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How to Replace Window Panes

A cracked window pane can be a source of frustration. It could be a chance to upgrade to energy-efficient windows or insulated ones, and reap benefits such as improved comfort, increased resale value and reduced utility bills.

It's a project you can tackle yourself at a fraction of the cost of hiring an expert. You'll need only the appropriate tools and a few minutes of your time.

Glass

Replace your single-paned windows with tempered insulated glass to increase energy efficiency, cut down on noise, and preserve the historical integrity replacement of window glass your old home. A majority of homeowners with hand tools can replace a window pane. You'll also require a replacement sash windows Cost window pane, glazier's suggestions, pliers, and latex glaze putty. If necessary, you can use a heating gun to warm the old putty. Wear safety glasses and gloves prior to starting. Working with broken glass could cause serious injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers for this, but a flathead can be useful equally. Use a wood chisel, or putty knives to remove any remaining old putty around the frame and window sash. Be careful and slow making sure not to damage the old window sash. It is recommended to do this on a stable ladder rather than the ground and place someone on the sash in order to help hold it in place.

Make sure the window frame is ready to accommodate the new pane after you have removed the old glue. Take measurements of the width and height of the opening for the sash, subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be taken to a home center or hardware store to get a piece cut of glass stock to the proper size. You can also cut the glass by yourself if you possess the appropriate tools.

After putting the new pane in place, run a small bead of caulking around the edge to seal it against weather. Then install a glazier's point on each side of the frame to hold the pane in its place. The points should not be so tight as to cause friction between the sash and the frame but they should not be too loose.

Before applying the putty, knead it thoroughly until it is soft and free of lumps. Roll it into pencil-sized strips. Apply the first strip to the frame's corner. Work from corner to corner and ensure that it is even and smooth.

Glazier's Points

The glazier’s points are small triangular pieces of steel that help secure the glass into the window frame without causing damage to the delicate surface. It's easy to learn how to use this nefarious tool, and you'll be able to save money on the expense of an expert installation.

After removing the old putty, glazier points and any leftovers clean the frame thoroughly with an utility knife. If needed it is necessary to lightly sand the wood along rabbet grooves to smooth rough spots. If you decide to sand wood, cover it with painter's tape to protect it from damage caused by accidental sanding.

Measure the empty frame's dimensions and record precise measurements. These measurements can be taken to an hardware or home centers store and the new pane will be cut slightly smaller. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Place the new window in the frame and press it in place using your hand. 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. When you're done taping, they should be level with the top edge of the pane, and the shoulders of the points should be below the rabbet's rim groove.

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

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

Putty

A baseball hit, a rock thrown in error, or a fallen tree can cause a broken or cracked window pane. Fortunately, the majority of windows can be easily replaced by simply putting a new piece of glass in its the proper place. The glass is held in place by a small metal clip, referred to as a glazier's point and putty. This compound is also known as glazing compound. Remove the old pane and clean the area using a rag, a scraper that is a pull type or a wood chisel. Wear gloves and safety glasses when working. You'll need a heat gun if the window is glued to the frame.

If you are planning to reinstall your original sash, remove the mold that holds the old pane. Sand the sash until it is flat and ready to receive new caulk. Once the sash is re-installed and sanded, apply a fresh silicone caulk to the glass to ensure it won't leak or discolor over time.

Remove the glazing points from the rabbets and the grooves in the sash, where the glass sits. If they're difficult to work out, try placing a hand tool like a heat gun to soften them first. When using a heat tool, be sure to avoid damaging the sash's railings and sash.

After the old glazing points and putty are removed, make a bed for the new pane. Roll a piece of glazing compound between your hands, shaping it into a 1/2-inch thick. Press it into the rabbets where the glass will be put. The glass should rest against the putty on both sides. If necessary, lightly tap your glass into the rabbet using your thumb.

If the new pane is cracked then you can seal it with a solvent-based glass glue or silicone caulk prior pressing it into the sash. If the crack is not sealed, you will need to apply putty to keep water from getting in. Once the putty is dry remove the oily film from the glass and let it dry completely before you paint. If you paint before the putty has completely dry, it will not form a solid seal and could leak or discolor in time.

Paint

If you've had a broken window pane, you might be worried about the expense of replacing it. But the truth is that replacing a single glass pane doesn't require a huge amount of money If you can do it yourself. Even a double-paned window could be replaced for a fraction of the price it costs an expert.

If you are working on a large-sized window, make sure it is securely fastened to the frame. This is relatively easy and fast using the right tools and techniques.

Once you're ready to begin, begin by removing the old window pane by prying out the glazing points of metal that are attached to it. These are tiny triangles of metal which act as "nails" that hold the window in the frame. They are submerged beneath a layer of glazing putty, which is then cured to form a solid, moulded wedge that holds the window firmly in place and hides the points.

After removing the old pane, clean the frame and the wood. Scrape off any paint that has been used, and sand the rabbet grooves where the glazing points were placed. Sand them down to bare wooden surfaces, allowing you to paint the frames with the same color. After sanding the wood you can apply a layer flax oil. This will help extend its life.

The next step is to determine the width of the window opening. You'll need to take vertical and horizontal measurements of the entire opening, as well as 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. Bring these measurements to a hardware or home improvement store and have a piece 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.