Wood floors are so popular! And all of the tiles that look like wood give you some great design options. Solid hardwood can not be installed directly over a concrete slab floor, a sub floor is needed and abutments to other flooring must be considered. However, a job finished floor (stain and sealer completed on site) has a beautiful finish. That being said, the most important consideration for an engineered floor (product is complete when installed) is the quality look of the finish and the thickness of the top layer (Should be at least ⅛” thick).