I have a garage which was attached to the side of my house as an afterthought 25 years ago (long before I moved in) and has the tarmac driveway for a floor - there is no damp proof membrane obviously so everything is getting damp and rusty in the winter.
The tarmac is solid and stable, so my question is can I lay concrete on top of the tarmac (with a damp proof membrane on top of the tarmac). I have asked locally and been told that I can and that I cannot. Obviously this leaves me a bit confused. It does seem a bit odd to dig up a perfectly sound base only to put hardcore back down.
A second part to this is would there be any problems with the edge of the concrete slab laying over where the footing for the house foundations would be?
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