How Much Pitch Should A Metal Roof Have

It was fashionable for modern style homes built in the 1960s to have little pitch just a barely negligible slope to help drain water.

How much pitch should a metal roof have.

The overall design of the roof matters and pitch is only one of its elements. Different manufactures have different ratings for the pbr design but most are around 1 in 12. Sheet metal panels install quickly and easily and can be done without professional assistance especially on low slope roofs and come in a much wider range of colors than other nearly flat roofing options. 3 12 1 2 12 and 1 4 12.

If the pitch of your roof is 6 inches per 2 inches the angle would be 26 5 degrees. 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. 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. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. This pitch might be as low as 1 12. Roofs on victorian era houses were often sharply angled with a steep pitch. Low slope roofs however aren t necessarily a structural liability.

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. One of the best metal roof profiles that is designed for use on low slope roofs is the pbr profile. Visually this roof appears flat. With an efficient drainage system and sturdy support flat roofed homes won t be prone to leaks.

In roofing it is expressed in inches of vertical rise over inches of horizontal run. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. 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. It is a commercial rated roofing panel and works well for lean to shed roofs.

A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. A roof that slopes 12 inches for every 12 inches would have a 45 degree angle. High slope roofs with many valleys can be vulnerable to water leakage into their many seams. Just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof.

In most occasions a pitch of three in twelve is preferred but this should also take into consideration the manufacturer s recommendations as well the unique condition of the corrugated metal roof.