How Much Slope Does A Metal Roof Require In Arizona

Standing seam metal roofs with mechanical lock systems to ward off leaks can be successfully and attractively installed on roofs with at least a slope of 1 in 12.

How much slope does a metal roof require in arizona. Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material. 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 means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope.

Corrugated metal roofing has the same minimum pitch. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. Mineral surfaced roll roofing minimum roof slope roof pitch r905 5 2. 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 a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles.