Minimum Roof Pitch For Asphalt Shingles On Flat Roof

Roofing material or system.

Minimum roof pitch for asphalt shingles on flat roof.

What is the minimum slope requirement where shingles can be installed. Tuesday september 11 2018. Learn what the minimum slope for an asphalt shingle roof is the difference between sloped and flat roofs and how to calculate the slope of any roof. What is the minimum slope for an asphalt shingle roof the short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

What are gaf asphalt shingles. The best slope for a roof varies according to the type and purpose of the roof. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. Why is 2 12 the minimum.

3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood. Minimum required roof slope for roofing materials. 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 slope x in 12 minimum required slope degrees asphalt shingles.

This number corresponds to the number of inches of rise in a 12 foot run. At nelson contracting we proudly offer and install gaf asphalt shingles for both high and low pitch roofs. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Yes you are correct in saying that a pitch of 3 to 12 may not be sufficient for asphalt shingles as it s a water shedding system not a waterproof system.

The minimum slope for an asphalt shingle roof is 2 12. However if you decide to go with a single ply membrane such as pvc by ib roofs or a properly installed standing seam metal roof then a pitch of 3 will be plenty sufficient and you should have no issues with the roof. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing. Minimum slope for asphalt shingles.

2 1 2 12 minimum roof slope for clay and concrete tile. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Asphalt shingles continue to be the most widely installed roof covering option in north america.

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Gaf asphalt shingles combined with the proper underlayment make ideal low slope roof shingles that do an excellent job of preventing water build up and leaking. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. 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.