A crooked window sash is most often caused by a pivot bar that has slipped out of its balance shoe on one side, a worn balance, or a tilt latch that isn't fully engaged. On sliding windows, a worn roller on one end is a common culprit. Less often, the window frame itself has shifted out of square.

At The Window Depot, homeowners and contractors in Tucson, Phoenix, Chandler, Surprise, El Paso, Albuquerque and National City often find that a crooked sash is a quick fix once they know where to look. Here's how to narrow it down.

What Does a Crooked Window Sash Look Like?

A crooked sash sits higher on one side than the other, or leaves a wider gap along one edge of the frame. You might also notice it rubbing on one side, closing unevenly or making the lock hard to line up.

On single-hung and double-hung windows, a sash that suddenly drops at one corner after you tilt it in for cleaning is the classic sign that something came loose.

What Causes a Window Sash to Sit Crooked?

Match what you're seeing to the likely cause.

A slipped pivot bar

Most tilt-in sashes have a small metal pivot bar on each bottom corner that rides in a balance shoe inside the jamb. If one pivot bar pops out of its shoe, usually during cleaning, that corner has nothing supporting it and the sash hangs crooked.

A worn or broken balance

The balances on each side carry the sash's weight. When one wears out, that side sags. Our post on window sash balances covers the signs and types in more detail.

Tilt latches that didn't catch

The tilt latches at the top of the sash hold it upright in the frame. If one doesn't snap fully into the jamb after cleaning, the sash can lean or sit unevenly.

Worn rollers on a sliding window

Horizontal sliders ride on rollers along the bottom track. A worn or broken roller at one end drops that corner, and packed dirt in the track can do the same. Cleaning the window tracks is worth trying first.

A frame that's out of square

If the house has settled or the window wasn't set square in the opening, the sash can look crooked even though nothing is wrong with it. This is less common, and it usually shows up as uneven gaps that don't change no matter how you reset the sash.

How Do You Check a Crooked Window Sash?

Start with the easy checks before assuming anything is broken.

1. Look at the gaps. Compare the space between the sash and frame on both sides and along the top and bottom.
2. Check the tilt latches. Press each latch in and let it snap back into the jamb. Make sure both are fully seated.
3. Tilt the sash in and look at the bottom corners. See whether both pivot bars are sitting in their balance shoes.
4. Compare both sides. Hardware that looks different on one side than the other usually points to the problem.
5. Check the frame for square. For contractors or confident DIYers, measuring the frame diagonally corner to corner in both directions tells you a lot. If the measurements differ noticeably, the frame may be out of square.

Don't force a sash that binds or won't move. Pushing harder can bend the pivot bar, damage the balance or crack the frame.

Can You Fix a Crooked Window Sash Yourself?

Often, yes. A slipped pivot bar can usually be reset by tilting the sash, lining the pivot bar back up with the balance shoe and lowering it into place. Most windows' manufacturer instructions show how the shoe locks and unlocks for that model.

Balance shoes and spring balances can be under tension, so work carefully and follow the instructions for your window. If a pivot bar, shoe, balance or roller is bent or broken, replacing that part usually fixes the problem. Our tips for replacing vinyl window parts yourself cover what to check before buying a part, and our guide to window parts helps you identify what you're looking at.

When Is a Crooked Sash a Bigger Problem?

A sash that has always sat crooked, or one that stays uneven after you reset the hardware, may point to the frame or how the window sits in the opening. A warped or damaged sash is another sign the fix goes beyond a part.

Those situations are worth having a qualified window professional look at. If the frame is distorted or the window has several problems at once, new vinyl replacement windows may be the more practical fix.

How Can You Keep Your Window Sash Straight?

Most crooked sashes happen during cleaning. When you tilt a sash in, support its weight, and make sure both pivot bars and both tilt latches click back into place before you let go.

Keep tracks clean so rollers and balances aren't working against grit, especially after monsoon dust storms in Arizona, Texas and New Mexico. Our window maintenance checklist is a good routine to follow.

Frequently Asked Questions

Why did my window sash go crooked after I cleaned it?

The most common reason is that a pivot bar slipped out of its balance shoe or a tilt latch didn't snap back in. Tilt the sash in and check both bottom corners and both top latches.

How do I fix a window sash that is lower on one side?

Check whether the pivot bar on the low side is seated in its balance shoe. If it is, the balance on that side may be worn and need replacing.

Can a crooked sash cause drafts?

It can. A sash that doesn't sit evenly may not seal against the frame or lock properly, which can let air through.

Does a crooked sash mean the frame is warped?

Not usually. Most crooked sashes come from slipped or worn hardware. A frame problem is more likely if the gaps stay uneven after the hardware is reset.

Should I replace the window if the sash is crooked?

Not unless the frame or sash is damaged. Most crooked sashes can be fixed by resetting or replacing a single part.

Find Parts Help and Replacement Windows at The Window Depot

A crooked sash is usually a hardware issue you can sort out in a few minutes. If you need a replacement window instead, visit The Window Depot in Tucson, Phoenix, Chandler, Surprise, El Paso, Albuquerque or National City to see our in-stock options, or browse vinyl windows online first. Find your nearest location with our store locator.