What is wrong with lining my box gutters with rubber?
A. Lining your box gutter with rubber is a bad idea. The box gutter frame is built with slope to your outlet tube and when the frame rots away from water damage the slope is obstructed. When you line rubber over the rotten frame you end up with pooling water in your box gutter and water flowing right over the edges. The rubber is wrapped into the outlet tube and that narrows its drainage capacity. When this happens you in up with clogs and more overflow. The right way to fix your box gutter problem is to take out the old box gutter linings. Fix the rotten wood in the box gutter frame and make sure the slope is draining to your outlet tubes. Then it’s always better to line your box gutter in terne or copper.
