hardwood flooring buying guide - lowe's
3/4-inch solid. this is a 3/4-inch-thick solid piece of floor and is what you might typically think of for floors. because solid floors expand more when exposed to moisture than engineered floors you can only install them over a plywood subfloor at or above ground level. if you have a crawl space it's a good good to know. you can buy prefinished floors that are already stained and finished with a coating that is stronger than most site-applied finishes.