We're thinking about installing hardwood in the basement over concrete — is that even a good idea long term?

Solid hardwood in a basement over concrete is generally not recommended for the long term — but engineered hardwood can work well if the right precautions are taken.

Why solid hardwood struggles below grade

Concrete slabs, especially in Ottawa basements, are prone to moisture movement year-round. Solid hardwood is highly sensitive to humidity changes and will expand, cup, warp, or even develop mold if moisture levels aren't consistently controlled. Ottawa's climate — with cold, dry winters and humid summers — creates significant seasonal swings that make solid hardwood particularly vulnerable below grade. Most manufacturers will actually void the warranty on solid hardwood installed over concrete.

Engineered hardwood is a better fit

Engineered hardwood has a plywood core that's dimensionally more stable than solid wood, making it much better suited to the moisture conditions typical of a basement slab. It can be installed using a glue-down method directly to concrete, or as a floating floor over a quality underlayment with a vapour barrier. That said, it's not a "set it and forget it" solution — moisture testing of the concrete is essential before any installation begins. A relative humidity reading above 75% (or a moisture content reading above the manufacturer's threshold) means the slab needs to be addressed first.

Ottawa-specific considerations

Ottawa basements can be particularly challenging because of our freeze-thaw cycles and the age of many homes in areas like Centretown, Westboro, or Barrhaven — older slabs may have no vapour barrier underneath at all. A licensed contractor will test the slab with a calcium chloride test or an in-situ RH probe before committing to any wood product. If moisture levels are elevated, options include applying a moisture mitigation coating to the slab or reconsidering the flooring choice altogether.

Practical alternatives worth considering

If your basement sees any water intrusion history — even occasional dampness — luxury vinyl plank (LVP) is honestly the smarter long-term choice. It's 100% waterproof, looks remarkably like hardwood, and costs significantly less to install ($5–$10/sq ft installed vs. $8–$14 for engineered hardwood). Many Ottawa homeowners are choosing LVP for basements precisely because it removes the moisture risk entirely while still delivering a warm, wood-look finish.

If you're set on the look and feel of real wood, engineered hardwood over a properly prepared concrete slab can absolutely work — but it needs to be done right. For a free consultation on your basement project, reach out to Ottawa Floor Install and we can assess your slab conditions before recommending the best approach.