How Much Pitch Does A Metal Roof Need

A pvc roof is a lot more durable and longer lasting that a conventional epdm rubber roofing system.

How much pitch does a metal roof need.

Most roof s have a pitch in the 4 12 to 9 12 range. 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 slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. 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 pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Next find the square footage of the metal roofing panels you want to use. Measure the length and width in feet then multiply together to find the square footage. Multiply the footprint square footage by the multiplier for your roof pitch to find the actual square footage of the roof.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. You could also opt for a pvc flat roofing membrane. The table below shows common roof pitches and the equivalent grade degrees and radians for each. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.