How to Install Hardwood Floor Over Concrete

Can You Install Hardwood Over Concrete?

Yes - but with important caveats. Concrete is porous and constantly releases moisture vapor, which is hardwood's biggest enemy. Solid hardwood should never be installed directly on or below grade concrete. Engineered hardwood is the better choice for concrete subfloors due to its superior moisture resistance. If you must use solid hardwood over concrete, a plywood subfloor system is required.

Step 1: Test Concrete Moisture - This Is Critical

Before anything else, test the concrete for moisture vapor emission. Use a Digital Moisture Meter for a quick surface reading, but also perform a plastic sheet test: tape a 2x2 ft piece of plastic sheeting to the concrete and seal all edges. After 24-72 hours, check for condensation under the plastic. Any visible moisture means the concrete needs treatment before hardwood installation.

Step 2: Prepare the Concrete Subfloor

Clean the concrete thoroughly - remove all dust, grease, paint, and adhesive residue
Check for flatness - concrete must be flat within 3/16" over 10 feet. Grind down high spots and fill low spots with self-leveling compound
Allow any patching compound to cure fully before proceeding
Check that the concrete is fully cured (new concrete needs at least 60 days)

Step 3: Install Moisture Barrier

This step is non-negotiable. Roll out ROBERTS 6mil Polyethylene Moisture Barrier across the entire concrete surface. Overlap seams by at least 6 inches and tape all seams with moisture barrier tape. Run the barrier 2-3 inches up the walls and trim after baseboards are installed.

Method A: Floating Engineered Hardwood (Easiest)

Install engineered hardwood as a floating floor directly over the moisture barrier. Use floor spacers to maintain expansion gaps at all walls. Click boards together using the WORKPRO installation kit tapping block and pull bar.

Method B: Glue-Down Engineered Hardwood

Apply construction adhesive over the moisture barrier and press engineered hardwood boards firmly into the adhesive. This method provides the most stable installation and is preferred for radiant heat systems.

Method C: Plywood Subfloor + Solid Hardwood

For solid hardwood over concrete: glue and mechanically fasten 3/4" plywood panels over the moisture barrier, then install solid hardwood over the plywood using the pneumatic flooring nailer. This adds height to the floor, so account for transitions at doorways.

Finishing

Install transition strips at all doorways. Install baseboards to cover expansion gaps.

Products Used in This Guide

General Tools MMD4E Digital Moisture Meter - test concrete moisture
ROBERTS Moisture Barrier 6mil 300sqft - essential vapor barrier over concrete
WORKPRO Flooring Installation Kit - tapping block, pull bar, mallet, spacers
WORKPRO 40-Pack Floor Spacers - maintain expansion gaps
Max Strength Clear Construction Adhesive - glue-down method
3PLUS 4-in-1 Pneumatic Flooring Nailer - nail-down over plywood subfloor
Maxiroc Transition Strip - doorway transitions

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