The high-quality portion for face layers, lower quality for cores and backs. It is conceivable that a tree is felled in the woods on Monday and is plywood by Thursday. There are several variations on the theme. The usual is three layers, however, some manufacturers use five. Oak cores are common, but other species are acceptable.
Backs are normally oak but species of very similar characteristics are sometimes used.
The bottom line, however, is always the same. Laminated Blocks Installed Below Grade Ultimately, the customer has for their floor, a product that displays far less expansion and contraction with moisture changes and therefore can be successfully installed below grade, in basements, in humid climates, and even fit tight to vertical obstructions. Very different from solid floors. The floor can be glued direct to concrete with several adhesive types. The major concern of many who display resistance to the laminated products is longevity.