Maximum Roof Pitch

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Maximum roof pitch.

Roof slope equivalents as rise. The most commonly used roof pitches fall in a range between 4 12 and 9 12. Pitches above 9 12 are very highly angled and are designated steep slope roofs. Minimum and maximum roof slope limits vary based on specific roof system and project types.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Citation needed carpenters frame rafters on an angle to pitch a roof. There is no standard universal roof pitch.

Buffalo new york and montreal quebec canada specify 6 in 12 a pitch of approximately 26 6 degrees. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof. You could also opt for a pvc flat roofing membrane.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. In the usa the range of standard pitches is anywhere between 4 12 and 9 12. Roof pitch multiplier table. Degrees to pitch rise in run table.

Gable and other multi pitched roofs allow for lower primary structures with a corresponding reduction in framing and sheathing materials. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. In the uk the typical house has a pitch between 40 50 although 45 should be avoided. Roof pitch varies depending on culture climate style and available materials.

What is the maximum roof pitch for a roof tile. Following is a review of code requirements and nrca s roof slope guidelines as well as some additional factors designers should consider. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10.

Roof tiles and slates are very versatile products and can be used on a variety of roof pitches.