Minimum Pitch For Metal Porch Roof

Your choice of material will impact what pitch your roof can have.

Minimum pitch for metal porch roof.

Minimum pitch for metal roof for the most part the minimum pitch for metal roof installations depends on what kind of material you are installing and the method in which the material is being fastened. Low slope metal roofs require less material which reduces the overall load on the building s structure. 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. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

I decided on corrugated metal roofing because it s resistant to high winds is light weight and is structurally sound. Match roof material and use appropriate slope. 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 minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Using corrugated metal also allows me to reduce the degree of slope or roof pitch needed to a mere 10 percent or a 1 to 10 pitch. The smallest pitch possible for shingles is 1 6 which is equal to 4 inches rise to 24 inches run. Minimum metal roof slope depends on the roof profile building design climate and site location. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

Corrugated metal roofing has the same minimum pitch. Match the roofing material on the covered porch with that of the main 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. The smallest pitch of a standing seam metal roof is 1 4.

The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12. A tar roof would work but it would be heavy smell like a bp oil spill. 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. Typically large footprint single story.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch.