Q: I would like to replace my old wooden double-hung windows with new wooden double-pane windows, retrofit if possible. Do I need to take out the old sash, plus stops, then replace them with a complete new window unit, squaring with shims and screwing it into the old opening? Or can I make the replacement with just the new sash and glass and stops only. In this case, why do I need shims or screws? A: Replacing your old single-glazed windows with new, more energy-efficient double-paned glass is a good idea – and a good do-it-yourself project. First, a quick course on window nomenclature. A sash is the frame the window goes in. Sashes are almost always made of wood, steel, aluminum or vinyl. Stops are the narrow strips of wood that the sash butts against to hold it in place. If w...
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