Minimum Pitch For Corrugated Metal Roof

Corrugated metal roofing has the same minimum pitch.

Minimum pitch for corrugated metal roof. That is a 14 degree angle. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. 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.

Minimum pitch for corrugated metal roof. 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. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. 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.

That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. Corrugated roofing is an amazing choice for conventional pitched roof despite having the severe limitation about the pitch. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch.

Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees. 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. Even though manufacturers say 1 4 12 is acceptable. 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.