Minimum Fall For Corrugated Iron 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.

Minimum fall for corrugated iron roof.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Profiles with a higher ridge at the panel connections can be installed lower. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

Just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof. 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. 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. Also pitch is often expressed in a shorthand style using just the first number.

Pbr which is typically used for industrial metal buildings can be installed as low as half inch pitch for example. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Minimum pitch for corrugated metal roof.