When a pane of window glass breaks, you may be able to replace it yourself. First, clean out all the broken glass from the windowpane. Wear gloves and safety glasses. Use a wood chisel to remove any remaining glass shards and window glazing (figure A). Glazing can become hard and brittle over time. If you're having trouble removing it, try softening it with a heat gun (figure B). Measure the length and width of the opening (figure C), and subtract 1/16" from each measurement. Have a pane of glass cut to that size at your home center or glass-supply store. Be sure to use glass that's the same thickness as the other panes. Set the new pane in place, and secure it with pushpoints (figure D) around the perimeter. Use a chisel to press the pushpoints into the wood frame. Apply window glazing (figure E) around the edges of the pane to seal out the weather. Soften the glazing in your hands, and roll it into a long bead. Press it into place in the corners of the windowpane (figure F). After the glazing is in place, smooth it with a putty knife (figure G). Clean the glass, and allow the glazing to dry. Then prime and paint it to match the window frame.
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