If you have put fixing straps on the windows to fit them you might have a screw going into where the show runs, this would stop your sash sliding up. It’s also possible that after fitting you’ve had shutters, blind hooks or anything else screwed to the outer frame of the window. The screw could’ve gone into where the shoe runs, which again would stop your sash from sliding past this screw.
Heaton Estate, Bradford Road, Bailiff Bridge, Brighouse, West Yorkshire HD6 4BW
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