12 Asphalt Shingle Roof Slope

Asphalt shingles minimum roof slope roof pitch r905 2 2.

12 asphalt shingle roof slope.

The 45 degree roofs seen on a frame houses are 12 in 12 but roofs can be even steeper consider the mansard roofs introduced by french second empire architects in the middle of the 1800s. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Roofing material or system.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.

Roof pitch area multipliers. Additional underlayment protection with special application methods are required when asphalt shingles are installed on a low slope roof following the manufacturer s application instructions. The pitch of the roof is the rise over a 12 inch run. Use our roof pitch calculator to find the pitch of your roof.

Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. 9 46 built up roof asphalt. Pitched roofs begin with with slopes greater than 3 in 12. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Mansard roofs with nearly vertical faces can boast a pitch of 20 in 12. High and low pitch examples two examples at each end of the spectrum. 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 shingle options a pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options.

Minimum required roof slope for roofing materials. This number corresponds to the number of inches of rise in a 12 foot run. 100 1 054 105 4ft 2. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. Asphalt shingles should never be applied to roof slopes below 2 12 2 of vertical rise for every 12 of horizontal run or 9 5.