Minimum Pitch For Flat Metal Roof

Corrugated metal roofing has the same minimum pitch.

Minimum pitch for flat metal roof.

Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. 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. That is a 14 degree angle. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch.

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. 9 46 built up roof asphalt. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. Even though manufacturers say 1 4 12 is acceptable. Minimum required roof slope for roofing materials. However you can only use this pitch with built up roofing or specialized synthetic roofing.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Low slope metal roofs require less material which reduces the overall load on the building s structure. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. That said if you want to have a metal roof that is worth its weight in value that doesn t come with a ton of problems the minimum pitch for metal roof applications should be kept at around at least a 3 1 2 12 three and a half on 12 or above.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Roofing material or system.