I have done lots of tiling on good sub-flooring, but for my next home project I am tiling over a concrete floor in my basement that abuts a stone foundation. The problem is there used to be walls with studs and lathing that we have removed and now have about a 4" gap between the concrete and the stone foundation. My gut is telling me not to tile over the empty space but how do I fill it? There is a 4" trench at the edge of an entire room... all 4 sides. Should I fill the trench with concrete or tile over this space with the idea that no one will ever walk along the wall?
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