digest
Short Summary
Main recommendation: Fix squeaky floors by adding flooring screws next to the existing nails in the subfloor before installing any new flooring, since the squeak comes from the subfloor rubbing against loose nails as the floor deflects under weight. The video frames this as a fix for older houses built with dimensional lumber, where the subfloor often needs attention before new floating floors or hardwood go down.
Key Points
- Squeaks in pre-1990 floors are typically caused by nails that loosen over time, letting the subfloor rub against them when the joists deflect under foot traffic.
- Older construction used rough-sawn dimensional lumber and nailed subfloor, while pneumatic nailers in later decades often missed the joists, reducing load transfer.
- The speaker says a nail pounded back in will not stay put, because deflection repeatedly lifts it out.
- Dimensional lumber bows and curves over time, so the subfloor shifts underfoot, which is a root cause that re-nailing alone does not solve.
- Modern engineered trusses stay flat, which is why newer homes can take wide planks and large tiles while older homes generally cannot without subfloor work.
Details Worth Noting
Concrete instructions:
-
Buy a box of flooring screws.
-
Locate each nail in the subfloor. Nails are spaced every 8 inches along the floor joists; you can tell which way the joists run because the 8-inch-spaced nail lines run one direction and the 16-inch-spaced lines run the other.
-
Drive a flooring screw beside each existing nail, or pull the old nails out, since the speaker calls them useless.
-
The speaker says doing this at every nail location eliminates the squeaks, without opening the floor or rebuilding the subfloor.
-
The speaker says this approach is for cases where you are only addressing squeaks, not rebuilding the full subfloor package.
-
Before installing new flooring, the subfloor needs to be fixed, since the speaker says that is the first step.
-
The video's larger project covers opening the subfloor, drilling holes, running plumbing, repairing the subfloor, and bringing it up to standard for modern materials. Those are separate videos.
-
Floating floors (vinyl, engineered hardwood, laminate) are mentioned as a common project where the squeak problem still applies.
-
The speaker notes that older narrow hardwood (about 2.25 inches wide) followed imperfections, while modern planks of 12 to 16 inches need flatter subfloors.
-
The speaker asks U.S. viewers to comment whether flooring screws are sold there under a different name, since he's unsure.
Bottom Line
Squeaks come from subfloor movement, and driving a screw alongside each old nail is a quick way to stop the rubbing, but older homes may still need deeper subfloor work before installing large modern flooring.
