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Do you need a subfloor over concrete. They each have underlayment considerations that depend on the subfloor material and type of tile you are installing. Installing Wood Subfloors Over Concrete Hardwood Floors Magazine Ad Search Tile And Flooring Installation. Subfloor over concrete . You can install tile over concrete vinyl and even other tiles. Subfloors are strong versatile and very durable. A common tile installation method starts with a layer of thinset a mortar adhesive going over the subfloor. Then the backer board is put over the thinset and screwed into the wooden subfloor. While a subfloor is not necessary to add structural strength when youll be laying finish flooring on top of a concrete slab as in a basement remodel subflooring over concrete offers two other advantages. Subfloor panels offer much easier installation than the traditional technique of nailing down 2x4 sleepers over the concrete and covering them with plywood. Concrete slabs may look pe...