How Much Pitch Should A Metal Roof Have

In roofing it is expressed in inches of vertical rise over inches of horizontal run.

How much pitch should a metal roof have.

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. It was fashionable for modern style homes built in the 1960s to have little pitch just a barely negligible slope to help drain water. Different manufactures have different ratings for the pbr design but most are around 1 in 12.

It is a commercial rated roofing panel and works well for lean to shed roofs. Think of a classic addams family haunted house with its soaring peaks and you have a. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch the most obvious of which is the roof s ability to shed or withstand heavy snow rain or wind.

Visually this roof appears flat. The overall design of the roof matters and pitch is only one of its elements. Just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof. 3 12 1 2 12 and 1 4 12.

Roofs on victorian era houses were often sharply angled with a steep pitch. Standing seam metal roofs with mechanical lock systems to ward off leaks can be successfully and attractively installed on roofs with at least a slope of 1 in 12. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally. Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span.

A roof that slopes 12 inches for every 12 inches would have a 45 degree angle. Since most building codes require a pitch of at least one quarter inch per 12 inches you should anticipate that the angle of your roof will be at least 4 degrees. This pitch might be as low as 1 12. Low slope roofs however aren t necessarily a structural liability.

If the pitch of your roof is 6 inches per 2 inches the angle would be 26 5 degrees. The most common slopes are. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. One of the best metal roof profiles that is designed for use on low slope roofs is the pbr profile.

High slope roofs with many valleys can be vulnerable to water leakage into their many seams.