How to Repair a Cracked House Window

If you need to repair a cracked house window, you'll need a few basic tools and some window glazing compound. The most difficult part of the job is removing the old broken glass without getting yourself cut up. If you can manage to do the job yourself, you can not only get the window repaired more quickly, but also save the cost of a service call by your local glass repair company.

Things You'll Need

  • Stiff putty knife
  • Heat gun or hair dryer
  • Drill and putty chaser attachment
  • Duct tape
  • Water-based caulk window glazing
  • Flexible putty knife
  • Glass cutter
  • Glazier's points
  • Fine sandpaper
  • Rag
  • Soapy water

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Cover the breaks in the glass pane with duct tape. Remove the putty from around the broken window. Heat the putty with a hair dryer or heat gun. Scrape the softened putty from the frame with the stiff putty knife. Lift the old broken pane out of the frame in one piece. The duct tape will prevent it from further shattering.

Measure the inside of the frame with a tape measure and cut the new window pane 1/8 inch smaller all around with a glass cutter to allow the glass to fit in the frame without binding.

Lay a thin bead of caulk glazing around the inside the frame to create a bed for the window pane to rest in. Lift the new pane and press into the frame.

Press glazier's points into the frame in front of the glass with the edge of the stiff putty knife. Space the points about 6 inches apart.

Squeeze a narrow bead of caulk glazing into lip of the frame over the edges of the window pane. Use the flexible putty knife to press the glazing into the corners. Wet the knife with water to help you smooth the glazing over the top of the glazier's points to make a smooth, angular glaze around the frame of the window.

Wipe the excess putty off the window with a rag and soap and water. Use the sharp edge of the putty knife to trim and scrape off any ragged edges or streaks of glazing. Allow the glaze to cure overnight, then trim and sand any rough edges.

Tips & Warnings

  • Wear leather gloves when handling broken glass.
  • Wear face protection when removing the broken window pane.


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