Minimum Pitch For Corrugated Steel Roof

Panels joined with an applied lap sealant can go as low as 12.

Minimum pitch for corrugated steel roof.

The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally.

The pitch of a roof is expressed in a ratio of rise over run creating a theoretical triangle with these numbers to illustrate the amount of slope. Corrugated metal roofing has the same minimum pitch. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The minimum pitch allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio.

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. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch. 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. The standard of lower pitch actually ranges between 1 12 to 5 12. That is a 14 degree angle.

The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. Anything above that will require you to put out higher cost because they are already considered as higher pitch.