Having a basic understanding of double hung windows will help when learning how to replace a sash cord. There are two sashes on a double hung window, the upper and lower. The framework that holds the glass in place is the sash. The two sashes slide up and down in the window frame. The jambs are the sides of the frame. Sash weights are heavy oblong shaped pieces of metal that connect to a rope-and-pulley system. They sit in a cavity behind the jambs. The windows are easy to open due to the counterbalance the weights provide.
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.
To begin this project, gather the materials and tools you will need to replace a broken sash cord. This includes new sash cord, a putty knife, a utility knife, finishing nails, a hammer, putty, paintbrushes and paint for possible touch-ups.
To gain access to the cord you need to remove the inside window stop from the sides of the frame. Position the putty knife at each nail holding the stop in place and slowly move it back and forth until you are able to pry the stop off. Be careful not to split the wood.
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.
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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