How Much Slope Do You Need For A Metal Roof

Common roof pitches and equivalent grade degree and radian angles.

How much slope do you need for a metal roof.

Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Learn more about finding the angle of a line using our slope calculator. You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler.

3 12 1 2 12 and 1 4 12. The result is the total square footage in your roofing project. For example if the vertical height was 6 inches your slope would be 6 12 or 6 12 or 0 5 expressed as a decimal. You need to consider the slope requirements of each panel to determine this minimum 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. 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. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine. Minimum slope for metal roof realistically any more than 1 4 per foot would okay at all but the most windy times.

That is a 14 degree angle. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Most manufacturer and industry recommendations require or at the very least recommend special underlayment or other considerations on roofs between 2 12 and 4 12. Since it s just over a deck if it had at least that much i probably wouldn t comment. Divide the results by the number of 12 inch segments in your level. The minimum slope of a roof depends on the roof s profile.

The profile is the shape taken by the sheets when you bend them to form panels. The most common slopes are. Slope is calculated as rise over run. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12.

Most roof s have a pitch in the 4 12 to 9 12 range. As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations.