Fix squeaky floors from underneath

Moments in this video

1. 0:00–1:23 Identify Squeak Source From How to Fix Squeaky Hardwood Stairs from Above, Step 1: Locate Squeak Source

   The first step is to identify the exact location of the floor squeak. This is done by having a helper walk over the suspected squeaky area on the floor above while you observe and feel for movement in the subfloor from underneath (e.g., in a basement or crawl space). The video explains that squeaks occur when the subfloor plywood moves up and down against loose nails in the joists. Look for visual cues like spiderwebs or dust moving, or place your fingers in the corner where the subfloor meets the joist to feel for slight vertical movement. If the subfloor is moving while the joist remains stationary, you've found the source of the squeak.

The guide that use this video

• How to Fix Squeaky Hardwood Stairs from Above