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How to Replace Window Panes

A damaged window pane could be a nuisance. This could be an opportunity to upgrade to energy-efficient windows or insulated ones to enjoy benefits like increased comfort, increased resale value and lower utility costs.

This is a project you could take on yourself for a fraction of the cost of hiring a professional. You'll need only the appropriate tools and a few hours of your time.

Glass

Replace your old single-paned windows with tempered or insulate glass to improve the efficiency of your energy, reduce noise, and protect the original character of your old home. The majority of homeowners with basic hand tools can Replace Window Pane a window pane. In addition to a new pane, the following tools are needed for the replacement process: latex glazing putty pliers, glazier's points and a heat gun for warming the old putty, if needed. Wear safety goggles and gloves prior to starting. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. This is best accomplished with a pair of pliers, however, a flathead screwdriver can also be effective in a pinch. After that, use a wood chisel or putty knife remove the remaining old putty from around the frame and sash. Work slowly and carefully making sure not to break the current window sash. This should be done on a ladder, not the ground. Also, you should have someone below the sash hold it steady.

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

After installing the glass After installing the glass, apply caulking to the edge. This will make the glass weatherproof. Then install a glazier's point on each side of the frame to hold the pane in place. The points shouldn't be so tight as to cause friction between the frame and sash, but they also shouldn't be loose.

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

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. It's easy to understand how to use this nefarious tool, and you'll be able to save money on the expense of a professional installation.

After taking off the old putty, glazier points and any remnants Clean the frame thoroughly with an utility knife. Lightly sand the wood into the rabbet grooves if needed to smooth rough areas. If you sand wood protect it with painter's tape to prevent accidental damage.

Measure the empty frame's dimensions and note down precise measurements. These measurements can be taken to a home center or hardware store, and the new frame will be cut a bit smaller. This will ensure a tight fit, and allow for replace window pane expansion and contraction.

Place the new pane in the frame and push it in with 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. The glazier's point should be flush against the top edge of the pane and the shoulders raised should be just below the lip.

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

After the glazing compound dries, you're ready to install the new window sash. The first step is to coat the wood with a thick layer of linseed. This will prevent the newly-created putty from drying out or cracking due to the moisture it absorbs. Apply this coat using a brush or the edge of your putty knife, then use the chisel, or the back end from the putty knife to gently hammer in the new sash and glazier's point into the grooves of the rabbet. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball thrown at you or an unintentional rock, or falling branch could cause a window to crack or break. Fortunately, windows can be easily replaced by simply putting a brand new piece of glass in its the proper place. The glass is held into position by a small metal clip, referred to as a glazier's point and putty. This compound is also called glazing compound. Remove the old pane and clean the area with the rag, a pull-type scraper or wood chisel. Wear safety glasses and gloves while working. You'll require a heat gun if the window is glued into the frame.

If you're planning to install the original sash in the future, take care to remove the molding pieces that secure the old pane. Sand the sash until it's flat and ready to receive new caulk. After the sash has been put back in place then, you can apply a silicone caulk to the glass. This will ensure that it won't get soiled or discolor over time.

Take the glazing points out of the rabbets and the grooves in the sash that the glass is. If they're difficult to cut out, try holding the hand tool, such as a heat gun over them to soften them before you do. If you're using a heating gun, be cautious not to cause damage to the railings of the sash or the sash window replacement itself by using the tool too close.

After the old glaze points and putty are removed, make a bed for the new pane. Roll a rope of glazing compound between your fingers, and make it about 1/2 inch thick. Place it into the rabbets, where the glass will be put. It is essential that the glass is positioned against the putty in all places on each side, so if you need to, lightly tap the glass into the rabbet with your thumb.

If the new pane has a crack, you can cover it with a solvent-based glass glue or silicone caulk before pressing it into the sash. In other cases, you'll need to putty over the crack to form a tight seal and keep water out. Once the putty is dry, wipe the oily film from the glass and allow it to dry completely before you paint. If you paint before the putty is completely dry, it won't form a solid seal and could be leaking or discoloring in time.

Paint

You may be concerned about replacing a broken pane of glass. In reality, replacing a single piece of glass doesn't have to be expensive if you do it on your own. Even a double-paned window can be replaced for a fraction of the price it costs an expert.

If you are working with large glass windows, first make sure it is securely fixed to the frame. Using the proper tools and techniques, you can make this task relatively easy and fast.

If you're ready to begin taking off the old window by removing the glazing points made of metal that are connected to it. These are tiny metal triangles that act as "nails", holding the window in the frame. They are submerged beneath a bead or glazing putty that sets to form an unbreakable wedge that holds the frame securely in place and conceals the edges.

After you have removed the old pane taken away clean the surrounding frame and wood. Scrape away any paint and sand down the rabbet grooves, where the glazing points were. Sand them down to bare wooden surfaces, allowing you to paint the frames the same shade. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

Then, take measurements of the dimensions of the window's opening. It is necessary 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 that you get the exact measurement for the new pane. This will also allow for expansion and contraction of the glass during seasonal change. You can bring these measurements to a hardware store 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 Replace Window pane as the frame to prevent water and air from leaking into the frame and causing fogging.