This is a hammer: Fixing windowpanes

Q: During a recent party, there was a bit of an incident in the kitchen, and one of the panes in the window above the sink was shattered. I removed the bits of glass and covered the empty space with cardboard, held in place with duct tape. How easy is it to replace just the pane of glass? — Candace G., Ithaca, N.Y.

A: Replacing a single glass pane is a pretty straightforward job, one that can be accomplished quickly once you have the supplies and tools at hand.

You’ll need, of course, a replacement pane of glass. Because the original pane was shattered, the exact dimensions need to be figured out. Do this by measuring the width and height of the frame. Then, subtract 1/16 inch from each side — this will allow a bit of space for the new glass to expand and contract in changing temperatures.

When cleaning up the broken glass, did you save the small metal tabs or spring clips that were spaced around the frame? If so, keep them around to reuse; otherwise, you’ll need to buy replacements. The metal tabs are called glazier’s points and are used in wooden frames; the spring clips are used in metal frames. These help hold the windowpane snugly in place.

Head for the hardware store with measurements in hand. Most stores will sell precut windowpanes in standard sizes that match or nearly match your measurements; otherwise, they can cut the glass to your specified size.

Make sure you have the following on hand for the repair: Window putty (also known as glazier’s putty), a putty knife, glazier’s points or spring clips (for metal frames), a wire brush, steel wool, fine-grit sandpaper and a soft cloth.

Remove the cardboard and tape patch and clean up the frame to prepare it for the new pane. Take out any remaining points or clips and carefully scrape away the old window putty. This may be the most time-consuming part, as the putty may have hardened and adhered to the frame. Be patient and work carefully.

Once the old putty is removed, wipe the frame clean. Then add a new line of putty by forming a ball in the palm of your hand, then rolling it out into a long, thin line about the width of a pencil. Press this line of putty around the edge of the frame on the side on which the new pane will be attached.

Insert the new pane of glass, pressing it against the new putty. Hold it in place with one hand, and with the other hand, insert glazier’s points or clips. Points should be placed every 8 inches around the frame and pressed into the wood using the putty knife or a similar tool. Clips can be placed in existing holes in the metal frame.

Use a little more putty to secure the pane on the side closest to you, by dabbing it into areas where the glass touches the frame. Scrape away excess with the putty knife.

Clean excess or spilled putty from the window and the frame using the putty knife and a wet cloth. Let the putty dry and cure for about four days before painting.

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