I am remodeling a first floor bathroom and the concrete for my shower drops down 3 inches from floor level. What kind of prep do I need before tiling the shower?
A contractor said all I need was sand mix to make the bed and didn't need a liner. I was thinking of applying RedGuard to the walls and floor. If I RegGuard on top the sand mix bed can I tile directly over that or do I need another layer of sand mix?