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 came to inspect. Told me that the roof had not been cleaned or properly prepared for the paint job in 2000, but they would investigate.
Have now sent me an e-mail telling me that it is not their responsibility - we must sort it out ourselves - paint it with a water-based acrylic.
I contacted a large paint manufacturer and they tell me that I cannot use acrylic on Onduline sheeting because the paint reacts with the bitumen. This explains the paint peeling off their paint job ...!! They obviously don't have a clue about their own product.

SO BE WARNED - ONDULINE ROOF SHEETING IS A LOUSY PRODUCT. We now probably have to replace our entire roof with a worthwhile product at HUGE EXPENSE after only 14 years. There are numerous other properties in our area with the same problems with their Onduline roofs.

BEWARE OF THIS TERRIBLE, TERRIBLE PRODUCT. (see photos)