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How to Replace Window Panes

A cracked window pane can cause a lot of trouble. It could be a chance to upgrade to energy-efficient windows or insulated ones to enjoy advantages like improved comfort, higher resale value and reduced utility costs.

You can do it yourself for less than what it would cost to hire an expert. You’ll need only the right tools and replace window pane a few minutes of your time.


If your single-pane windows are old broken, deteriorating or damaged, replacing them with newer glass that is tempered or insulated can improve energy efficiency and reduce noise while preserving the historic integrity of older homes. Most homeowners with basic hand tools can Replace window Pane the window pane. You will also require an additional window pane, glazier’s tips, pliers, and latex glazing putty. If you need to you may make use of a heat gun to warm the old putty. Wear safety glasses and gloves before you begin. Working with broken glass can cause serious injuries.

Take out any broken glass pieces remaining. This is best done using a pair of pliers, however, a flathead screwdriver may work in the pinch. Utilize a wood chisel or putty knife to get rid of any old putty that remains around the frame and window sash. Be careful to not break the window sash. Be careful and slow. This should be done on an elevated ladder, not on the ground. Also, ensure that someone lower to keep it in place.

Once you have removed all of the old putty, prepare the window frame for the new pane. Find the width and the height of the opening for the sash by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Bring these measurements to an hardware store or home center and have a piece of stock glass cut to size. You can cut the glass yourself if you possess the appropriate tools.

After installing the glass Apply a small amount of caulking around the edge. This will make the glass weatherproof. Then, place a glazier’s tip on each side of the frame to secure the pane into its place. The points should not be so tight as to cause friction between the sash and frame, but they also shouldn’t be too loose.

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

Glazier’s Points

The glazier’s points are the tiny triangular pieces of steel that allow glass to be secured into a window frame without scratching or damaging the fragile surface. It’s simple to learn how to use this nefarious tool, and you’ll save money on the cost of a professional installation.

Once the old putty and glazier’s points are removed, thoroughly clean the frame with a utility knife to eliminate any remaining residue. If necessary you can lightly sand the wood along the rabbet grooves to smooth out rough areas. If you sand wood protect it with painter’s tape to avoid accidental damage.

Note down the dimensions of the frame. These measurements can be brought to a home center or hardware store and the new pane will be cut to a smaller size. This will ensure a tight fit, and allow for expansion and contraction.

Place the new pane into the frame and push it in place using your hand. Then, you can use the point of your chisel, or the back of the putty knife to make a tap on the glazier’s facets, as illustrated in Figure 11. When you’re done, they should be level with the top edge of the pane, and the shoulders that are raised of the points should be below the rabbet’s lip. groove.

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

Install the new window sash after the glazing compound has dried. First, you need to coat the wood with a thick layer of linseed. This will stop the new putty from drying out and cracking as it absorbs moisture. 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 point into the rabbet grooves. Repeat this process in intervals of 10 inches all around the frame.


A baseball thrown at you or a rock that is errant or a falling branch can cause a window to break or crack. Most windows can be replaced by putting in a new piece. The glass is held in place with a small metal clip called a glazier’s point, and putty, which is often called glazing compound. Before installing a replacement pane, first remove the old one and clean up the area with the help of a rag, an abrasive scraper that is a pull type or an abrasive wood chisel. Wear protective glasses and gloves while doing this work. You’ll need a heating gun if the window is glued to the frame.

If you’re planning to reinstall your original sash, remove the molding that holds the old pane. Sand the sash until it is flat and ready to receive new caulk. Once the sash is put back in place, you can apply a silicone caulk over the glass. This will ensure that it doesn’t leak over time or discolor.

Take the glazing points out of the rabbets, the grooves in the sash that the glass sits. If they’re difficult to chisel, use an instrument such as a heating gun over them to soften first. When using a heat tool, be careful to not scratch the sash and its railings.

Create the bed for your new pane by removing the old glaze points and putty. Roll a rope with glazing compound between your fingers, and make it around 1/2 inch thick. Press it into the rabbets, where the glass will be placed. It is essential that the glass rests against the putty in all places on each side So if you have to, lightly tap the glass into the rabbet using your thumb.

If the new pane has a crack you can fill it with a solvent-based glass glue or silicone caulk prior pressing it into the sash. If the crack isn’t sealed, you’ll need to use putty to keep water from getting in. After the putty has dried remove the oily film from the glass and let it dry completely before you paint. If you paint before the putty is fully dry, it will not form a solid seal and could be leaking or discoloring in time.


If you’ve had a broken window pane, Replace Window pane you might be worried about the expense of a new one. However, replacing a single glass pane doesn’t require a huge amount of money if you do it yourself. Even a double-paned window can be replaced at a fraction of the cost it would cost a professional.

If you are working on a large-sized window, make sure it is securely fixed to the frame. This job is relatively easy and fast with the proper tools and techniques.

If you’re ready to begin taking off the old window by removing the glazing points made of metal that are attached to it. These are tiny metal triangles that act as “nails” to hold the window in place. They are submerged beneath a bead or glazing putty that hardens to solid wedge that holds the wood frame in place and hides the points.

After removing the old pane, clean the frame and the wood. Scrape away any old paint and sand down the rabbet grooves, where the glazing points used to be. They should be sanded to bare wood so that you can paint them the same shade as the rest of the frame. After sanding the wood, apply a layer of flax oil. This will help to extend its life.

The next step is to determine the size of the window pane replacement‘s opening. It is necessary to measure the horizontal and vertical dimensions of the entire opening as well as the thickness. Subtract 1/8 inch from each measurement to ensure you get a precise size for the new pane. This will allow for seasonal changes in the glass. You can bring these measurements to a hardware or home improvement shop 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.

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