Minimum Metal Roof Pitch

According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following.

Minimum metal roof pitch.

Typically large footprint single story. The minimum roof slope for metal roofs is dependent upon the roof profile. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

After that the miimum pitch for metal panels depending on the methods used to join the panels. Roof pitch is the degree of building s roof slope. Low slope metal roofs require less material which reduces the overall load on the building s structure. It determines how many inches the roof should rise for every 12 inches expanding on the horizontal side.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. For low slope metal roofs under 12 that are nearly flat modified bitumen roofing thermoset and. Amongst many decisions one has to make when designing a metal building determining metal roof minimum slope is one of them. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Minimum roof pitch for metal building. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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 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. Panels joined with an applied lap sealant can go as low as 12. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Corrugated metal roofing has the same minimum pitch.