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How to Replace Window Panes

A damaged window pane could cause a lot of trouble. It could be a chance to upgrade to energy-efficient windows or insulated ones, and reap benefits such as improved comfort, higher resale value and reduced utility costs.

You can do it yourself at only a fraction of the cost it would cost to hire an expert. It requires the right tools and only an hour or two of your time.

Glass

If your single-pane windows replacement glass are old, deteriorating or broken replacing them with modern glass that is tempered or insulated will increase energy efficiency and decrease noise while preserving the original character of older homes. A majority of homeowners with hand tools can replace a window pane. You will also need an extra window pane, glazier's tips pliers, and latex glazing putty. If needed you can use a heating gun to warm the old putty. Wear safety glasses and gloves before you begin. Working with broken glass can cause serious injuries.

Take away any broken glass pieces that remain. It is recommended to use pliers for this, but a flathead can be useful equally. Make use of a wood chisel or putty knives to remove any remaining old putty around the frame and the window sash. Work slowly and carefully making sure not to damage the old window sash. It is recommended to do this on a stable ladder rather than on the ground and have someone standing below the sash in order to help hold it in place.

Once you've removed all the old putty, prepare the window frame to fit the new pane. Find the width and the height of the opening in the sash, subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be sent to an hardware or home centers store to have cut a piece of glass that is in stock to the correct size. You can also cut the replacement glass in windows yourself if have the right tools.

After installing the glass After installing the glass, apply a small amount of caulking to the edge. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will ensure the pane. The points shouldn't be so tight as to cause friction between the sash and frame but they should not be too loose.

Before applying the putty to the surface, gently knead it until it is soft and free of lumps. Then you can roll it into pencil-sized strips. The first strip should be placed in the corner of the frame, working from one corner to the next so that it is even and smooth.

Glazier's Points

The glazier's points are tiny triangular pieces of steel that allow glass to be secured to the frame without causing damage to the delicate surface. It's easy to understand how to use this hidden tool, and you'll save money on the expense of a professional installation.

After getting rid of the old putty glazier points, and any other residue, clean the frame thoroughly using a utility knife. Lightly sand the frame in the rabbet grooves if needed to smooth out rough areas. If you decide to sand wood, protect it with painter's tape to protect it from damage caused by accidental sanding.

Measure the empty frame's dimensions and record precise measurements. These measurements can be brought to the hardware or home center store and the new pane will be cut a bit smaller. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new pane in the frame and push it into place firmly using your hand. Then, you can use the point of your chisel or back end of the putty knife to pierce the glazier's facets, as shown in Figure 11. The glazier's point should be aligned with the top edge of your pane and the raised shoulders should be just below the lip.

Apply a small amount of glazing compound over the edges of the new glass and in the rabbet grooves, to seal and protect them. Let it dry and cure completely.

Install the new window sash after the glazing compound has dried. First, saturate the wood with a heavy coat of linseed oil. This will prevent the new putty from sucking in the moisture and deteriorating and cracking over time. Use a brush to apply this coat, or the point of the blade. Then use the chisel on the back of the tool or the back of the putty handle to gently smash the new sash or glazier's tip into the grooves of the rabbet. Repeat this process at intervals of 10 inches all around the frame.

Putty

A baseball thrown at you or a rock that is errant or a fallen branch can cause a window pane to crack or break. Most windows can be replaced easily by installing a new piece. The glass is held in place by a small metal clip, referred to as a glazier's point and putty. This compound is also known as glazing compound. Remove the old pane and clean the area with an abrasive, scraper that is a pull type or a wood chisel. Wear protective glasses and gloves when working. You'll need a heating gun in the event that the window is glued to the frame.

If you're planning to install the original sash, remove the molding pieces that secure the old pane. Sand the sash until it's flat and ready for new caulk. Once the sash is installed it is possible to apply a silicone caulk over the glass. This will ensure that it doesn't be leaking or fade over time.

Remove the glazing points in the rabbets. These are the grooves in the sash, where the glass is. If they're hard to cut, place the hand tool, such as a heatgun over them to allow them to soften before. When using a heated tool, be careful to avoid damaging the sash's railings and sash.

Prepare a bed for your new pane after removing the old glaze and putty. Roll a rope of glazing compound between your fingers, and then make it about 1/2 inch thick. Then, push it into the rabbets, where the glass will sit. The glass should rest against the putty on both sides. If you need to, lightly tap your glass into the rabbet with your thumb.

If the new pane is cracked you can fill it with a solvent-based glass glue or silicone caulk before pressing it into the sash. If the crack is not sealed, you will need to apply putty to keep water from getting in. Once the putty is dry remove the oily film from the glass and allow it to dry completely before painting. Paint before the putty has dried completely. It will not form a good seal and may discolor or leak over time.

Paint

If you've had a broken window pane, then you may be worried about the cost of a new one. But the truth is that replacing a single glass pane doesn't have to break the bank If you can do it yourself. Even double-paned windows can be replaced at a fraction of the cost it would cost for a professional.

If you are working on a large-sized window, make sure it is securely fastened to the frame. Using the proper tools and techniques, you can complete this task easily and fast.

When you are ready to start taking down the old window pane. Remove the metal glazing points attached to it. These are basically small metal triangles which function as "nails" that hold the window in place within the frame of wood. They are placed under a bead or glazing putty that sets to form solid wedge that holds the frame firmly in position and conceals the edges.

After you have removed the old pane taken away Clean up the frame and wood. Scrape off any paint and sand down the rabbet grooves where the glazing points were. Sand them down to bare wood surfaces, so that you can paint the frames with the same shade. After the sanding process, apply a coat of flax oil to the bare wood to prolong its life.

The next step is to determine the size of the window opening. It is necessary to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure that you get a precise size for the new pane. This will allow for seasonal changes in the glass. Bring these measurements to your local hardware or home improvement store and ask them to cut you a piece cut for you.

Now, it's time to bed the new window pane. To do this, place the pane inside the frame and move it around until a 1/16 inch of putty remains between the edge of the glass and the sash on all four sides. Use a putty knife to smear the putty evenly, making sure that there isn't an excessive amount of excess putty in the corners and along the edges. When the putty dries, it can be painted with the same color as the frame to prevent water and air from leaking into the frame and causing fogging.