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Discussion Starter #1 (Edited)
I have a garage 16' X 20': the floor is unpainted (but was used for mechanical repair and is somewhat dirty) and has a couple of major cracks. The floor is about one inch below my paved driveway and in winter becomes worse... below snow level. Warm weather winter left a 3 to 4 inch slab of ice over the floor resulted from melting. I'm thinking of pouring a 4 inch slab over the existing floor. Is this a good idea, will it stick or just make more problems? Also, the current cement blocks and floor seem to soak up moisture like a sponge. Any suggestions?
 

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My experience with concrete is if you pour a new slab directly over an old, the new slab will crack in exactly the same place as the old one. The best option is to bust up the old one and either remove it completely or bust it small enough that it can be left as the fill/drainage layer below the new concrete.
 

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I agree with Joed. In addition,
Warm weather winter left a 3 to 4 inch slab of ice over the floor resulted from melting.
If you have ice forming at the garage entrance, then placing 4 inches if concrete over the existing will only cause you problems. I can foresee the water seeping between the two concrete slabs and then freezing causing the slabs to separate.

So, bottom line for me is what Joed said.

Good luck and be safe.
 
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