The short answer
A hung-window sash may stop staying open when its balance system, cords, springs, shoes, pivots, or related hardware are worn, disconnected, broken, mismatched, or obstructed. Binding, an out-of-square frame, swelling, or prior modifications can also affect operation. Stop using a sash that can fall, identify the window and hardware, and compare compatible repair with sash or full-unit replacement.
Evidence for the service request
- Window manufacturer, product label, approximate age, and operation type.
- Whether one sash or both sashes are affected.
- Whether the sash drops freely, binds, tilts, rattles, or sits out of square.
- Visible broken cords, loose hardware, displaced shoes, damaged pivots, or debris in tracks.
- Frame swelling, cracked joints, water staining, or movement at the opening.
| Compare | Repair path | Replacement path |
|---|---|---|
| Parts | Are compatible balance and hardware components available? | Is the product obsolete, damaged, or unsuitable beyond the hardware? |
| Frame | Is the frame square, sound, and dry? | Does frame or opening damage require broader access? |
| Result | Will the repaired sash operate, lock, and stay supported? | What product, installation, trim, and finish work replaces the existing unit? |
Common questions
Common questions
Can a falling sash be solved by adding weatherstripping?
Weatherstripping is not a substitute for a working support or balance system. The operation hardware and alignment should be identified and serviced with compatible components.
Sources
Sources
- Window Types and Technologies — U.S. Department of Energy
- How to Avoid a Home Improvement Scam — Federal Trade Commission