what is locking hardwood
*Some engineered floors can be sanded and refinished. Check manufacturer's warranty. Locking Hardwood. A locking, or floating, floor is an engineered floor, but with the added advantage of a locking tongue-and-groove system.It's the perfect do-it-yourself flooring solution because nails, staples, and glue are not required.his is a 3/4-inch-thick solid piece of hardwood floor and is what you might typically think of for hardwood 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.