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How to Replace Window Panes

A damaged or cracked window can be a nuisance. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows to reap benefits like more comfort, higher the value of resales and lower utility costs.

You can do it yourself for a only a fraction of the cost it would cost to employ an expert. You only need the appropriate tools and a few hours of your time.

Glass

Replace your old single-paned windows using tempered or insulate glass to improve energy efficiency, reduce noise, and maintain the original character of your older home. The majority of homeowners with basic hand tools can repair a window pane. You'll also require a replacement glass for window 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 goggles and gloves prior to starting. Working with broken glass could result in serious injuries.

Take out any broken glass pieces remaining. This can be done with pliers, but flathead screwdrivers can be effective in a pinch. Use a wood chisel, or putty knife to get rid of any old putty that remains around the frame and window sash. Take your time and work slowly making sure not to break the existing window sash. This is best done on an elevated ladder, not on the ground. Also, ensure that someone below the sash hold it steady.

After you have removed all the old putty, you can prepare the window frame for the new pane. Take measurements of the width and height of the opening in the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be sent to a hardware or home center store to have cut a piece of glass that is in stock to the correct size. You can also cut the glass by yourself if you have the appropriate tools.

After putting in the new pane, run a small bead of caulking along the edge to ensure it is weatherproof. Then, you can install a glazier's pointing on the frame's opposite side to secure the pane into its place. The points shouldn't be too tight that they cause friction between the frame and sash, but they also shouldn't be loose.

Before applying the putty make sure to knead it until it is soft and free of lumps. Then, roll it into pencil-size strips. Apply the first strip to the corner of the frame. Work from one corner to another and ensure that it is even and smooth.

Glazier's Points

The glazier’s points are small triangular pieces of metal that allow glass to be secured into the window frame without causing damage to the delicate surface. Learning how to use these tiny helpers is simple and could save you money on professional installation or the cost of purchasing new glass.

Once the old putty and glazier's points are removed Clean the frame thoroughly with a knife to eliminate any remaining traces. If needed you can lightly sand the wood along the grooves of the rabbet to smooth out rough spots. If you do sand the wood, ensure you protect it with painter's tape to avoid accidental damage.

Note down the exact dimensions of the frame. Take these dimensions to a hardware store or a home center and request that the new pane cut slightly smaller than the frame's opening. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new window replacements in the frame and push it in place with your hand. Use the chisel's point, or the back of the putty knife to smudge the glazier's points, as illustrated in Figure 11. After you're done, the points should be in line with the top edge of the pane. the raised shoulders of the points should be just below the lip of the rabbet groove.

Apply a thin layer of glazing compound to the rabbet grooves and the edges of the new glass. This will protect and seal the edges. Allow it to dry completely and cure.

After the glazing compound dries and the glazing compound is dry, you can install the new window sash. First, saturate the wood with a heavy coat of Linseed oil. This will prevent the newly-created putty from drying out or cracking as it absorbs moisture. Use a brush to apply this coat, or even the tip of the putty blade. Then, use the chisel on the back of the putty 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 every 10 inches around the frame's perimeter.

Putty

A baseball thrown or a rock thrown in error, or a fallen tree can cause a broken or cracked window. Fortunately, the majority of windows can be replaced by simply putting a new piece in the proper place. The glass is held in place by a small metal clip called a glazier's point, and putty, also called glazing compound. Before you install a new pane, first get rid of the old one and clean up the area using the help of a rag, an abrasive scraper that is a pull type or the wood chisel. Wear protective glasses and gloves when working. You'll require a heat gun when the window is fixed to the frame.

If you're planning to reinstall your original sash, remove the mold that holds the old pane. Then you can sand the sash down to make sure it's flat and ready to be re-caulked. After the sash has been re-installed, apply a new silicone caulk around the glass to ensure that it will not leak or change color over time.

Remove the glazing points from the rabbets, or the grooves in the sash where the glass sits. If they're difficult to cut out, you can try holding an instrument like a heat gun over them to soften them before you do. When using a heat tool, be sure to not damage the sash's railings and sash.

After the old points of glazing and putty have been removed, prepare a bed for the new pane. Roll a rope of glazing compound between your fingers and make it about 1/2 inch thick. Then, push it into the rabbets in which the glass will rest. It is essential that the glass is positioned against the putty on both sides So if you have to tap it, gently press the glass into the rabbet using your thumb.

If the new pane has cracked, you can apply the silicone caulk or glass glue based on solvents to fill in the crack prior to pressing it into the sash. In other cases, you'll need to putty over the crack to create a tight seal and keep water out. After the putty has dried, clean the oily film off the glass using a rag and allow it to dry completely prior to painting. Paint before the putty has completely dried. It won't form a good seal and could leak or discolor with time.

Paint

You may be concerned about replacing a broken pane of glass. However, replacing one glass pane does not have to break the bank If you can do it yourself. In fact, even a double Glazing windows replacement-pane window can be replaced for less than the cost of an expert.

If you're working with large glass windows first, ensure that it is securely attached to the frame. This can be done relatively easy and fast using the appropriate tools and techniques.

If you're ready to begin with the removal of the old window pane by removing the metal glazing points that are connected to it. They are basically tiny metal triangles that function as "nails" that hold the window in within the frame of wood. They are buried beneath a bead or glazing putty that sets to form solid wedge that holds the wood frame in place and hides the sharp edges.

After you have removed the old pane removed Clean up the frame and wood. Scrape away any paint and sand down the rabbet grooves where the glazing points used to be. These should be sanded to bare wood, to allow you to paint them the same color as the rest of the frame. After the sanding process, apply a coat of flax oil on the wood's surface to help extend its lifespan.

Next, measure the size of the window's opening. You will need to take vertical and horizontal measurements of the entire opening, as well as the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure you get the exact measurement for the new pane. This will also allow for expansion and contraction of the glass in times of seasonal change. You can take these measurements to a hardware or home improvement store and have the glass 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.