How to Replace Window Pane Window Panes

A damaged window pane can be a nuisance. This can be an opportunity to upgrade to energy-efficient windows or insulated ones and enjoy advantages like improved comfort, increased resale values 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’ll need only the appropriate tools and a few hours of your time.


If your single-pane windows are old damaged, cracked or deteriorating, replacing them with newer insulated or tempered glass can increase energy efficiency and decrease noise while maintaining the historic integrity of older homes. The process of replacing a window pane is relatively easy and can be accomplished by most homeowners who possess basic hand tools. You will also need an extra window pane, glazier’s tips pliers, and latex glaze putty. If necessary you may use a heatgun to warm the old putty. Before beginning, wear gloves and safety glasses as working with broken glass could cause injuries.

Begin by removing any broken pieces of glass. This is best accomplished with a pair of pliers, though using a flathead screwdriver may work in a pinch. Utilize a wood chisel or putty knives to remove any old putty that remains around the frame and the window seal replacement sash. Take your time and work slowly and be careful not to damage the old replacement window glass near me sash. This should be done on a ladder, not the ground. Also, you should have someone lower to hold it steady.

Once you have removed all the old putty, it is time to prepare the window frame for the new pane. To allow for seasonal expansion or contraction by subtracting 1/8 inch from the measurements of width and height. These measurements can be taken to an hardware or home centers store to have cut a piece of stock glass to the right size. Alternatively, you can cut the glass yourself if you have the right tools.

After installing the new pane After installing the new pane, apply a small amount of caulking along the edge to ensure it is weatherproof. Then, place a glazier’s tip on the frame’s opposite side to secure the pane into its place. The points should not be so tight as to cause friction between the frame and sash but they should not be too loose.

Before applying the putty on the surface, knead thoroughly until it is soft and free from lumps. Roll it into pencil-sized strips. The first strip should be placed to the corner of the frame, moving from one corner to another to ensure it is even and smooth.

Glazier’s Points

The glazier’s facets are tiny triangular pieces of steel that help secure glass into frames for windows without scratching or damaging the fragile surface. It’s easy to learn how to use this nefarious tool, and you’ll be able to save money on the expense of an expert installation.

After removing the old putty, glazier points and any leftovers, clean the frame thoroughly with an utility knife. If necessary, lightly sand the wood along grooves of the rabbet to smooth out rough spots. If you decide to sand the wood, ensure you protect it with painter’s tape to avoid accidental damage.

Note down the exact dimensions of the frame. These measurements can be taken to an hardware or home centers store, and the new frame will be cut a bit smaller. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Place the new pane in the frame and press it in place by using your hands. Then, use the tip of your chisel, or the back end of the putty knife to pierce the glazier’s points as shown in Figure 11. After you’re done, the points should be in line with the top edge of the pane, and the shoulders of the points should be below the rabbet’s rim groove.

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

After the glazing compound dries, you’re ready to install the new window sash. First, you need to coat the wood with a thick layer of linseed. This will keep the new putty from sucking in the moisture and deteriorating and cracking over time. Apply the coating using a brush this coat, or even the tip of the putty blade. Then use the chisel on the back of the tool or the back of the putty handle to gently hammer the new sash or glazier’s tip into the rabbet grooves. Repeat this process every 10 inches around the frame’s perimeter.


A baseball thrown or a rock thrown by error, or a tree falling can cause a broken or cracked window pane. Fortunately, windows can be repaired by simply putting a brand new piece of glass in its the right place. The glass is held in place by a small metal clip, called a glazier’s point and putty. This compound is also called glazing compound. Remove the old pane and clean the area with an abrasive, replace window pane pull-type scraper or wood chisel. Wear safety glasses and gloves when you work. If the window is secured to the frame, you’ll have to make use of a heat gun to soften the adhesive prior to cutting it loose.

If you’re planning to install the original sash in the future, take care to remove the molding pieces that hold the old pane in place. Sand the sash until it is flat and ready for new caulk. Once the sash is re-installed, apply a new silicone caulk around the glass to ensure it will not leak or change color over time.

Remove the glazing points from the rabbets. These are the grooves on the sash, which is where the glass is located. If they’re hard to cut, place a hand tool such as a heatgun over them for a few minutes to soften them. When using a heating tool, make sure to not scratch the sash and its railings.

Once the old points of glazing and putty have been removed make a bed replacement handles for windows the new pane. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Press it into the rabbets, where the glass will be placed. The glass should rest against the putty on both sides. If necessary, lightly tap your 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 before pressing it into the sash. If not, you’ll have to apply putty over the crack to create an airtight seal and keep water out. After the putty has dried clean the oily film off the glass and allow it to dry completely before you paint. If you paint before the putty is completely dry, it won’t create an effective seal and could leak or discolor over time.


You might be worried about replacing a broken pane of glass. However, replacing a single glass pane doesn’t need to cost a fortune If you can do it yourself. In fact even windows with double panes can be replaced for less than the cost of a professional.

If you’re working with large glass windows first ensure it is securely fixed to the frame. By using the correct tools and techniques, you can complete this task easily and fast.

Once you’re ready to begin with the removal of the old window by removing the metal glazing points that are connected to it. These are tiny metal triangles that act as “nails” that hold the window within the frame. They are buried beneath a glaze putty or bead that sets to form an unbreakable wedge that holds the wood frame in place and hides the points.

After you have removed the old pane taken away Clean up the frame and wood. Scrape off any paint that has been used and sand down the rabbet grooves that the glazing points were. Sand them down to clean wooden surfaces so you can paint the frames the same shade. After sanding, apply a layer of flax oil on the bare wood to extend the life of the frame.

The next step is to measure the dimensions of the window’s opening. You’ll need to determine the vertical and horizontal dimensions of the entire opening as well as the thickness. To determine the exact size of the new pane, subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass. Bring these measurements to your local hardware or home improvement store and have cut the glass for you.

Now, it’s time to bed the new window pane replacement 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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