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.

Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. 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. Corrugated metal roofing has the same minimum pitch.

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. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. 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 metal roof slope depends on the roof profile building design climate and site location.

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. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. The corrugated metal roof minimum slope is 5 degrees.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this.