An underlayment is what lies in between the final floor and subfloor layers. It is a layer used for better adherence and flattening.
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What is the best underlayment when replacing a floor and why?
Plywood, fiberboard, or cement board is the best underlayment for floors, depending on the type of floor being installed. An underlayment provides more stability and a smoother surface to the finish floor.
if is a concrete slab floor and it has linoleum on it then clean the lino let it dry and use that as your water barrier/underlayment. if it a raised foundation then use wonderboard!
Wonder board is a cement board that is very firm. Unlike wood it doesn't warp or rot. It is especially used as the underlayment for tile floors and shower walls.
It is not recommended as it contains salts and debris that will cause concrete failure.