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How to Replace Window Panes

A damaged or cracked window can be a source of frustration. This could be an opportunity to upgrade your windows to energy efficient or insulated ones and enjoy benefits like increased comfort, increased resale value and lower utility costs.

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

Glass

If your single-pane windows are old damaged, cracked or deteriorating replacing them with modern glass that is tempered or insulated will increase energy efficiency and reduce noise while also preserving the historic integrity of older homes. The procedure of replacing the window pane is easy and can be accomplished by anyone with basic hand tools. In addition to a new pane, the following items are required such as latex glazing putty; glazier's points; pliers; and a heat gun for warming the old putty, if necessary. Wear safety glasses and gloves prior to beginning. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers for this however, a flathead may be useful equally. Use a wood chisel, or putty knives to remove any old putty remaining around the frame and the window sash. Be careful not to break the window sash. Be careful and slow. This should be done on a ladder, not on the ground. Also, have someone below the sash hold it steady.

Prepare the window frame to accept the new pane once you have removed the old glue. Find the width and the height of the opening for the sash, subtracting 1/8 inch from each measurement (to allow replacement handles for windows seasonal expansion and contraction). Take these measurements to an hardware store or home center, and find a piece glass cut to size. You can cut the glass yourself if you possess the right tools.

After installing the glass, apply a small amount of caulking to the edge. This will make the glass weatherproof. Then install a glazier's point on each side of the frame to secure the pane into its place. The points should not be so tight that they create friction between the sash and frame but they shouldn't be loose.

Before applying the putty, knead it thoroughly until it is soft and free of lumps. Cut it into pencil-sized pieces. Place the first strip to the corner of the frame, working from one corner to the next so that it is smooth and even.

Glazier's Points

The glazier's points are the small triangular pieces of metal that help secure glass into the frame of a window without damaging or scratching the delicate surface. Knowing how to use these tiny pieces of help is simple and could save you money on professional installation or the cost of new glass.

After getting rid of the old putty glazier points, and any other remnants clean the frame thoroughly with an utility knife. Lightly sand the wood into the rabbet grooves, if necessary, to smooth rough areas. If you decide to sand the wood, make sure to protect it with painter's tack to avoid accidental damage.

Measure the empty frame's dimensions and record precise measurements. These measurements can be brought to a home center or hardware store, and the new pane will be cut to a smaller size. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Place the new window in the frame and press it into the frame by using your hands. Then, you can use the point of your chisel or back of the putty knife to tap in the glazier's points as shown in Figure 11. When you're done taping, they should be level with the top edge of the pane, and the shoulders of the points should be just below the rabbet's lip. groove.

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

Install the new window sash once the glazing compound has dried. The first step is to coat the wood with a thick coat of Linseed oil. This will prevent the new putty from soaking up the moisture and deteriorating and cracking over time. Apply the coating using a brush this coat, or the tip of the blade. Then use the chisel on the back of the tool or the back of the putty handle to gently hit the new sash, or glazier's point into the grooves of the rabbet. Repeat this process at intervals of 10 inches all around the frame.

Putty

A baseball that is thrown, an errant rock or Windowpane Replacement falling branch could cause a window to crack or break. Fortunately, the majority of 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 small clips made of metal called the glazier's pointed and putty, which is often called glazing compound. Remove the old pane and clean the area with a rag, a pull-type scraper, or a wood chisel. Wear gloves and safety glasses when you work. If the window is secured to the frame, you'll need use a heat gun to soften the adhesive prior to prying it free.

If you plan to reinstall the original sash in the future, take care to remove any pieces of molding that secure the old pane. Then sand the sash to ensure it's level and ready for a new caulk. After the sash has been re-installed then, apply a new silicone caulk around the glass to ensure it will not leak or change color over time.

Take the glazing points out of the rabbets, the grooves in the sash, where the glass is. If they're hard to chisel out, try holding an instrument like a heat gun over them to soften them up first. If you're using a heated gun, be cautious not to cause damage to the railings or sash by using the tool too closely.

Prepare a bed for your new pane by removing the old putty and glazing points. Roll a rope of glazing compound between your hands, and form it into a 1/2-inch thick. Place it into the rabbets where the glass will be put. It is essential that the glass rests against the putty on both sides If you have to do so, gently tap the glass into the rabbet with your thumb.

If the new pane is cracked, you can cover it with a solvent-based glue or silicone caulk before pressing it into the sash. In other cases, you'll need to apply putty over the crack to form a tight seal and keep water out. After the putty is dry, clean the oily film off the glass using the help of a rag. Allow it to dry completely before painting. If you paint before the putty has completely dry, it won't create a solid seal and could discolor or leak over time.

Paint

If you've experienced a broken window pane, you might be worried about the cost of a new one. However, replacing a single glass pane doesn't have to break the bank If you can do it yourself. Even a double glazed windows replacement-paned window could be replaced for a fraction of the price it costs a professional.

If you're working with large glass windows first ensure it is securely attached to the frame. This is relatively easy and quick with the proper tools and techniques.

When you're ready to start with the removal of the old window pane by prying out the glazing points made of metal that are attached to it. These are tiny metal triangles that function as "nails", holding the window in place. They are placed under a bead of glazing putty that hardens into a solid, molded wedge that holds the window firmly in place and conceals the edges.

Once you have the old pane removed Clean up the frame and wood. Scrape off any old paint, and sand the rabbet grooves that the glazing points were placed. Sand them down to bare wooden surfaces, allowing you to paint the frames with the same shade. After sanding the wood then apply a layer of flax oil. This will help to extend its life.

The next step is to determine the width of the window's opening. You will need to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. To get the exact size of the new pane, subtract 1/8 inch from both measurements. This will also allow for expansion and contraction of the glass in times of seasonal changes. You can take these measurements to a hardware or home improvement store 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.