Floating floor is actually a method of installing a floor rather than a specific type of flooring. As it suggests a floating floor is a flooring system laid down over a layer of underlay, which isn’t adhered or nailed to the sub-floor as the weight of the floor will keep it down. The boards form a system that "floats" over the existing sub-floor.
A floating floor system, either solid, laminate or engineered, must be installed over a subfloor (ply, wood or concrete) which is dry, flat, even, and load-bearing.
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