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.
Make sure you have all the tools and materials necessary before starting your project. Your list should include a hammer, finishing nails, a putty knife, putty, a utility knife, paintbrushes and enough paint for touch-ups if necessary.
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 moldings are off, pull the sash out. You can remove the broken sash cord from its keyed slot. There should be a panel which allows access to the sash weight, remove it. If no panel exists, you will need to remove the side window casing to access the weight.
Painted over access panels will mean chipping the paint to determine where the screws are that hold the panel in place. You may need to score painted edges with the utility knife in order to lift the panel out. Once the panel is removed, any remaining cord should be cut off. Thread the new sash cord over the pulley until it appears in the access panel. Tie the new cord to the weight making sure the knot is sturdy but not bulky as it can get stuck in the window frame. Place the weight back into the cavity. Tie a knot to the other end of the cord to make the weight suspend three inches above the bottom of the sill when the sash is in an open position.
Now you are ready to put the framework back into place. Use the finishing nails to secure the moldings. If there are any gaps, you can use the putty to fill them. If any paint chipped away during this process, repaint it. You are done with your project and should have a totally functioning window. As a do-it-yourself homeowner, you can master how to replace a sash cord in your double hung window with the right information.
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