The Single Creaky Floorboard That Only Got Worse When I Ignored It

The Permanent Fix

Construction adhesive in a caulking tube. That’s what a finish carpenter told me to use.

Specifically, a heavy-duty polyurethane construction adhesive like Loctite PL Premium or Liquid Nails Heavy Duty. You squeeze a thick bead along the top of the joist where the subfloor sits, right into that gap, then screw the floorboard back down through the finish floor into the subfloor while the adhesive is still wet.

The adhesive fills the void completely, bonds the layers together, and cures rock-hard. No compression, no movement, no creak.

I used one $7 tube, applied it with a standard caulking gun, and drove three 2½-inch wood screws through pre-drilled countersunk holes to clamp everything tight while it set. I filled the screw holes with wood filler afterward and touched up the stain.

That was eighteen months ago. Dead silent ever since.

The one mistake? Over-tightening the screws before the adhesive spreads. You want firm contact, not so much pressure that you squeeze all the adhesive out sideways.

When to stop and call someone: If multiple boards creak in a pattern, if the floor feels spongy or noticeably uneven, or if you see cracks in the ceiling below, you might have a sagging joist or structural settling. That’s not a tube-of-glue problem.