Though the parting strip probably wasn’t nailed in place, you may have to cut through numerous layers of paint to free it. Score the paint line with a utility knife or scraper. Now, with the upper sash raised, loosen the bottom of the parting strip. Grasp it with locking pliers and wiggle it back and forth while pulling. Lower the upper sash and repeat the process at the top.

Professional tip
Pad the jaws of the locking pliers with cardboard to protect the parting strip.

Without the old paint to hold it, you may have to nail the parting strip back into place. Use small (4d) galvanized finishing nails. Don’t be surprised if you break the strip despite your best efforts. You can get replacement stock at a good lumberyard.

Sometimes the upper sash has a small felt and metal weather-strip on the face of the top rail. This can make it hard to remove the parting strip. If your window has one of these weather-strips, remove it first or you’ll break the parting strip.

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