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How to Replace Window Panes

A damaged window pane can be an issue. It could also be a chance to upgrade your glass to energy-efficient or insulated windows and reap benefits like improved comfort, increased resale value and reduced utility bills.

It's a task you can tackle yourself at less than the cost of hiring a professional. It requires the right tools and an hour or two of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged replacing them with more modern glass that is tempered or insulated can increase energy efficiency and decrease noise while preserving the historic integrity of older homes. Most homeowners with basic hand tools can replace windows with ease. You will also require an extra window pane, glazier's suggestions, pliers, and latex glaze putty. If you need to you can use a heating gun to warm the old putty. Wear safety goggles and gloves prior to beginning. Working with broken glass could result in serious injuries.

Remove any broken glass pieces that remain. This is best accomplished with a pair of pliers, but a flathead screwdriver can also be used in a pinch. Then, use a wooden chisel or putty knife to take the remainder of the old putty from the frame and sash. Be careful and slow, taking care not to damage the old window sash. It is best to work on a stable ladder rather than on the ground and have someone standing below the sash in order to help hold it in place.

After you have removed all the old putty, it is time to prepare the window frame to accommodate the new pane. To allow for seasonal expansion or contraction by subtracting 1/8 inch from the measurements of the width and height. Bring these measurements to the nearest hardware store or home center, and find a piece glass cut to size. You can cut the glass yourself if you have the appropriate tools.

After installing the new glass After installing the glass, apply caulking to the edge. This will make the glass weatherproof. Install a glazier's pointing on both sides of the frame. This will secure the pane. The points shouldn't be so tight that they create friction between the frame and the sash However, they should not be loose.

Before applying the putty to the surface, knead thoroughly until it is soft and free of lumps. Then you can roll it into pencil-sized strips. Place the first strip to the corner of the frame, moving from one corner to another so that it is smooth and even.

Glazier's Points

The glazier's points are small triangular pieces of steel which help to secure the glass into the window frame without damaging the delicate surface. It's simple to learn how to use this secret tool, and you'll save money on the cost of an installation by a professional.

After taking off the old putty, glazier points and any residue Clean the frame thoroughly using a utility knife. If needed, lightly sand the wood along rabbet grooves to smooth rough spots. If you do sand the wood, make sure to protect it with painter's tape to avoid accidental damage.

Write down the dimensions of the frame. Take these measurements to a hardware store or home center and have the new pane cut slightly smaller than the frame's opening. This will ensure a secure fit, and allow for expansion and contraction.

Place the new pane in the frame and push it into place firmly with your hand. Then use the point of your chisel, or the back end of the putty knife to pierce the glazier's facets, as shown in Figure 11. The glazier's points should sit flush against the top edge of your pane and the raised shoulders should be just below the lip.

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

After the glazing compound dries it's time to put in the new window sash. First, saturate the wood with a heavy coat of Linseed oil. This will stop the new putty from sucking up the moisture and drying out and cracking with time. Apply the coating using a brush this coat, or the tip of the putty blade. Then, use the chisel that is on the back of the putty tool or the back of the putty handle to gently smash the new sash or glazier's tip into the grooves of the rabbet. Repeat this process at intervals of 10 inches all around the frame.

Putty

A baseball thrown or a rock thrown by error or a branch falling can cause a broken or cracked window. The majority of windows can be repaired easily by putting in a new piece. The glass is held in place by a small metal clip, referred to as the glazier's point, and putty. This compound is also referred to as glazing compound. Before you install a new pane, first get rid of the old one and clean the area with a rag and an abrasive scraper that is a pull type or the wood chisel. Wear gloves and safety glasses when working. You'll need a heating gun when the window is fixed to the frame.

If you are planning to replace Window pane the original sash, remove the molding pieces that hold the old pane in place. Sand the sash until it's flat and ready to receive new caulk. After the sash has been re-installed, apply a new caulk made of silicone around the glass to ensure that it doesn't swell or fade in time.

Remove the glazing points in the rabbets. These are the grooves on the sash, where the glass is located. If they are hard to chisel, use the hand tool, such as a heating gun over them to allow them to soften before. When using a heating tool, be sure to avoid damaging the sash and its railings.

Make the bed for your new pane by removing the old glaze and putty. Roll a rope of glazing compound between your hands, and form it to be around 1/2-inch thick. Place it into the rabbets, where the glass will be placed. The glass must be positioned against the putty on both sides. If necessary, lightly tap your glass into the rabbet with your thumb.

If the new pane is cracked you can fill it with a solvent-based glass glue or silicone caulk prior to pressing it into the sash. If the crack is not sealed, you'll need to use putty to keep water from getting in. Once the putty is dry remove the oily film off of the glass and allow it to dry completely before you paint. Paint after the putty has completely dried. It won't make a strong seal and could be leaking or discoloring over time.

Paint

You may be concerned 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. In fact windows with double panes can be replaced for only a fraction of the cost of a professional.

First, if you are working on a large replacement window glass, make sure it is securely attached to the frame. This job can be done relatively easy and fast using the right tools and techniques.

Once you're ready to begin taking off the old window pane by prying out the glazing points made of metal that are attached to it. These are tiny triangles of metal which act as "nails", holding the window in the frame. They are submerged beneath a glaze putty or bead that sets to form solid wedge that holds the frame firmly in position and conceals the edges.

After you have the old pane taken away, clean up the surrounding frame and wood. Scrape off any paint that has been used, and sand the rabbet grooves in which the glazing points were placed. These should be sanded to bare wood to allow you to paint them the same color as the rest the frame. After sanding the wood then apply a layer of flax oil. This will help extend its life.

The next step is to measure the dimensions of the window opening. You will need 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 have the exact size for the new pane. This will also allow for expansion and contraction of the glass in times of seasonal change. You can take 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 as the frame to prevent water and air from leaking into the frame and causing fogging.