Minimum Pitch For Corrugated Steel Roof

Corrugated metal roofing has the same minimum pitch.

Minimum pitch for corrugated steel roof.

The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12. In fact the larger the first number becomes the steeper the slope. 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 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. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The standard of lower pitch actually ranges between 1 12 to 5 12. That is a 14 degree angle.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. 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. 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 allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio. Panels joined with an applied lap sealant can go as low as 12. 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. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. After that the miimum pitch for metal panels depending on the methods used to join the panels.