How Much Slope Does A Metal Roof Need

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

How much slope does a metal roof need.

I e 4 inches of rise per 12 inches one foot of run. 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. 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. The most common slopes are.

3 12 1 2 12 and 1 4 12. Minimum metal roof slope depends on the roof profile building design climate and site location. Low slope metal roofs require less material which reduces the overall load on the building s structure. 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 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. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine. 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.