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.

Low slope metal roofs require less material which reduces the overall load on the building s structure. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Typically large footprint single story. The required roof slope varies with application of materials and use.

The minimum roof slope for metal roof panels depend on 3 different scenarios. 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. See the below florida building code fifth edition 2014 2017 sections below to determine which slope is appropriate based on your specific design scenario.

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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal 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 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. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels. 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 minimum roof slope requirement for metal panels varies depending on panel connection conditions. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Determine the minimum slope of the roof based on the roofing material.

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 minimum pitch for. This recommendation con flicts with some manufacturers who list 1.