Old windows won't open or stay open? It might be the sash cords. Here's how to fix them.
Time A day
ComplexityIntermediate
Cost$40-$60
Introduction
Old windows often have broken sash cords so they won't stay open. Here, we'll show you how to fix them.
Another common way to restore old windows is replacing the sash cords. Connected to weights that sit in cavities on each side of the window, these cords allow you to raise the window and hold it in place so it doesn’t come crashing down.
Over time, these cords wear out, so it’s important to replace them with the correct type of cord. Norbert Rodriguez, owner of Quaint Milwaukee Window Restoration, recommends a 3/8-inch cord unless your older home has extremely heavy windows. If your window is 60 to 80 pounds, go with a 1/2-inch cord or chain.
The two weights already in the sashes are probably the right ones. To double check, weigh the sash by placing it on a scale, then make sure the two weights total that of the sash. So if your sash is 14 pounds, each weight should be seven pounds.
Here’s how to replace a broken sash cord.
Tools Required
- Carbide paint scraper
- Gloves
- Hammer
- Moulding pry bar
- Rubber mallet
- Safety glasses
- Screwdriver
- Shop vac with HEPA filter
- Utility knife
Materials Required
- 3/8” Sash cord
- Nails
Watch How to Replace a Window Sash Cord
Project step-by-step (6)
Step 1
Remove the sash
To remove the sash, take off the front stops (they’re usually screwed in). Start by scoring paint lines or caulk with a utility knife. Remove the stops with a moulding pry bar. You may need a rubber mallet to wedge the pry bar between sash and stops.
Step 2
Disconnect sash cords
Detach sash cords from the sash. Remove the lower sash from the window frame first, then the upper sash.
Step 3
Access sash weights
Use a screwdriver to open and remove the doors on each side of the cavities to access the weights. Remove both weights.
Step 4
Attach sash cords to weights
To feed the new sash cord through the pulley system down the cavity, attach something small to the end of the cord so it doesn’t get stuck. Pull the cord through, then tie the end to the sash weight. Let the remaining end of the cord hang to about the meeting rail and cut it.
Repeat on the other side. Close up the doors of the weight cavities with a screwdriver.
Step 5
Attach cords to the sash
Pull on the cords so there’s tension and the weights go up near the very top. Line up the cords to the sash. Attach both cords by tying knots at the ends and placing them into cord slots on each side of the sash. Drive a screw or staple through the knot so the cords stay in the slots. Cut off excess cords.
Step 6
Mount front stops
Reinstall the front stops with screws and test out the window.
