Roof flashings can be made from thin metal, rubber, and a few other materials. Some flashings are built into products such as a bathroom-vent roof cap or the standard plumbing vent-pipe flashing.

A: Most roof leaks happen in the same place as Geri’s. Based on my 40-plus years of clambering around on roofs, I’d estimate that well over 90 percent of roof leaks happen at flashings.

Quick video showcasing how we install a plumbing pipe roof boot flashing on a ribbed metal roof. Butyl Tape is a great metal roof boot sealant and Sashco Lexel Is your belt and suspenders.