Simon wrote:
My garage has corrugated asbestos-cement garage roof, which is cracked
beyond repair (I've emergency-sealed cracks and new ones now appear) so
I want to replace it. (I know my local tip will take it with advance
notice).

The company that built it will replace it for not a great deal of money
(about 250 quid I was quoted last year I think) but they will use
fibre-cement sheets.

These are good, as is corrugated iron (which is probably cheaper, too).


However I've seen that you can get bitumen type corrugated sheets from
B&Q/wickes etc for about 7 quid a pop.

This is called "Onduline" and is AFAIR made by Johnny Frog.


So the question is, which is the best material for a garage roof? I
kinda get the feeling that with fibre-cement it'll have the same
brittle characteristics and will degrade over not many years.

Well, about 40 or so...


Are the bitumen sheets any better/worse?

They sag. They sag, lots. They're better if you put them on
Sterling Board, but that adds to the cost.

You could DIY a pitched roof for a few hundred.