Yes, you can install hardwood over concrete in a Georgia home. The wood type and the condition of the slab decide whether it lasts. Engineered hardwood is the usual choice because it tolerates a slab far better than solid planks. Solid hardwood needs a wood subfloor built over the concrete first, and moisture testing comes before either one.
Why concrete is the hard part
Wood and concrete handle water differently. Concrete holds moisture and releases it slowly, even when the surface looks dry. Wood absorbs that moisture, swells, and moves. The result is cupped boards, open gaps, or a glue bond that lets go.
Georgia adds two problems. Heavy summer rain keeps the ground around a slab wet for days. Indoor humidity can also climb well above 50% when the air conditioning runs short. We cover the seasonal side in our post on how Atlanta humidity changes hardwood floors by season.
Slabs below grade are the most demanding. If your slab is in a basement, our basement flooring options post compares what holds up down there.
Which hardwood works on a slab
Not every method suits every slab. This table shows how the common options compare.
| Method | Best fit | Main concern |
|---|---|---|
| Glue-down engineered | A slab that tests dry and is flat | The adhesive must match the product and the moisture level |
| Floating engineered | Slabs with a moisture barrier underneath | Needs a perimeter gap, typically about 1/2 inch, and can feel hollow underfoot |
| Solid over a plywood subfloor | Homeowners who want true solid wood | Adds height, often an inch or more, which affects doors and transitions |
| Solid glued straight to the slab | We do not recommend it | Solid planks swell and shrink too much for a rigid bond |
Wider planks tend to show more seasonal movement. Plank width matters more on a slab, and our plank width guide explains the tradeoffs.
Check the slab in this order
This is the sequence we follow before recommending anything. Each step can stop the job or change the plan.
- Look for warning signs. White powder on the surface, stains, a musty smell, or past water events all call for a closer look.
- Check drainage outside. Soil that slopes toward the foundation, missing gutters, or downspouts that dump at the wall will keep sending water to the slab.
- Try a plastic sheet check. Tape a clear 2-foot square to the slab for 24 to 72 hours. Dark patches or droplets underneath are a warning. A clean result does not prove the slab is dry.
- Run real moisture tests. In-slab humidity probes or calcium chloride kits take a few days. Test several spots, especially along exterior walls and near plumbing.
- Check flatness. Lay a straightedge across the floor. Many products want the slab within about 3/16 inch over 10 feet. High spots get ground down and low spots get filled.
- Choose the system from the results. A dry slab can take glue-down or floating. A borderline slab needs a barrier. A wet slab needs the source fixed first.
A new slab is not automatically ready. A month is about the time a slab needs to reach structural strength, not flooring-ready dryness. Slabs commonly need about a month per inch of thickness, or longer, to dry enough for flooring. A 4-inch slab can take 3 to 4 months or more. Testing, not the calendar, decides readiness.
What goes wrong when steps get skipped
These are the failures we see most often on slab jobs.
- Board edges cup, often within weeks or months, when moisture keeps rising from below.
- Hollow-sounding spots show up where the adhesive never bonded or later released.
- A musty smell appears under a floating floor that went over a damp slab with no barrier.
- Gaps open in winter when indoor air gets dry, usually because humidity was never managed.
- Doors will not clear, because nobody measured the added height of a subfloor system.
Many of these trace back to skipped testing or planning, not bad wood.
When another floor is the better answer
Sometimes the slab says no. If readings stay high and the water source cannot be fixed, hardwood is the wrong floor for that room. Luxury vinyl plank is more tolerant of moisture, though slab moisture limits still apply, and it still gives you a wood look. If you are weighing wood against other materials, see why hardwood can beat laminate.
Homeowners in Alpharetta ask us about this often, usually for additions, converted garages, and finished lower levels. The answer is rarely a flat yes or no. It depends on what the slab tests like.
Ask any installer you interview whether they test the slab and how. Our post on what to look for in a good hardwood flooring contractor lists more questions worth asking. You can also read about our hardwood flooring installation work or our wider flooring installation services.
If you want your slab tested before you pick a floor, request a free estimate on our contact page or call 404-578-0926. We are licensed and insured and have worked across north Atlanta since 2008.
Keep reading
- Why You Should Choose Hardwood Flooring
- Why Should You Choose Wide-Plank Flooring for Your Home?
- What Type of Hardwood Flooring Should I Choose?