Insulating Garage Roof

[iain67]

Just wondered if anyone else has had this problem, my garage roof is corrugated concrete sheeting or maybe even asbestos as it's quite old. The problem is it gets really drippy on the inside when it's cold due to condensation forming, it even ices up when it's that cold.

I am thinking of insulating it using Celotex/Kingspan trouble is this is quite expensive as i was thinking of using 75mm or 80mm, any other solutions would be great or would 50mm do the job?

Thanks

Iain