Standard Roof Pitch Michigan

The most commonly used roof pitches fall in a range between 4 12 and 9 12.

Standard roof pitch michigan.

You could also opt for a pvc flat roofing membrane. Roof slope multipliers for roof components of sloping roofs multiply by the figures given below to obtain the cost per square foot of horizontal projection. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.

I e 4 inches of rise per 12 inches one foot of run. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs. Roof slopes are most commonly defined by the rise over run ratio.

These are utilized in residential applications. 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. The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Built up roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage except for coal tar built up roofs which shall have a design slope of a minimum one eighth unit vertical in 12 units horizontal 1 percent slope. Roof pitch degree table. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. Pitches above 9 12 are very highly angled and are designated steep slope roofs.

Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. 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. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.