Minimum Fall For Corrugated Iron Roof

Minimum pitch for corrugated metal roof.

Minimum fall for corrugated iron roof.

According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. 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. 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 pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. 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. Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees. Also pitch is often expressed in a shorthand style using just the first number.

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