How to Replace Window Sash Cords and Adjust Weights for Optimal Window Balance

Replacing worn or broken window sash cords is a common home maintenance task that can restore the smooth operation of double-hung windows. In addition to replacing the cords, it’s important to ensure the window weights are properly adjusted to provide the right amount of counterbalance for the sash. By following these steps, you can revive your old windows and enjoy easy, effortless operation.

Gather Necessary Tools and Materials

To replace window sash cords, you’ll need the following tools and materials:
Screwdriver
Hammer
Utility knife
Cotton sash cord or nylon cord (length determined by window size)
Sash weights (if missing or damaged)
Gloves (for handling old weights)

Remove the Window Sash

Remove the stop beads holding the sash in place using a screwdriver.
Lift out the sash and set it aside in a safe place.

Access the Weights and Pulleys

Locate the access panels on the sides of the window frame and remove any screws or nails holding them in place.
Reach in and remove the old weights, noting their size and weight for replacement purposes.
Examine the pulleys to ensure they are in good working condition and can freely rotate.

Measure and Cut the New Sash Cords

Measure the length of the window opening from the top of the sash to the bottom of the weight pocket.
Add an extra foot to the measurement to allow for knots and adjustments.
Cut two lengths of sash cord to the measured length using a utility knife or scissors.

Feed the Cords Through the Pulleys

Tie one end of each cord to its corresponding weight.
Feed the other end of the cord through the pulley hole and down into the weight pocket.
Pull the cord until the weight is lifted about an inch off the bottom of the pocket.
Mark the cord at the top of the pulley and at the desired knot location on the sash.
Cut the cord, leaving about an inch below the mark for the sash knot.
Tie a tight knot in the end of the cord, ensuring it’s small enough to fit through the sash knot hole.

Attach the Cords to the Sash

Place the sash on a flat surface with the exterior facing up.
Insert the knotted end of the cord into the knot hole on the side of the sash.
Secure the cord in place with a small screw or nail, ensuring it can slide freely.
Repeat on the opposite side of the sash.

Reinstall the Sash and Adjust the Weights

Place the sash back into the window frame and reinstall the stop beads.
Adjust the weights by adding or removing weight until the sash stays open at any position without assistance.
Once the weights are adjusted, close up the access panels and secure them in place.

Troubleshooting and Maintenance

If the window is difficult to open or close, the weights may need further adjustment.
Periodically check the sash cords for wear and replace them as needed.
Lubricate the pulleys with a silicone spray to prevent squeaking.
By following these steps and maintaining your window sash cords and weights, you can ensure your double-hung windows operate smoothly for years to come. Remember to take safety precautions when working with old weights, as they may contain lead. If you’re unsure about any aspect of the process, it’s always best to consult with a professional window repair specialist.