How Much Slope Does A Metal Roof Need

Low slope metal roofs require less material which reduces the overall load on the building s structure.

How much slope does a metal roof need.

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. 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. 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. 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.

The most common slopes are. Minimum metal roof slope depends on the roof profile building design climate and site location. I e 4 inches of rise per 12 inches one foot of run. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine.

Since it s just over a deck if it had at least that much i probably wouldn t comment. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. 3 12 1 2 12 and 1 4 12. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.