Double-hung window slides back down
You raise the lower sash and it slowly sinks or drops fast, sometimes more on one side than the other.
Start here: Start with sash balance and pivot shoe checks. This is the most common failure pattern.
Window troubleshooting
Window Won’t Stay Open
Direct answer: If a window will not stay open, the usual cause is failed sash support hardware, not the glass or frame itself. On a double-hung window that means a bad window sash balance or disconnected pivot shoe. On a casement or awning window, it is usually worn window hinge friction hardware or an operator issue.
Most likely: Most often, the sash drops because one side is no longer carrying its share of the weight. You may notice the sash tilts, slides crooked, or falls the last few inches instead of holding where you leave it.
First identify what kind of window you have and how it fails. A double-hung window that slides down is a different repair than a crank-out window that swings back shut. Reality check: once sash support hardware wears out, cleaning alone usually will not make the window stay up. Common wrong move: replacing weatherstripping or caulking when the real failure is inside the jamb or hinge hardware.
Don’t start with: Do not start by forcing the sash higher, jamming sticks into the track, or spraying oily lubricant everywhere. That hides the real problem and can damage the track, balance, or finish.
Window slides down on its ownCheck for a failed window sash balance, disconnected pivot shoe, or a sash that is out of its track.
Window swings or drifts shutCheck the window hinge friction hardware and operator before blaming the whole window.
Last reviewed: 2026-04-05
What kind of window movement are you seeing?
Single-hung lower sash will not hold position
The moving sash opens but will not stay where you leave it, even though the upper sash is fixed.
Start here: Look for worn or broken window sash balance hardware in the side jambs and any track damage.
Casement window swings inward or outward after opening
You crank it open, stop turning, and the sash creeps back instead of holding its angle.
Start here: Check the window hinge friction hardware first, then the operator arm and mounting points.
Window binds, then drops when it breaks free
The sash feels sticky in spots, then suddenly slips or falls once it gets past the tight area.
Start here: Inspect the tracks for paint, dirt, bent liners, or a sash that is rubbing before assuming the support hardware is bad.
Most likely causes
1. Failed window sash balance
On double-hung and some single-hung windows, the balances are what counter the sash weight. When one weakens or breaks, the sash will not stay where you put it.
Quick check: Raise the sash a few inches and let go carefully. If it drops, tilts, or one side hangs lower, suspect the balances first.
2. Disconnected or damaged window pivot shoe
Tilt-in vinyl windows use pivot bars and shoes in the side tracks. If a shoe cracks or loses engagement, the sash can sit crooked and slide down.
Quick check: Tilt the sash in and look at the bottom corners and side tracks. If one corner is not seated right or one shoe sits lower than the other, this branch fits.
3. Binding track, paint buildup, or bent jamb liner
A sash that drags hard can fool you into thinking it has support, then it slips once the friction breaks loose. Older painted windows do this a lot.
Quick check: Run the sash slowly through the full travel. Look for scrape marks, fresh rub spots, peeling paint, or a liner pulled loose from the jamb.
4. Worn window hinge friction hardware or operator on a crank-out window
Casement and awning windows rely on hinge friction and operator arms to hold position. When those wear, the sash drifts closed even though the crank still moves it.
Quick check: Open the sash partway and watch the arms. If the sash moves back without the crank turning, the hinge friction is usually the problem.
Step-by-step fix
Step 1: Identify the window type and the exact failure pattern
You can waste a lot of time chasing the wrong hardware if you do not separate a sliding sash problem from a crank-out hinge problem right away.
- Look at how the window opens: straight up and down, or outward on hinges with a crank.
- Open it only a few inches at first and support it with one hand.
- Notice whether it drops evenly, falls more on one side, binds before moving, or slowly drifts shut.
- Check whether the lock is fully unlocked and whether any tilt latches are partly engaged.
Next move: You now know which hardware family to inspect next instead of guessing. If you cannot safely hold the sash, stop and secure the area so the window does not slam shut on fingers or crack the sash.
What to conclude: A straight sliding sash points you toward balances, pivot shoes, and tracks. A crank-out sash points you toward hinge friction hardware and the operator arms.
Stop if:
- The sash feels loose enough to fall out of the frame.
- The glass is cracked or the sash frame is separating at a corner.
- You cannot identify how the sash is retained in the opening.
Step 2: Check for simple track and sash binding before blaming hardware
Dirt, paint, and bent liners are common and easy to spot. They can make a window act unpredictable, especially on older wood or vinyl units.
- Inspect both side tracks or jamb liners for packed dirt, insect debris, paint drips, or a liner pulled away from the frame.
- Look for scrape marks on the sash edges that show where it is rubbing.
