As I mentioned in another thread, a friend's concrete sectional garage is plagued with condensation on the undersaide of the corrugated metal roof. Before we go to the lengths of lining the ceiling, would it be worth sealing the floor? It does get wet with penetrating damp, which is presumably the source of the water vapour which collects on the cold metal.
What's the best product to use? There seems to be a variety of paving and concrete sealants, and then there's ordinary bitumous paint. Is there a particular recommendation for the job? And does the floor have to be bone dry before application?
Many thanks - and a happy new year all round.
Bert