Minimum Pitch For Corrugated Metal Roof

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.

Minimum pitch for corrugated metal roof.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch.

Even though manufacturers say 1 4 12 is acceptable. Corrugated metal roofing has the same minimum pitch. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. The corrugated metal roof minimum slope is 5 degrees.

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. Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees. That is a 14 degree angle. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

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. 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. 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. Corrugated roofing is an amazing choice for conventional pitched roof despite having the severe limitation about the pitch.

Minimum pitch for corrugated metal roof.