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How to Replace Window Panes

A damaged or cracked window can be a nuisance. This can be an opportunity to upgrade to energy-efficient windows or insulated ones, and reap benefits such as improved comfort, increased resale value and lower utility costs.

You can do it yourself at less than what it would cost to employ an expert. You only need the proper tools and a few minutes of your time.

Glass

If your single-pane windows glasses replacement are outdated broken, deteriorating or damaged replacing them with modern insulated or tempered glass can increase energy efficiency and reduce noise while maintaining the historical integrity of older homes. Most homeowners with basic hand tools can replace a window pane. In addition to a new pane, the following components are required for the replacement glass in windows process: latex glazing putty Glazier's points; pliers and a heat gun for warming the old putty, if needed. Wear safety goggles and gloves prior to beginning. Working with broken glass could cause serious injuries.

Take out any broken glass pieces remaining. This is best done using pliers, though using a flathead screwdriver may work in a pinch. Use a wood chisel, or putty knives, to take away any old putty that remains around the frame and window sash. Be careful not to damage the window sash. Work slowly and carefully. It is recommended to work using a sturdy ladder rather than the ground and have someone stand below the sash to help keep it in place.

Once you have removed all the old putty, prepare the window frame to fit the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of width and height. These measurements can be taken to a hardware or home center store to have cut a piece of glass that is in stock to the correct size. Alternatively, you can cut the glass yourself, if you have the appropriate tools.

After putting in the new glass, apply caulking around the edge. This will make the glass weatherproof. Install a glazier's pointing on both sides of the frame. This will help secure the pane. The points shouldn't be too tight that they cause friction between the sash and frame however they shouldn't be too loose.

Before applying the putty to the surface, gently knead it until it is smooth and free of lumps. Roll it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from corner to corner, making sure it is even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces of metal that allow glass to be secured into frames for replacement windows glass without scratching or damaging the delicate surface. Understanding how to use these hidden tiny pieces of help is simple and could save you money on a professional installation or the cost of a window replacement of purchasing new glass.

Once the old putty and the glazier's point are gone, thoroughly clean the frame using a utility knife to get rid of any remaining residue. If needed, lightly sand the wood along grooves of the rabbet to smooth out rough spots. If you do sand the wood, be sure to protect it by using painter's tape to prevent accidental damage.

Take the dimensions of the frame and write down accurate measurements. These measurements can be brought to the hardware or home center store, and the new frame will be cut slightly smaller. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Insert the new pane into the frame and push it in using your hands. Then, you can use the point of your chisel or the back end of the putty knife to pierce the glazier's points, as illustrated in Figure 11. When you're done taping, they should be flush with the top edge of the pane, and the shoulders of the points should be just below the rabbet's rim groove.

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

Install the new window sash when the glazing compound has dried. First, saturate the wood with a heavy coat of Linseed oil. This will prevent the new putty from soaking in the moisture and deteriorating and cracking over time. Apply the coating using a brush this coat, or the point 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 at intervals of 10 inches around the frame.

Putty

A baseball that is thrown or an unintentional rock, or a fallen branch can cause a window to crack or break. Most windows can be replaced by installing a new piece. The glass is held in place by a small metal clip called the glazier's pointed and putty, also called glazing compound. Remove the old pane and clean the area with the rag, a pull-type scraper, or a wood chisel. Wear gloves and safety glasses while working. You'll need a heat gun in the event that the window is glued into the frame.

If you're planning to install the original sash in the future, take care to remove any pieces of molding that hold the old pane in place. Then sand the sash to ensure it's smooth and ready for new caulk. Once the sash is re-installed then, apply a new silicone caulk around the glass to ensure that it doesn't swell or fade over time.

Remove the glazing points from the rabbets, or the grooves in the sash where the glass is. If they're hard to chisel, use the hand tool, such as a heatgun over them to soften first. If you're using a heating gun, be cautious not to cause damage to the sash or its railings by using the tool too tightly.

Prepare a bed for your new pane after you have removed the old putty and glazing points. Roll a rope made 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 be. It is crucial that the glass rests against the putty on each side, so if you need to, lightly tap the glass into the rabbet with your thumb.

If the new pane is cracked then you can seal 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 the water out. After the putty has dried, clean the oily film off the glass with the help of a rag. Allow it to dry completely before painting. If you paint before the putty is completely dry, it won't create a solid seal and could be leaking or discoloring over time.

Paint

You might be worried about replacing a damaged piece of glass. But the truth is that replacing one glass pane does not need to cost a fortune if you do it yourself. Even a double-paned window could be replaced for a fraction of the price it costs for a professional.

First, if you're working on a large-sized window, ensure that it is securely attached to the frame. Using the proper tools and techniques, you can make this task relatively easy and quick.

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

After taking off 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 color as the rest the frame. After the sanding process, apply a coat of flax oil on the wood that is not sanded down to extend the life of the frame.

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