What is the recommended method for installing a hardwood floor over a concrete slab?

The recommended method for installing a hardwood floor over a concrete slab is to float the floor. This approach is particularly advantageous because it allows for the natural expansion and contraction of the wood without being restricted by the concrete beneath. A floating floor installation involves laying down a foam underlayment that helps with moisture absorption, sound reduction, and cushioning, while the planks are interconnected without direct attachment to the subfloor.

This method is especially suitable for concrete because concrete can retain moisture, which can affect the integrity of wood if it is glued or nailed directly to it. By floating the floor, the hardwood can effectively adapt to changes in humidity and temperature, reducing the risk of warping or buckling. This flexibility is key when working with more unstable substrates like concrete, making floating a reliable and practical choice for hardwood installation in this scenario.