Minimum Slope 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.

Minimum slope corrugated metal roof.

It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. 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. 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 corrugated metal roof minimum slope is 5 degrees.

Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. Minimum metal roof slope depends on the roof profile building design climate and site location. 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. Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions.

Corrugated metal roofing has the same minimum pitch. Low slope metal roofs require less material which reduces the overall load on the building s structure. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. 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.