Basement Subfloor. Provide a flat level surface for the finish flooring. The underside of a basement subfloor tile showing the raised ribs that provide an air space between the tile and the concrete floor.

That means you wind up with a drier basement. Basement subfloor panels are an all in one solution. Wooden subfloors work well as basement subflooring if the wood is properly treated.
The subfloor definition is professionally listed as the foundation for a floor in a building.
One company barricade offers a product that is 2 x 2 x 1 125 tiles with osb wood on top and closed cell polystyrene insulation and xps on the bottom. This allows all layers of your basement floor to last longer than ever. Wooden subfloors work well as basement subflooring if the wood is properly treated. A man installing a basement floor.