Minimum Slope Corrugated Metal Roof

Minimum metal roof slope depends on the roof profile building design climate and site location.

Minimum slope corrugated metal roof.

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. 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. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. Corrugated metal roofing has the same minimum pitch.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. 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. 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.

Low slope metal roofs require less material which reduces the overall load on the building s structure. 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. Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees.

Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions. The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope.