Installed Onduline green roof sheeting on our new house build 1995. The impregnated black bitumen that is in the sheets, started leeching through the green colour within a couple of years, causing big splotches of black throughout the roof. We complained to Onduline and they came to inspect and agreed that there was a fault in the product. They painted the roof at their cost in 2000. Within a couple of years the paint was peeling off in large strips across the roof. This got worse and worse over the years. I contacted them again and they... read full review »