Minimum Pitch For Flat Metal Roof

That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally.

Minimum pitch for flat metal roof.

Minimum required roof slope for roofing materials. Corrugated metal roofing has the same minimum pitch. Roofing material or system. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. In 12 0 25 in 12 1 19 built up roof coal tar 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.

Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. 9 46 built up roof asphalt. 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.

That is a 14 degree angle. 18 43 asphalt shingles with special underlayment requirements 2 in 12. 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. Even though manufacturers say 1 4 12 is acceptable.

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. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Minimum metal roof slope depends on the roof profile building design climate and site location.

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