How to Fix a Squeaky Floor
Floor squeaks are caused by wood rubbing against wood — typically the subfloor rubbing on a joist, or a hardwood board rubbing against its neighbor. Most squeaks can be fixed in under 30 minutes. The best approach depends on whether you have access from below (basement or crawl space) or need to fix from above.
Likely Causes
- 1Subfloor not fully nailed to joists — movement causes rubbing
- 2Hardwood flooring boards rubbing at the tongue-and-groove joint
- 3Joist not level — subfloor flexes up and down
- 4Bridging or blocking between joists has loosened
- 5Seasonal wood movement from humidity changes
Purely cosmetic and structural nuisance. Not a safety issue unless the squeak is caused by significant structural movement.
How to Fix It: Step by Step
- 1Locate the squeak precisely
Walk slowly and have someone mark the squeak location with tape. You need to find which board or which joist gap is the source.
- 2Try the from-above fix first (hardwood)
Inject powdered graphite or talcum powder into the seam between boards at the squeak location. Work it in by placing a cloth over it and stepping on it repeatedly.
- 3Drive trim screws from above (carpet or to be covered)
Use Squeeeeek No More screws or 1.5-inch trim screws. Drive through the subfloor into the joist at a slight angle. Countersink and fill over with wood filler.
- 4Fix from below if accessible
From the basement or crawl space, have someone walk above while you locate the movement. Drive wood screws up through the subfloor at a slight angle — do not go all the way through the finished floor.
- 5Add blocking for joist gaps
If a joist is not contacting the subfloor, apply construction adhesive to a small wood shim and tap it into the gap. Don't force it — you'll raise the floor.
Materials & Tools Needed
Warning Signs It's Getting Worse
- ⚠Floor feels springy or bounces underfoot
- ⚠Multiple squeaks spreading across a room
- ⚠Visible gap between the floor and baseboard
- ⚠Cracking or popping sounds (not just squeaking)
When to Call a Professional
Call a flooring contractor or structural engineer if the floor deflects significantly underfoot (more than 1/4 inch), if the squeak is accompanied by cracking sounds, or if the floor feels spongy (possible structural damage or rot).
Not sure where to start?
Describe your problem and get a personalized repair plan — likely causes, repair steps, materials, and cost estimates.
Get My Repair Plan