Minimum Sheet Metal Roof Slope

Asphalt shingles continue to be the most widely installed roof covering option in north america.

Minimum sheet metal roof slope.

The required roof slope varies with application of materials and use. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. Minimum metal roof slope depends on the roof profile building design climate and site location. 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 slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope.

This recommendation con flicts with some manufacturers who list 1. Low slope metal roofs require less material which reduces the overall load on the building s structure. Typically large footprint single story. 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. The minimum roof slope for metal roof panels depend on 3 different scenarios. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

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 pitch for. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

Determine the minimum slope of the roof based on the roofing material. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. The minimum roof slope requirement for metal panels varies depending on panel connection conditions.