Chain May Be Answer to Broken Sash Cords

QUESTION: I have double-hung windows in my home, with cords and no weights, and I’m getting tired of fixing broken cords. Could you tell me how to replace these with springs. What types of springs are available? Also, after I replace the cords and weights, how do I insulate the hollow space and what type of insulation should I use?

h ANSWER: If you like the lifting action of the counterweights on the double-hung window, you should replace the broken sash cord with metal chains, which are available at hardware stores. The chain won’t fray or become brittle with age and break.

You can also replace the weights and cords with metal pressure channels. These channels do not provide lifting action, but they have spring-action strips on both side jambs that hold each sash securely in any position. This ensures a snug fit that prevents rattling and minimizes air leaks.

The first step is to remove the inside trim or stop molding from the sides of the jambs and remove the sashes from the frame. Then, cut off the sash cords, remove the old pulleys and clear any obstructions out of the old channels.

Fit the new channels on each side of the sash. Pick up the sash channels together and place them into the frame. Finally, tack the channels in place and reinstall the trim.

Before installing the channels, the wall cavity for the cord and weights can be insulated by loosely stuffing it with fiberglass or rock wool insulation. You can also pour a loose fill insulation such as vermiculite into the hollows. If the area is inaccessible, you can fill it using aerosol foam insulation.