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How to Replace Window Panes

A damaged or cracked window is a nuisance. It could be a chance to upgrade your windows glasses replacement to energy efficient or insulated ones to enjoy benefits such as improved comfort, increased resale values and lower utility costs.

It's a task you can do yourself for a fraction of the cost of hiring an expert. 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 improve energy efficiency and reduce noise while preserving the historic integrity of older homes. A majority of homeowners with hand tools can repair the window pane. You'll also require an additional window pane, glazier's tips, pliers, and latex glaze putty. If you need to you may make use of a heat gun to warm the old putty. Before beginning, wear protective gloves and goggles since working with broken glass may cause injuries.

Take out any broken glass pieces remaining. It is best to use pliers for this however a flathead could be used equally. Then, use a wood chisel, or putty knife, to take the remainder of the old putty from around the frame and sash. Work slowly and carefully making sure not to break the current window sash. It is a good idea to work on a stable ladder instead of the ground, and to have someone stand below the sash to help keep it steady.

Make sure the window frame is ready to receive the new pane when you have removed the old glue. Measure the width and height of the opening for the sash by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Bring these measurements to an 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 glass, apply a small amount of caulking to the edge. This will make the glass weatherproof. Then, you can install a glazier's pointing on each side of the frame to secure the pane in its place. The points shouldn't be too tight that they create friction between the frame and sash but they shouldn't be loose.

Before applying the putty to the surface, knead thoroughly until it becomes soft and free of lumps. Cut it into pencil-sized pieces. Apply the first strip to the corner of the frame, moving from one corner to the other to ensure it is even and smooth.

Glazier's Points

The glazier's facets are tiny triangular pieces of steel which help to secure glass into a window frame without scratching or damaging the delicate surface. It's simple to learn how to use this hidden tool, and you'll be able to save money on the expense of a professional installation.

After the old putty and the glazier's point are gone Clean the frame thoroughly using a utility knife to remove any remaining traces. Lightly sand the wood into the rabbet grooves if needed to smooth out rough areas. If you do sand your wood, ensure you protect it with painter's tape to avoid accidental damage.

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

Place the new window in the frame and push it in place with your hand. Then use the point of your chisel, or the back of the putty knife to make a tap on the glazier's points, as shown in Figure 11. The glazier's points should sit aligned with the top edge of your pane and the shoulders raised should be just below the lip.

Apply a small amount of glazing compound on the edges of the new glass and in the rabbet grooves to seal and protect them. Let it dry completely and cure.

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

Putty

A baseball thrown or a rock thrown in error or a branch falling can result in a cracked or cracked window pane. Most windows can be repaired easily by putting in a new piece. The replacement glass for a window is held in place by small clips made of metal called a glazier's point and putty, which is often called glazing compound. Remove the old pane and clean the area with an abrasive, pull-type scraper, or a wood chisel. Wear gloves and safety glasses while you do this work. You'll need a heat gun in the event that the window is glued into the frame.

If you are planning to replace the original replacement sash windows cost, take off the molding that holds the old pane. Then you can sand the sash down to make sure it's flat and ready for new caulk. Once the sash is re-installed, apply a new silicone caulk around the glass to ensure it doesn't swell or fade over time.

Remove the glazing points from the rabbets. These are the grooves in the sash, where the glass is located. If they're difficult to chisel, hold an instrument such as a heatgun over them for a few minutes to soften them. When using a heat tool, be careful to not damage the sash or its railings.

After the old glaze points and putty have been removed, prepare a bed for the new pane. Roll a piece of glazing compound between your hands, forming it to be about 1/2-inch thick. Press it into the rabbets, where the Glass window replacements will be placed. The glass must be positioned against the putty on both sides. If needed, lightly tap your glass into the rabbet with your thumb.

If the new pane is cracked you can fill it with a solvent-based glue or silicone caulk prior pressing it into the sash. Otherwise, you'll need to putty over the crack to create an impervious seal to keep water out. After the putty has dried and the film is oily, wipe it off the glass using an abrasive and allow it to dry completely prior to painting. Paint before the putty has completely dried. It will not create a solid seal and may be leaking or discoloring over time.

Paint

If you've suffered a break in a window pane, you might be worried about the expense of a new one. However, replacing one glass pane does not have to break the bank when you do it yourself. In fact even windows with double panes can be replaced at only a fraction of the cost of a professional.

If you're working with large glass windows, first make sure it is securely attached to the frame. Using the proper tools and techniques to complete this task easily and speedy.

When you are ready to begin taking down the old window pane. Pry out the glazing points made of metal that are attached to it. These are basically small metal triangles that act as "nails" which hold the window in in the wood frame. They are submerged beneath a glaze putty or bead which hardens into an unbreakable wedge which holds the wood frame securely in place and conceals the edges.

After taking off the old pane clean the frame and the wood. Scrape off any paint that has been used and sand down the rabbet grooves that the glazing points were. These should be sanded down to bare wood, to allow you to paint them the same color as the rest of the frame. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

The next step is to determine the size of the window's opening. It is necessary to measure the vertical and horizontal dimensions of the entire opening, as well as the thickness. 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 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.