How Much Pitch Does A Metal Roof Need

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

How much pitch does a metal roof need. 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. 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. 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.

Most roof s have a pitch in the 4 12 to 9 12 range. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Use our roof pitch calculator to find the pitch of your roof. Multiply the footprint square footage by the multiplier for your roof pitch to find the actual square footage of the roof.

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. You could also opt for a pvc flat roofing membrane. A pvc roof is a lot more durable and longer lasting that a conventional epdm rubber roofing system. Next find the square footage of the metal roofing panels you want to use.