If a window becomes cracked or otherwise broken, it should be replaced immediately. Though many people call a professional, this project is actually easy to do yourself. If requires only a few hand tools and a careful approach. Once you have replaced one glass windowpane in your home, you will not be afraid to tackle this project in the future.
You will need:
• Glass window pane
• Glazing tool
• Thin scraper
• Glazing points
• Glazing compound
• Putty knife
• Needle nose pliers
• Pry bar
• Heating gun or mineral spirits (optional)
• Painter’s tape
• Tape measure
Step 1: Use the tape measure to take vertical and horizontal measurements of the window. Take these to a glass or glazing shop so an appropriately sized piece of glass can be cut.
Step 2: Remove the window trim with the pry bar. Lift the window sash out of the window frame and take it to a flat work surface.
Step 3: If the window has a wooden frame, a piece of wood may anchor the windowpane in place on the sash. Use your putty knife to pry up this wood and then carefully remove and save it for reinstallation.
Step 4: Remove all glazing compound from the windowpane with your putty knife. If the compound is hard, use a heating gun or mineral spirits to soften it. When using the gun, take care not to heat glass too much or it could shatter. Once all the compound has been removed, lift out the windowpane.
Step 5: Put some glazing compound on a clean putty knife and spread it uniformly and evenly around the edges of your new windowpane.
Step 6: Place the new windowpane into your window frame and press it into place firmly. Create a good bond by applying even pressure along all edges. Use the pliers to put glazing points into joints at two-inch intervals to secure the windowpane into place.
Step 7: Take a handful of glazing compound and roll it to create a thin rope. Press it into the edges of the windowpane, squeezing it into the joint between the wooden frame and the pane. Smooth this compound and remove excess with the glazing tool. When doing this, maintain a 45-degree angle with the tool. Use the scraper to carefully remove any compound extending more than ¼ inch from the edge of the windowpane.
Step 8: Apply painter’s tape to the edges of the pane. Paint the glazing compound the same color as the window frame to blend it into the frame.
Step 9: If the frame featured thin wood trim to hold the glass in place, reinstall this or create new trim if existing trim is rotten or was damaged during removal. Paint the trim so it blends with the window frame.