- Clean loose dirt with a dry cloth or vacuum brush. If needed, wipe the track with a damp cloth and mild soap, then dry it.
- For painted wood windows, look for paint bridging between sash and stop or thick paint ridges in the channel.
- Open and close the sash again slowly to see whether the sticking point changed.
Next move: If the sash now moves smoothly and holds better, the main issue was binding or drag, not a failed support part. If the sash still drops or drifts after the track is clean and clear, move on to the support hardware checks.
What to conclude: A window that still will not hold after the easy friction issues are removed usually has worn support hardware, not just a dirty track.
Step 3: Inspect sash support hardware on sliding windows
This is the main diagnostic step for a double-hung or single-hung window that slides down. Most of the time, one side has failed or come loose.
- Raise the sash a few inches and compare the gap on the left and right sides. A crooked sash usually means one side is no longer supported correctly.
- If the window is a tilt-in style, tilt the sash in and inspect the bottom corner pivot bars and the shoes in each side track.
- Look for one shoe sitting lower than the other, a cracked shoe body, or a pivot bar that is not engaged.
- On non-tilt styles, inspect the side jamb area for a loose, broken, or obviously weak window sash balance.
- If one side has visible damage and the other side looks intact, plan on replacing the failed side and strongly consider replacing the pair so the sash stays level.
Next move: If you found a broken balance or damaged pivot shoe, you have a solid repair direction and can match the part before disassembly. If nothing is visibly broken but the sash still drops, the balances may be weak internally or the sash may be heavier than the hardware can handle because of glass or frame issues.
Step 4: Inspect hinge friction and operator hardware on casement or awning windows
Crank-out windows do not use sash balances like sliding windows. If they drift shut, the holding force is usually in the hinge assembly, not the weatherseal.
- Open the sash partway and stop cranking. Watch whether the sash moves while the crank handle stays still.
- Inspect the hinge arms and track for loose screws, elongated mounting holes, bent arms, or metal shavings.
- Crank the window through a full open-close cycle and feel for skipping, popping, or a dead spot in the operator.
- Check whether the sash is square in the frame or rubbing hard at one corner, which can overload the operator and make the window drift.
- Tighten any obviously loose mounting screws into solid material, then test again.
Next move: If tightening hardware restores normal holding, the issue was looseness at the hinge or operator mounting points. If the sash still drifts with the crank stationary, the window hinge friction hardware is the likely failure. If the crank slips or skips, the operator is the stronger suspect.
Step 5: Make the repair decision and stabilize the window until it is fixed
Once you know whether the problem is balance hardware, a pivot shoe, or casement hardware, the next move is straightforward. The key is not to keep using a window that can slam shut or rack the sash.
- If a sliding window has a failed window sash balance, replace the matching balance hardware using the old part's style, length, and connection details as your guide.
- If a tilt-in sliding window has a cracked or disconnected window pivot shoe, replace the shoe and confirm the pivot bar seats fully on both sides before testing.
- If a casement or awning window drifts shut with the crank staying still, replace the worn window hinge friction hardware.
- If the crank skips, binds internally, or will not hold the sash under load, replace the window operator after confirming the sash is not badly out of square.
- Until the repair is done, keep the window closed and locked or use only temporary support that cannot slip into the track or strike the glass.
A good result: The sash should hold its position without dropping, twisting, or drifting, and it should move smoothly through normal travel.
If not: If new hardware does not solve it, the sash or frame is likely out of square, damaged, or swollen enough that a carpenter or window pro should inspect the opening.
What to conclude: A successful repair confirms the support hardware was the real fault. If the problem remains, the issue has moved beyond a simple hardware replacement.
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FAQ
Why does my double-hung window keep sliding down?
Usually because a window sash balance has failed or one side is no longer connected correctly. If the sash drops crooked or one side feels heavier, that is the first place to look.
Can I just lubricate the track to make the window stay open?
Not usually. Cleaning a dirty track can help a sticky sash move properly, but lubrication will not restore a worn-out balance or broken pivot shoe. Too much oily spray can also attract dirt and make the track messier.
Why does my casement window drift shut after I open it?
That usually points to worn window hinge friction hardware. If the sash moves back but the crank handle does not turn with it, the hinge side is the stronger suspect than the operator.
Should I replace both window balances or just the bad one?
If one balance is clearly broken, replacing the pair is often the better call on an older window. The new side will be stronger than the worn side, and matched support helps the sash stay level.
When is this more than a hardware problem?
If the sash is badly out of square, the frame is twisted, screws will not hold, or you see rot or swelling around the opening, the problem has moved beyond a simple hardware swap. At that point, a carpenter or window pro should inspect the opening and sash condition.