Question: is subfloor hardwood or softwood?
Answer: The Softwoods Used for Flooring Pine – Pine is the most popular wood used to make subflooring in the form of plywood. Pine subflooring is used under a carpet and under solid hardwood floors that are ¾ inches thick. Spruce and Fir – Both of these woods, like pine, are used to make plywood that is used for subflooring.