Floor squeaks are caused by gaps between the sub floor and the floor joists which have separated over time and can be fixed by simply reattaching that sub floor back to the framing.
How to fix a squeaky subfloor under carpet.
Locate squeak in floor and drive nail into joist.
The floor repair kit that solved our squeaky floor problem is called squeeeeek no more.
Fasten the subfloor to the floor.
1 use a hammer to locate a floor joist within the squeaky section of floor.
Use short screws to fasten subfloor and floor.
3 chuck the joist finding screw into the drill driver.
The squeak ender is a brand of joist support available at most home repair stores for a couple of bucks a metal brace that connects between the joist and the squeaky subfloor.
In this video this old house general contractor tom silva explains how to repair a squeaky floor through a carpet.
The trick however is to not damage your wall to wall carpet and to locate where the joists in your floor are located.
Peel back carpet and use screw to subfloor.
Use shims for smaller gaps in subfloor and joists.
Squeaks occur when subfloor separates from joists.
This isn t the same as having a floor squeak when you step on it which simply indicates that the subfloor isn t tightly fastened to the floor joist in one area.
How do you fix a squeaky subfloor.
2 tap the carpeted floor with the hammer and listen for dull thud indicating a joist below.
After seeing it on an episode of this old house i immediately went to my local hardware store and bought one.
To install one of these joist subfloor braces screw the mounting plate to the underside of the subfloor directly under the squeaking spot.
Slide the shim into the gap.
Go under the floor if you have access and have a friend walk around on the carpet while you listen for squeaks.
At around 20 this is without a doubt one of the best diy purchases i ve ever made right up there with my impact driver.