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How to Replace Window Panes

A damaged or cracked window is an issue. This can be an opportunity to upgrade your windows to energy efficient or insulated ones to enjoy benefits such as improved comfort, increased resale values and reduced utility costs.

You can do it yourself for a less than what it would cost to hire an expert. You'll only require the appropriate tools and a few hours of your time.

Glass

If your single-pane windows are old, deteriorating or broken replacing them with modern glass that is tempered or insulated will increase energy efficiency and reduce noise while maintaining the historical integrity of older homes. The replacement of a window pane is relatively easy and can be accomplished by most homeowners who possess basic hand tools. You'll also require a replacement window pane, glazier's tips, pliers, and latex glaze putty. If you need to you can use a heatgun to warm the old putty. Before starting, wear protective gloves and goggles since working with broken glass may cause injuries.

Remove any broken glass pieces remaining. It is best to use pliers however a flathead could be useful equally. After that, use a wood chisel, or putty knife, to remove the rest of the old putty from around the frame and the sash. Be careful not to scratch the window sash. Take your time and work slowly. It is best to do this on a sturdy ladder rather than on the ground, and to have someone stand below the sash in order to help hold it steady.

After you have removed all the old putty, you can prepare the window frame for the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. Bring these measurements to a hardware store or home center and have a piece of stock glass cut to size. Alternately, you can cut the glass yourself, if you have the appropriate tools.

After installing 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 as to cause friction between the sash and the frame however they shouldn't be loose.

Before applying the putty, work it in a gentle manner until it's soft and free of lumps. Cut it into pencil-sized pieces. Apply the first strip 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 small triangular pieces of steel which help to secure the glass into the window and door replacement frame without causing damage to the delicate surface. It's easy to understand how to use this secret tool and you can save money on the expense of an expert installation.

After removing the old putty, glazier points and any leftovers clean the frame thoroughly using a utility knife. Lightly sand the frame in the rabbet grooves, if necessary, to smooth rough areas. If you sand wood protect it with painter’s tape to avoid accidental damage.

Take measurements of the empty frame and record precise measurements. These measurements can be taken to an hardware or home centers store and the new pane will be cut a bit smaller. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new pane in the frame and press it down with your hands. Use the point of the chisel or the back of the putty blade to tap the glazier's points as illustrated in Figure 11. When you're done, they should be level with the top edge of the pane. the shoulders of the points should be below the rabbet's lip. groove.

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

Once the glazing compound has dried, you're ready to install the new window sash. The first step is to coat the wood with a thick coat of Linseed oil. This will stop the new putty from sucking up moisture and deteriorating and cracking over time. Apply the coat using a brush or the edge of your putty knife, and then use the chisel, or the back end from the putty knife to gently hammer the new sash and glazier's points into the rabbet grooves. Repeat this procedure every 10 inches around the frame's perimeter.

Putty

A baseball that is thrown, an errant rock or a fallen branch can cause a window pane to crack or break. Fortunately, windows can be repaired by simply placing a new piece of glass replacement for window in its the right place. The glass is held into the position with a tiny metal clip, also known as a glazier’s point and putty. This compound is also known as glazing compound. Remove the old pane and clean the area with the rag, a pull-type scraper, or a wood chisel. Wear safety glasses and gloves when you work. You'll need a heat gun if the window screen replacement is glued into the frame.

If you're planning to reinstall your original sash, remove the molding that holds the old pane. Then you can sand the sash down to ensure it's smooth and ready for new caulk. After the sash has been put back in place it is possible to apply a silicone caulk on the glass. This will ensure that it won't get soiled or discolor over time.

Remove the glazing points from the rabbets, or the grooves in the sash that the glass is. If they're difficult to cut, place a hand tool such as a heating gun over them for a few minutes to soften them. When using a heat tool, be sure to not damage the sash and its railings.

Prepare the bed for your new pane by removing the old glaze and putty. Roll a piece of glazing compound between your hands, shaping it to be around 1/2-inch thick. Then, press it into the rabbets where the glass will rest. It is essential that the glass sits on the putty in all places on each side If you have to tap it, gently press 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. Otherwise, you'll need to apply putty on the crack to create an airtight seal and keep water out. After the putty is dry and the film is oily, wipe it off the glass with a rag and allow it to dry completely prior to painting. Paint after the putty is completely dry. It won't form a good seal and may be leaking or discoloring over time.

Paint

If you've experienced a broken window pane, then you may be concerned about the expense of a new one. However, replacing a single glass pane doesn't have to break the bank if you do it yourself. In fact, even a double-pane window can be replaced for less than the cost of an expert.

If you're working with a large glass window first, ensure that it is securely fixed to the frame. This job can be made relatively simple and quick with the right tools and techniques.

If you're ready to begin taking off the old window pane by removing the glazing points of metal that are connected to it. These are essentially small metal triangles which function as "nails" which hold the window in within the frame of wood. They are submerged beneath a bead or glazing putty which hardens into a solid wedge that holds the wood frame in place and hides the points.

After removing the old pane, clean the 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 so you can paint the frames with the same color. After the sanding process, apply a coat of flax oil on the wood that is not sanded down to prolong its life.

Next, measure the width of the window opening. You'll need to determine 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 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.