Replace asbestos cement garage roof.

In message , Bash writes

Cement fibre?

Same as you have but not asbestos since 1995.

regards

exactly

Tends to collect condensation on the underside. There was a fairly recent discussion here.

If the purlins are strong enough to support asbestos you could do a OSB/PIR foam/steel sandwich.

regards

Modern materials aren't durable, are they? Onduline is about 15 years if looked after (kept cleanish and moss etc. removed - not much else that one can do), steel only a bit longer. The roof on my shed is asbestos cement, has had a lot of moss, is only about

I'm not impressed with Onduline (OK for sheds), but my big steel garage (vinyl coated steel) is 25 years old and still spotlessly perfect.

I've never had this problem - possibly because it's about 20' high, and even with a few people in there there's never enough moisture / volume ratio to cause trouble,.

That's worth knowing. I'm 64, so if it'll last 25 years...

For me appearance was also an important factor. I chose Steadman's AS 2000, not cheap but long lasting and still looking good 4 years on.

You probably /will/ have to get someone in to repair it.

In message , Geo writes

:-)

Care with installation is important, particularly on shallow pitched roofing. Rain can *bounce* under the sheet laps. Steadmans will recommend using a butyl strip seal and stitcher screws along the laps.

regards

... you only need to plan on replacing it once. (In 2008, government staticians reckoned that a 64 year old man in 2011 would have a life expectancy of 22.3 years - so the odds of not making 25 years is only slightly less than 50/50)

It's 3m long, same as the shed next to that was done with Corruline, so 2m sheets give a good overlap - about 90cm - and should be enough to stop water getting blown back up the slope.

Sorry. I was referring to the box section, rolled steel sheet side laps.

regards

Ah, thanks. Yes, that would be less pliable and so more likely to have big gaps and on a slack slope watere could easily be blown in.