Minimum Sheet Metal Roof Slope

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 sheet metal roof slope.

Determine the minimum slope of the roof based on the roofing material. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. This recommendation con flicts with some manufacturers who list 1.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

The minimum pitch for. 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. The minimum roof slope for metal roof panels depend on 3 different scenarios. 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.

The nrca roofing and waterproofing manual fifth edition states the mini mum slope for structural metal panel roof systems should be 1 2 in 12 2 4 degrees. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. The minimum roof slope requirement for metal panels varies depending on panel connection conditions. Minimum metal roof slope depends on the roof profile building design climate and site location.

With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Asphalt shingles continue to be the most widely installed roof covering option in north america. Typically large footprint single story. Low slope metal roofs require less material which reduces the overall load on the building s structure.

The minimum roof slope for metal roofs is dependent upon the roof profile. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.