My subfloor squeaks badly under my carpet - what's the best fix before new flooring?

Squeaky subfloors need to be fixed before any new flooring installation - the squeaks will transfer through and potentially worsen with new flooring, especially hard surfaces like hardwood or laminate.

The squeaking is typically caused by loose subflooring moving against floor joists when you walk on it. The most effective fix is screwing the subfloor down to the joists using 2½" construction screws every 6-8 inches along each joist line. This creates a solid, squeak-free foundation that won't telegraph noise through your new flooring.

In Ottawa's older homes, subfloor issues are common due to settling and seasonal moisture changes. Your contractor will first locate the floor joists (usually 16" on center) and identify exactly where the subfloor has separated. Sometimes additional blocking between joists is needed for particularly loose areas. If the existing subfloor is severely damaged or uneven, adding a layer of ¾" plywood or OSB subflooring may be necessary.

This repair is crucial for any hard surface flooring like hardwood, laminate, or luxury vinyl plank, as these materials will amplify subfloor noises. Even with carpet, fixing squeaks now prevents future problems and ensures your new flooring performs properly. The work typically adds $2-4 per square foot to your project but prevents costly callbacks and ensures a professional result.

Before your flooring installation begins, have your contractor assess the entire subfloor for squeaks, loose boards, and level issues. This preparation work is essential for a successful flooring installation that will perform quietly for years to come.

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