WHAT'S SOLID ALL ABOUT
Solid hardwood flooring is milled from a single 3/4" thick piece of hardwood.
It expands and contracts with changes in your home's relative humidity. Normally, installers compensate for this movement by leaving an expansion gap between the floor and the wall.
WHAT'S NOT SOLID
Engineered hardwood floor is an alternative to solid hardwood floor. It's core is made up of multiple layers of wood stacked in a cross-grain configuration which minimizes expanding and shrinking.
Engineered hardwood floor holds up to the challenges of climate fluctuation and sub-floor moisture, so it can be installed above, on, or below grade, providing an advantage over solid hardwood in applicable areas.