Can You Put Prefinished Hardwoods On a Concrete Floor?

Location

• Whether you can install prefinished hardwoods on a concrete floor depends mostly on the condition of the concrete and its location. Wood floors absorb moisture, causing them to expand, warp and curl. They should never be installed in basements or on a concrete slab prone to moisture issues.

Installation Method

• Another factor to consider is the installation method recommended by the manufacturer. Wood floors that must be nailed down are not a good option over concrete floors. A few manufacturers offer prefinished wood floors that can be glued to a cement slab or subfloor with a wood floor adhesive. Check with the manufacturer before purchase, though, to avoid damage caused by improper installation, which may void your warranty.

Solutions

• The simplest solution for installing prefinished floors over concrete slabs is to build a wood subfloor. This type of subfloor provides a flat, smooth surface that can be nailed for simple installation. Lay a plastic or rubber vapor barrier over the concrete, followed by two 1/2-inch-thick layers of plywood. Top the plywood with felt fabric before nailing the wood floor into place. Keep in mind, though, that this type of installation is only appropriate for dry concrete slabs, not basements.

Alternatives

• Engineered wood floors are made from a layer of wood veneer fused to a composite wood layer. These floors do not expand and contract the way a solid hardwood floor does and can be used in basements or other situations where prefinished hardwood isn't appropriate. Engineered wood floors are durable and attractive. When installed properly, you likely won't be able to tell the difference between an engineered wood floor and a solid hardwood floor.