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.
There are a series of moldings along the jambs creating channels for the sashes to slide. The piece of wood that separates the upper and lower sashes and the one that holds the bottom sash in place can be easily loosened and removed. They need to come out to remove the sash.
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.
With the stops removed, the frame should come out easily. Remove the damaged sash cord from its slot. Most sash windows have an access panel to get to the weight. The access panel will need to be removed; if there no access panel then the side window casing has to be taken out 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.
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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