Harris Wood's solid wood floors live up to their name. They are precisely milled from a single piece of wood and cut 3/8" or 3/4" thick in random lengths up to 7'. Widths of 2-1/4" and 3-1/4" are available in a variety of species and pre-finished colors. Solid floors must be nailed-down on or above ground level over an OSB board or plywood subfloor.