Minimum Pitch For Metal Porch Roof

In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch.

Minimum pitch for metal porch 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. Match the roofing material on the covered porch with that of the main roof. 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.

Your choice of material will impact what pitch your roof can have. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

A tar roof would work but it would be heavy smell like a bp oil spill. Match roof material and use appropriate 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.

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 metal roof shingles and lapped non soldered panels is 3 12. The smallest pitch of a standing seam metal roof is 1 4. 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 with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope. I decided on corrugated metal roofing because it s resistant to high winds is light weight and is structurally sound. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Corrugated metal roofing has the same minimum pitch.

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. Just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof.