Before revision: Butynol roofing is a type of roofing material made from synthetic rubber, specifically butyl rubber.
After revision: Butynol Roofing alt=Photo of a small Butynol roof installation showing the seamless and smooth synthetic rubber membrane applied to a flat roof on a residential building in New Zealand|A small Butynol roof installation on a residential flat roof in New ZealandButynol roofing is a type of roofing material made from synthetic rubber, specifically butyl rubber.