How to replace a sash cord is a lot easier when you understand the mechanics of a double hung window. Every double hung window has two sashes, the top and the bottom. The frame that secures the glass is a sash. The sides of that frame are the jambs. Sash weights sit in back of the jambs. They are connected to a cord pulley system. The weights keep the windows balanced and easy to open.
Stops or wood moldings attached to the jambs create grooves that a sash window uses to slide. In order to remove the frame you need to pry the parting stop and the inside stop from the jambs.
Before you start this project, make sure you have the correct tools and material readily available. You will need new sash cord, a putty knife, a hammer, a utility knife, putty, finishing nails, paintbrushes and in case you chip away the paint, enough paint to touch it up.
Take the stops on each side of the lower sash off. Using your putty knife, place it close to each nail that is securing the stops and pry it gently away from the frame. The wood splits easily so take extra care to work patiently.
Once the inside stop is removed the window can be easily pulled out. With the framework out, remove the broken cord from its fastened slot. Remove the access panel if there is one. Removing the access panel allows accessibility to the weight. If there is no access panel, removing the window casing on the sides will be the only way to get to the weight.
Sometimes these panels have layers of paint on them, you will need to chip the paint away to locate the screws that are keeping the panel secure. Once the panel is out, cut off any remaining cord. Feed the new sash cord over the pulley and down into the cavity that holds the weight until you can see it in the access panel. The new cord should be tied to the weight with a strong knot but not too bulky as it can bind in the window frame. Put the weight back in the cavity and put a knot in the other end of the cord allowing the weight to hang three inches above the windowsill when the window is in a fully raised position.
Reinstall the frame, with the finishing nails secure the stops. You may need to fill in any gaps with putty and touch up any paint that chipped in the removal process. The project is now complete and you should have a window that once again opens easily. How to replace a sash cord is not as difficult as it may sound.
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