Why are my hardwood floors squeaking?

Squeaky hardwood floors are typically caused by loose subflooring, gaps between floor layers, or wood movement due to moisture changes - all common issues in Ottawa homes, especially during our dramatic seasonal humidity swings.

The most frequent culprit is loose subflooring that's separated from the floor joists underneath. When you walk across the floor, the subfloor flexes and rubs against the nails or screws, creating that annoying squeak. This often happens in older Ottawa homes where the original nails have worked loose over decades of expansion and contraction cycles. Seasonal moisture changes are particularly problematic here - our dry winters cause wood to shrink, while humid summers make it expand, gradually loosening the connection points.

Another common cause is gaps between the hardwood and subflooring. If there wasn't proper adhesive used during installation, or if the subfloor wasn't perfectly level, you'll get movement between these layers. The hardwood planks themselves can also develop squeaks if they're rubbing against each other due to insufficient expansion gaps around the room's perimeter. In Ottawa's climate, this is especially noticeable during heating season when indoor humidity drops significantly.

Moisture-related movement is a year-round concern in our region. Basements that aren't properly moisture-controlled can cause subflooring to warp or swell, creating uneven surfaces that lead to squeaks. Similarly, if your home's humidity levels swing dramatically (common with older HVAC systems), the constant expansion and contraction weakens all the connection points in your floor system.

Professional assessment versus DIY fixes depends on the severity and location. If squeaks are isolated to a few spots and you have basement access below, you might be able to add screws from underneath to re-secure the subflooring to joists. However, widespread squeaking usually indicates a more systematic problem requiring professional evaluation. For squeaks in upper floors with no access from below, repair typically requires working from above, which can be tricky without damaging the hardwood.

Next steps: Try to identify the pattern - are squeaks worse in winter or summer? Are they concentrated in high-traffic areas or spread throughout? If the problem is extensive or getting worse, it's worth having a flooring professional assess whether the issue is subflooring, moisture, or structural. For comprehensive floor repairs as part of a larger renovation project, contact Justyn Rook Contracting for a free consultation to evaluate your specific situation.