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How to Replace Window Panes

A cracked window pane is an issue. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows, and benefit from improved comfort, increased potential for resales, and less bills.

You can do it yourself at a fraction of what it would cost to employ an expert. You'll only require the right tools and a few hours of your time.

Glass

If your single pane windows are old, deteriorating or broken, replacing them with newer glass that is tempered or insulated can increase energy efficiency and reduce noise while maintaining the original character of older homes. The process of replacing the window pane is simple and can be done by homeowners with basic hand tools. Alongside a replacement window pane pane, the following tools are required: latex glazing putty; glazier's points; pliers; and an electric heater to warm the old putty, if necessary. Wear safety goggles and gloves prior to beginning. Working with broken glass could result in serious injuries.

Remove any broken glass pieces remaining. This is best accomplished with a pair of pliers, but a flathead screwdriver may be effective in the pinch. After that, use a wood chisel, or putty knife, to take the remainder of the old putty from around the frame and the sash. Be careful to not break the window sash. Work slowly and carefully. This should be done on an elevated ladder, not on the ground. Also, ensure that someone lower to keep it in place.

Make sure that the window frame is ready to accept the new pane once you have removed the old glue. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. Take these measurements to an hardware store or home center, and get a piece of stock glass cut to size. You can also cut the glass by yourself if you possess the appropriate tools.

After putting in the new pane, run a small bead of caulking along the edge to seal it against weather. Then, you can install a glazier's pointing on each side of the frame to hold the pane in the right place. The points should not be so tight that they cause friction between the sash and the frame however they shouldn't be too loose.

Before putting the putty on, work it in a gentle manner until it's soft and free of lumps. Cut it into pencil-sized pieces. Apply the first strip in the corner of the frame, working from one corner to the next so that it is even and smooth.

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 any damage to the fragile surface. It's easy to learn how to use this hidden tool, and you'll save money on the cost of a professional installation.

After removing the old putty, glazier points, and any other remnants Clean the frame thoroughly using a utility knife. Lightly sand the wood in the rabbet grooves, if necessary, to smooth out rough areas. If you decide to sand the wood, ensure you protect it with painter's tack to avoid accidental damage.

Note down the exact dimensions of the frame. These dimensions can be taken to the hardware or home center 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 into the frame and press it down with your hands. Then, you can use the point of your chisel or the back of the putty knife to tap in the glazier's facets, as illustrated in Figure 11. The glazier's points should be flush against the top edge of your pane and the shoulders raised should be just below that lip.

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

When the glazing compound is dry it's time to put in the new window sash. The first step is to coat the wood with a thick coat of Linseed oil. This will prevent the newly-created putty from drying out and cracking as it absorbs moisture. Apply the coat using a brush or the tip of your putty knife, then employ the chisel or back end of the knife to gently hammer the new sash and glazier's point into the grooves of the rabbet. Repeat this procedure every 10 inches along the frame's perimeter.

Putty

A baseball thrown, a rock thrown in error, or a fallen tree can cause a broken or cracked Window Cost Replacement pane. Fortunately, the majority of windows can be replaced by simply putting a brand new piece in the right place. The glass is held in place by a small metal clip, called the glazier's point, and putty. This compound is also called glazing compound. Before installing a new pane, first remove the old one and clean up the area using the help of a rag, a pull-type paint scraper or the wood chisel. Wear safety glasses and gloves when working. You'll require a heat gun in the event that the window is glued into the frame.

If you are planning to install your original sash, remove the mold that holds the old pane. Sand the sash until it is flat and ready to receive new caulk. After the sash has been reinstalled then, you can apply a silicone caulk on the glass. This will ensure that it won't get soiled or discolor over time.

Remove the glazing points in the rabbets. These are the grooves on the sash where the glass is. If they are hard to chisel, hold the hand tool, such as a heating gun over them for a few minutes to soften them. If you're using a heated gun, make sure not to cause damage to the railings or sash by using the tool too tightly.

After the old points of glazing and putty are removed, prepare a bed for the new pane. Roll a rope with glazing compound between your fingers and then make it about 1/2 inch thick. Place it into the rabbets where the glass will be put. The glass must be positioned against the putty on both sides. If you need to, lightly tap your glass into the rabbet with your thumb.

If the new pane has a crack you can fill it with a solvent-based glue or silicone caulk before 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 remove the oily film off of the glass and allow it to dry completely before painting. Paint after the putty has completely dried. It won't form a good seal and may discolor or leak over time.

Paint

If you've had a broken window pane, then you may be worried about the expense of a new one. The truth is, replacing a single pane glass doesn't need to be costly when you do it on your own. In fact even windows with double panes can be replaced for only a fraction of the cost of a professional.

If you're working with a large glass window, first make sure it is securely fixed to the frame. Using the proper tools and techniques you can complete this task easily and fast.

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 that act as "nails" that hold the window in the frame. They are submerged beneath a layer of glazing putty that hardens into a solid, moulded wedge that secures the window in place and conceals the edges.

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

Next, measure the size of the window's opening. You'll need to take vertical and horizontal measurements of the entire opening and also the thickness of the old pane. To determine the exact size of the new pane, subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass. You can bring these measurements to a hardware 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.