Min Roof Slope For Shingles

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.

Min roof slope for shingles.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Asphalt shingles minimum roof slope roof pitch r905 2 2. Determine the minimum slope of the roof based on the roofing material. 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. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

Shingles of all types need to have a slope to function properly. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Residential low slope roofing can generally be divided up into two broad categories. What is the minimum pitch slope of an asphalt shingle roof.

9 46 built up roof asphalt. Asphalt shingles continue to be the most widely installed roof covering option in north america. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum requirement is 2 12. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Finding the right products for your low slope roof.

This number corresponds to the number of inches of rise in a 12 foot run. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Roofing material or system. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. The minimum pitch for shingles is 1 6 which is equivalent to 4.

Match the roofing on the covered porch with the main roof. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch.