Introduction When a window binds or refuses to budge, don't try to force it. Instead, take a look around the sash, both inside and out. Chances are, you will find that paint has sealed the window shut or that a stop molding has warped. Both difficulties usually respond to the gentle prying techniques demonstrated in the following pages. With double-hung windows, the culprit could be a faulty spring lift or a broken or jammed sash cord. Replacing these involves dismantling the window.

In a double-hung window, both sash move up and down on side channels. In single-hung units, only one sash moves.

Freeing a stuck sash To break a sash sealed by paint, run a sharp utility knife several times between the sash and stop.
Using a pry bar As an alternative, pry from the outside edges with a pry bar and protective block. Work inward from edges until the sash pops free.
Using a hammer and wooden block If a sash is binding between its stops, try separating the stops slightly by tapping along their length with a hammer and wooden block.
Preventing future problems Once you get the window moving, lightly sand its jambs, then lubricate with paste wax, paraffin wax or a candle, or bar soap.
Adjusting spring lifts Tube-type lifting devices house a spring-driven twist rod that helps lift the sash. To improve sash movement, you can adjust the spring devices as shown in the following page. But before tampering with these, check to be sure the window has not been painted shut. If it has, follow the procedures described earlier. If the device doesn't seem to be working at all, it is probably broken, and you'll need to replace it. To begin, grip the tube before you remove the screw holding it to the jamb, or the spring will unwind in a hurry.
Tightening a spring lift If the window sails up too easily, hold the screw and let the spring turn a couple of revolutions.
Loosening a spring lift If the window is hard to raise, tighten the spring by turning it clockwise. You may need to adjust both lifts.

BHG