How Much Slope Does A Metal Roof Need

The most common slopes are.

How much slope does a metal roof need.

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. 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. 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. Since it s just over a deck if it had at least that much i probably wouldn t comment.

Low slope metal roofs require less material which reduces the overall load on the building s structure. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. Minimum metal roof slope depends on the roof profile building design climate and site location. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine. 3 12 1 2 12 and 1 4 12.