Minimum Pitch For Corrugated Metal Roofing

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.

Minimum pitch for corrugated metal roofing.

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 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. That is a 14 degree angle.

According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. It is the recommended slope as there is no guarantee if you opt for flatter pitch 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. 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 minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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 allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio. The most common evil performed by so called roofers is the use of corrugated roofing all the manufacturers nominate a 5 degree minimum pitch for this profile whenever and wherever a metal roof is called for.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. 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 for metal roofing varies depending on the profile of the metal. The corrugated metal roof minimum slope is 5 degrees.

Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.