How to Fix a Squeaky Floor (From Above and Below)

Send a helper walking slowly back and forth across the squeaky area while you listen — first from above (to feel exactly which board moves) then from below if you have basement or crawlspace access. Mark each squeak with a piece of painter's tape on the floor above and a chalk line on the joist below. Most rooms have 2-4 distinct squeaks, not one continuous problem; identifying them individually lets you do precise fixes instead of guessing.

Below-access fixes are stronger, invisible, and free of patching. Choose this if you have a basement or crawlspace beneath the squeak. From-above fixes use the Squeeeek No More kit and work through carpet, hardwood, vinyl, or laminate — choose this when there's a finished ceiling below or a slab. Many homes use both approaches: from below in the basement areas, from above in the kitchen (since plumbing under the kitchen sink often blocks below-access).

Look closely along each joist beneath the marked squeak. Where the subfloor has separated, you'll see a hairline gap of light between the joist top and the subfloor underside. Run a bead of construction adhesive along both sides of a cedar shim, then tap the shim gently into the gap with a hammer — just until snug, not driven hard. Driving hard widens the gap and creates a new squeak above; the goal is to fill the existing void, not lift the subfloor.

For squeaks where there's no visible gap, the subfloor needs to be pulled tight to the joist. Pick a 1-1/4 or 1-5/8 inch drywall or deck screw that's at least 1/4 inch shorter than the combined subfloor + finish floor thickness (measure with a piece of wire if you don't know). Drill a 1/8-inch pilot hole up through the joist, then drive the screw while a helper stands on the squeak above — their weight closes the gap and the screw locks it shut. Space screws every 6 inches along the squeak area.

When the squeak runs 4+ feet along a single joist, individual screws every 6 inches is tedious. Cut a 2x4 the length of the squeak, run construction adhesive down its top edge, and press it tight against the underside of the joist so the 2x4's top face contacts the subfloor. Drive 2-1/2 inch deck screws every 8 inches at an angle through the 2x4 into the joist — and a few through the 2x4 up into the subfloor — to lock everything together. The cleat eliminates the entire run at once.

Use the kit's joist-finder drill bit to locate joists through the carpet — the bit has a metal tip that grabs solid wood and tells you when you've hit a joist (vs. just empty subfloor). Place the tripod fixture over the marked spot, slip a scored Squeeeek No More screw through the fixture, and drive it down through the carpet, padding, and subfloor into the joist. The screw is wax-coated so its threads slip through carpet fibers without snagging. When the screw head reaches the tripod, snap it sideways — the scored section breaks 1/5 inch below the carpet, invisible.

On hardwood, swap the carpet tripod for the kit's hardwood adapter (a flat metal piece that contacts the wood). The Squeeeek No More screw drives flush, then snaps off at 1/5 inch below the wood surface, leaving a clean hole about the size of a finish-nail dimple. Fill the hole with color-matched wood putty (Minwax or DAP), wipe the excess with your finger or a putty knife, and let it dry. On vinyl or laminate the hole is even smaller — usually no filler needed. And since you're already kneeling there with color-matched putty in hand, it's the perfect moment to erase any scratches in the hardwood while the lid is off.