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How to Replace Window Panes

A damaged window pane can be an inconvenience. It can also be a chance to upgrade your glass to energy efficient or insulated windows, and enjoy benefits such as more comfort, higher the value of resales and lower utility bills.

This is a project you could 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 also preserving the historic integrity of older homes. The process of replacing a window pane is relatively easy and can be accomplished by most homeowners who possess basic hand tools. In addition to a new pane, the following components are required: latex glazing putty; pliers, glazier's points and a heat gun for warming the old putty, if needed. Before starting, wear gloves and safety goggles as working with broken glass can cause injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers however, a flathead may be useful as well. Make use of a wood chisel or putty knife to get rid of any old putty remaining around the frame and the window sash. Be careful to not damage the window sash. Be careful and slow. It is a good idea to do this using a sturdy ladder instead of the ground and place someone on the sash to help hold it steady.

Once you have removed all the old putty, prepare the window frame to accommodate the new pane. Measure the width and height of the sash opening and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Take these measurements to an hardware store or home center, and get a piece of stock glass cut to size. You can cut the glass yourself if you possess the appropriate tools.

After putting the new pane in place after installing the new pane, put a tiny amount of caulking around the edges to seal it against weather. Install a glazier's pointing on both sides of the frame. This will secure the pane. The points should not be so tight that they cause friction between the sash and the frame, but they also shouldn't be too loose.

Before applying the putty knead it thoroughly until it is smooth and free of lumps. Then make it into pencil-sized strips. Place the first strip to the corner of the frame, working from one corner to the next to ensure it is even and smooth.

Glazier's Points

The glazier’s points are small triangular pieces of steel that allow glass to be secured into the window frame without causing any damage to the fragile surface. Knowing how to use these hidden little helpers is easy and can save you money on a professional installation or the cost of new glass.

After removing the old putty, glazier points, and any other residue clean the frame thoroughly using a utility knife. If needed, lightly sand the wood along the rabbet grooves to smooth rough areas. If you do sand the wood, be sure to protect it by using painter's tape to prevent accidental damage.

Note down the exact dimensions of the frame. These measurements can be taken to a home center or hardware store, and the new frame will be cut slightly smaller. This will ensure a snug fit, and allow for expansion and contraction.

Place the new pane into the frame and push firmly with your hands. Then, you can use the point of your chisel or the back of the putty knife to pierce the glazier's points as illustrated in Figure 11. After you're done, the points should be level with the top edge of the pane and the raised shoulders of the points should be below the rabbet's lip. groove.

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

Install the new window sash when the glazing compound has dried. The first step is to coat the wood with a heavy coat of linseed oil. This will prevent the newly-created putty drying out or cracking when it absorbs moisture. Apply this coat using a brush or the edge of your putty knife, then use the chisel, or the back end of the knife to gently press the new sash and glazier's point into the rabbet grooves. Repeat this procedure every 10 inches along the perimeter of the frame.

Putty

A baseball thrown at you or an unintentional rock, or a fallen branch can cause a window to break or crack. Most windows can be replaced easily by simply putting in a fresh piece. The glass is held in place with a small metal clip called a glazier's point and putty, which is often called glazing compound. Remove the old pane and clean the area with an abrasive, scraper that is a pull type or a wood chisel. Wear safety glasses and gloves when working. You'll need a heat gun when the window is fixed to the frame.

If you're planning to replace your original sash, remove the molding 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 over the glass. This will ensure that it won't be leaking or fade over time.

Take the glazing points out of the rabbets and the grooves in the sash, where the glass sits. If they're difficult to cut out, try holding a hand tool like a heat gun over them to soften them up first. When using a heated tool, be careful to not damage the sash window replacement or its railings.

Prepare the bed for your new pane by removing the old glaze points and putty. Roll a rope of glazing compound between your hands, and form it to be 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 necessary gently tap your 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 prior to pressing it into the sash. If the crack isn't sealed, you'll require 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. If you paint before the putty has completely dry, it won't form an effective seal and could leak or discolor in time.

Paint

You may be concerned about replacing a broken piece of glass. However, replacing one glass pane does not require a huge amount of money when you do it yourself. Even a double glazing replacement windows-paned window could be replaced for a fraction of the price it would cost an expert.

If you're working with large glass windows first, ensure that it is securely attached to the frame. By using the correct tools and techniques you can accomplish this task fairly easily and fast.

Once you're ready to begin with the removal of the old window by prying out the glazing points made of metal that are connected to it. These are basically small metal triangles that function as "nails" which hold the window replacements near me in in the wood frame. They are placed under a bead or glazing putty that sets to form solid wedge that holds the frame in place and hides the points.

After you have the old pane taken away Clean up the frame and wood. Scrape off any old paint, and sand the rabbet grooves where the glazing points were. These should be sanded down to bare wood to allow you to paint them the same color as the rest the frame. After sanding, apply a layer of flax oil to the bare wood to extend the life of the frame.

The next step is to determine the size of the window opening. You will need to take vertical and horizontal measurements of the entire opening as well as 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 change. You can bring these measurements to a hardware store or home improvement shop and get the glass replacement for windows 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.