"Uno Hoo!" wrote in message
...
Chris Bacon wrote:
someone here wrote:

Roofing felt/bitumen should last ten years.


Only 10? If it's done properly, it ought to last for
*at least* 20 years, possibly 30.

Yes I agree. The felt roof that I am about to replace has been on since
I bought the house in 1986. It never had stones on - but rather a
'silver' coloured rubberised coating - any idea what that may be?

Solar Reflective paint.

http://www.interexint.co.uk/waterp4.htm

prevents the degradation by UV radiation of the bitumen and felt.

Dave