Don't really want to go to the extent of replacing the whole roof as asbestos sheets are intact and undamaged. However when its cold and wet roof suffers badly from condensation on the inside.
Tried Search facility but could see nothing.
I've tried bitumen paint on the screws/rubber grommets but the real problem is the sheets not the holes! Anybody any suggestions? Would a coat of bitumen all over the outside surface help?
Many thanks in anticipation
When warm wet air meets your cold car, green house, garage, whatever, the water vapour in the air turns from an invisible gas into condensation, dew, frost.
The only ways to stop the water vapour entering your garage is to seal all the openings.
You need to fill all the gaps, cracks, holes with foam or other fillers.