Minimum Pitch For Corrugated Metal Roof

Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees.

Minimum pitch for corrugated metal roof.

Minimum pitch for corrugated metal roof. The corrugated metal roof minimum slope is 5 degrees. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Because of the shallow height of the undulating ridges of the 5v and corrugated profiles and the use of exposed metal fasteners to screw the metal to the roof deck they are limited to a slope that will shed rain quickly.

That is why all roofing manufacturers recommend the 5 degree pitch as the minimum slope and they will not provide any guarantees if it is installed flatter than this. That is a 14 degree angle. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The minimum pitch for roll roofing is 2 12 or 2 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. Minimum pitch for corrugated metal roof 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. Even though manufacturers say 1 4 12 is acceptable.

That said if you want to have a metal roof that is worth its weight in value that doesn t come with a ton of problems the minimum pitch for metal roof applications should be kept at around at least a 3 1 2 12 three and a half on 12 or above. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Corrugated metal roofing has the same minimum pitch. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch.

The traditional metal roof types such as 5v crimp shown above and corrugated are rated by the manufacturers for use down to a 3 12 pitch three inches of vertical rise for every foot of horizontal run.