On the cast garage slab (with underfloor heating), there are three rows of leca blocks forming a wall along the exteriors. On the leca blocks, prefabricated wall panels are then placed. Against the exterior of the first row of leca blocks, I plan to backfill with gravel or similar. The garage has proper drainage. The inside of the leca wall isn't particularly pleasant to look at, so I'm considering tiling directly on the inside of the wall, does that work? Or is there something to consider in terms of moisture etc.