How Much Slope Do You Need For A Metal Roof

As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations.

How much slope do you need for a metal roof.

Slope is calculated as rise over run. The most common slopes are. 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. Minimum slope for metal roof realistically any more than 1 4 per foot would okay at all but the most windy times.

Divide the results by the number of 12 inch segments in your level. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch. 3 12 1 2 12 and 1 4 12.

Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span. 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. The minimum slope of a roof depends on the roof s profile.

That is a 14 degree angle. The profile is the shape taken by the sheets when you bend them to form panels. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12.

The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine. 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. 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.

Express the slope of a metal roof by a ratio which indicates the pitch of the roof. Most roof s have a pitch in the 4 12 to 9 12 range. Learn more about finding the angle of a line using our slope calculator. Multiply the area by the slope.

You need to consider the slope requirements of each panel to determine this minimum slope. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.