Min Roof Slope For Shingles

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

Min roof slope for shingles.

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

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. What is the minimum pitch slope of an asphalt shingle roof. 18 43 asphalt shingles with special underlayment requirements 2 in 12. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

9 46 built up roof asphalt. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Roofing material or system.

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. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

For those who don t understand the roof pitch number here is a way to envision it. 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. That works out to about nine degrees if that works better for you. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 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. Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. This number corresponds to the number of inches of rise in a 12 foot run. Match the roofing on the covered porch with the main roof. Asphalt shingles minimum roof slope roof pitch r905 2 2.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. Minimum required roof slope for roofing materials.