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A simple sash or stop repair can often restore a window to good working order. If a sash is temporarily stuck because of high humidity, a change of weather may correct the problem. If a sash moves reluctantly, clean the sash channels. Windows that have been painted shut require a little more effort but can be opened, too.
If a window sticks, chisel any dirt or large globs of paint from the channel and then sand it smooth with sandpaper wrapped around a wood block. It also helps to coat the channel with wax so the sash can move easily.
If the window binds against the channel, widen the channel by inserting a wood block at the point that binds and tapping it with a hammer.
1. Score the painted edges of the sash with a utility knife. Work a wide putty knife between the sash and frame. Tap the knife with a mallet.
2. From outside, wedge a prybar between the sill and sash; work alternately at each corner so the sash moves up evenly. Protect the sill with a wood block.
3. Chisel any built-up paint off the edges of the sash, stops, and parting strip. Sand the edges smooth, and apply paraffin to them.
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