Will Stanton, owner of Old House Carpentry LLC founded in 1988, to provide repair, renovation and respect for old houses in Delaware County, PA. Currently back in Rutledge PA.
This turn of the century [1900] technology is simply obsolete now. In order for sash weight windows to slide up and down easily they must be loose, side to side, especially if the opening is out of square. There is no effective way to weather-strip them and still have them work. Try this on your window- grasp the bottom sash in the center of the meeting rail and pull toward you and then side to side feel the play? As the sash go up and down they rub on the parting bead [the piece in the jamb that separates the top from the bottom sash] and on the interior and exterior stops.
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