How Much Slope Does A Metal Roof Need

I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine.

How much slope does a metal roof need.

3 12 1 2 12 and 1 4 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. Minimum slope for metal roof realistically any more than 1 4 per foot would okay at all but the most windy times. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

Metal should never be set up on a completely flat roof since they were not designed to handle pooling water which will lead to premature rusting and deterioration. Since it s just over a deck if it had at least that much i probably wouldn t comment. The most common slopes are. Standing seam metal roofs with mechanical lock systems to ward off leaks can be successfully and attractively installed on roofs with at least a slope of 1 in 12.

Minimum metal roof slope depends on the roof profile building design climate and site location. 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. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. I e 4 inches of rise per 12 inches one foot of run.