Traditionally, hardwood flooring came in thick planks of solid timber. Today, solid hardwood is still widely available, but many companies also offer engineered flooring—planks made with a thinner top layer of hardwood, bonded to other layers designed to prevent the floor from shifting during expansion and contraction cycles. “All wood moves in three directions: There’s tangential, radial, and longitudinal movement,” says Jones. “With engineered products, you’re creating opposing forces within the board to try to restrict the natural movement of the wood.”

For basements and apartments with concrete subfloors, engineered flooring offers an installation advantage. Whereas solid wood is generally installed over one or two layers of plywood, which can raise the height of a floor and interfere with existing doors or marginally reduce ceiling height, “engineered flooring can be glued directly to concrete, or over a soundproofing mat,” says Caroll. “It’s also suitable for installation over radiant heat.”

But choose carefully because some engineered floors have top layers so thin that they can’t be sanded and refinished in the future. Higher-quality products feature a thicker layer where “you’re getting as much usable wood as you would out of a solid board,” says Caroll, noting that with solid hardwood, “you can only use the part above the tongue and groove for refinishing.”