Introduction
Single pane windows can last for a hundred years or more if properly maintained. Learn how to preserve your windows and keep them draft-free by replacing the old window glazing putty.Comparatively, double-paned windows (also called double-glazed windows) provide up to twice the energy efficiency of single-paned windows. This is because these windows have double the number of glass panes- two. These panes create an air cushion between them, providing better insulation and preventing drafts from entering and leaving your home. However, if you have an old home, like mine, you likely have single-pane windows.
On older single-pane windows, the glass is usually surrounded by putty called “glazing compound,” which holds the glass in place and seals out the weather. This putty often lasts decades, but over the years it becomes rock-hard, cracks and even falls off the window. Loose or missing compound lets wind and rain leak in around the glass.
Replacing the window glazing putty around one pane of glass will take 15 minutes to an hour, depending on the size of the pane and the stubbornness of the old putty. Replace broken glass while you’re at it. This adds only a few minutes and a few dollars to the job—much cheaper than calling a glass repair service.
It’s possible to replace glass and putty with the window in place, but you’ll save time and get better results if you can remove the window and clamp it down on a flat surface.
If you have a broken or cracked window pane, get it out of the way before you remove the old putty. Put on heavy gloves and eye protection, place a cloth over the broken pane and tap it with a hammer. With the glass thoroughly broken up, pull the shards out of the frame by hand. Pull out the old glazing points with pliers. If the old glass is in good shape, leave it in place.
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