Our garage
floor tiles have an interlocking joint that is extremely tight once locked together,
but we can’t claim that it’s 100% waterproof. If large amounts of water are
left to sit on the floor, it is possible that some will seep through the gaps
in between the tiles. The most
common concern people have is that the water will become stagnant and start to
smell but this will not happen. Firstly, the chemicals in PVC act as a natural
biocide that prevents the growth of nasty smelling bacteria and secondly any moisture under the tiles would evaporate back up through
the joints because the temperature above the tiles is almost certain to be
higher than that under the tiles.