Single and double-hung windows operate with the help of a balance that allows the window to open and close smoothly as well as remain open. Today’s windows typically use a block and tackle balance system that is installed with the jambliner. If you have older windows, however, you may see something different when you look into the window frame.

A cord and weight pulley system was originally used to operate sash windows. The cord and weight system operate in a box that is concealed within the window frame, though in some windows, the mechanisms are visible, which can add some old-world charm to the window design.

When it’s time to replace sash window cords, you’ll likely use the original pulleys and weights as both components are more durable than the sash window cords. Replacing sash window cords can restore your window to working order without having to replace the entire window. Let’s take a look at what can go wrong and then explore a window sash cord replacement.

Sash Window Cord Problems

Sash window cords are made with braided fabric, typically jute, nylon, cotton or cotton with a nylon core, which can run into two different issues. The cord can stretch over time, causing the weight to rest on the bottom of the window frame when the lower sash is raised rather than holding tension against the sash to hold it in place. This is less of an issue with the upper sash, and it may continue to function normally even with a stretched cord as long as the cord doesn’t reach the bottom of the frame before the window is raised all the way.

Another issue with sash window cords is that they may eventually break. If the sash window cord breaks, the sash won’t operate the way it’s supposed to with the upper sash likely unable to remain closed and the lower sash unable to remain open.

How to Replace Sash Window Cords

Replacing window sash cords that are old or damaged can be done by DIY homeowners and professionals alike. Follow these steps to replace sash window cords:

1. Remove the jambliner or access hatch to reveal the weights, cord and pulley system. If the window has been painted, score the seams so you don’t damage the surrounding paint when you pull off the jambliner.
2. Remove the damaged rope by cutting it or untying it from the weight.
3. Run the new sash window cord over the pulley and lower it until it reaches the lower part of the window jamb and you can grab it. You may need to attach something to the end to weigh the rope down, like a few nuts or small weights. 
4. Repeat Step 3 on the other side.
5. If you are replacing the cords for the upper and lower sashes, repeat Step 3 and Step 4 with each pulley.
6. Attach each rope to its weight.
7. Pull on the rope until the weight is in its highest position.
8. Line the rope up with the channel in the sash frame and tie a knot in line with the hole or notch in the sash frame that is meant to secure the rope.
9. Secure the knot to the sash frame with a small nail.
10. Cut any excess rope.
11. Repeat these steps on the other side and for the other sash.
12. Replace the sash frame in the window frame.
13. Replace the access hatch or jambliner.
14. Test the window.

Improve Window Sash Durability with Fenster

If the window sash cords are stretched or broken, it’s likely time to look at the entire window and assess any repairs that need to be made or parts that need to be replaced, and our team of professionals at Fenster can help. We created a quick checklist of parts to examine for potential repairs or replacements:

• Sash: If the sash cord and weight balance need to be replaced, this is the perfect time to assess the sash itself. Before beginning the project, take a look at the sash to see if there is any visible damage to the sash frame. Look for chipped paint, wood rot, swelling, insect damage or anything else that may need attention.

• Glass: Broken glass is typically noticeable, but other glass issues may go unnoticed on a daily basis. Inspect the glass for small cracks or any fogginess that suggests it’s allowing moisture in.

• Hardware: Check the locking mechanism and lift handle to make sure they are firmly attached to the sash frame.

Here at Fenster, we want to make the replacement process as easy as possible. That is why we offer sash replacement kits that can be installed in place of defective, old or damaged sashes. We also offer balance kits for block and tackle balance systems.

Contact our experts today to discuss window replacement options. You can also check out our Hints, Tips & Helpful Information page to view pro tips on how to measure, get help with troubleshooting and find our catalog and order forms. We look forward to working with you and getting your windows back in tip-top shape!