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I have this stuff covering the floor http://dynotile.co.uk/ They lock neatly together water just sits on top and eventually evaporates and I certainly have no issue sweeping the debris up.
i tiled my floor 2 years ago with cheap b+q floor tiles using swimming pool cement and grout (flexible) no problems with cracking and the car lives in there .just make sure you put them on a full bed with no air pockets