can generally be divided up into two broad categories.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Asphalt shingles continue to be the most widely installed roof covering option in north america. For those who don t understand the roof pitch number here is a way to envision it. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.