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How to Replace Window Panes

A cracked window pane is an inconvenience. It could be a chance to upgrade to energy-efficient windows or insulated ones, and reap benefits such as improved comfort, increased resale values and reduced utility bills.

This is a project you could take on yourself for only a fraction of the cost of hiring a professional. You'll need only the proper tools and a few hours of your time.

Glass

Replace your single-paned windows using tempered or insulate glass to improve energy efficiency, cut down on noise, and protect the historical integrity of your older home. The process of replacing windows is simple and can be done by homeowners with basic hand tools. You will also need a replacement Window Panels window pane, glazier's suggestions, pliers, and latex glaze putty. If needed you can use a heating gun to warm the old putty. Wear safety goggles and gloves before you begin. Working with broken glass could result in serious injuries.

Take out any broken glass pieces remaining. It is best to use pliers however a flathead could be used equally. After that, 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 damage the old window sash. It is a good idea to work using a sturdy ladder rather than on the ground and to have someone standing below the sash to help keep it in place.

Make sure that the window frame is ready to receive the new pane when you have removed the old putty. Measure the width and height of the opening in the sash, subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be taken to an hardware or home centers store to have a piece cut of glass that is in stock to the correct size. Alternatively, you can cut the glass yourself, if you have the tools you need.

After installing the new pane after installing the new pane, put a tiny amount of caulking along the edge to ensure it is weatherproof. Install a glazier's pointing on both sides of the frame. This will secure the pane. The points shouldn't be too tight that they create friction between the frame and sash, but they also should not be too loose.

Before applying the putty on the surface, knead thoroughly until it is soft and free from lumps. Roll it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from one corner to another to ensure it's even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of steel that allow glass to be secured to the frame without damaging the delicate surface. It's easy to understand how to use this hidden tool and you can save money on the cost of windows replacement of a professional installation.

After taking off the old putty, glazier points, and any other remnants Clean the frame thoroughly using a utility knife. Lightly sand the wood into the rabbet grooves if needed to smooth rough areas. If you sand wood, protect it with painter's tape to avoid accidental damage.

Write down the dimensions of the frame. These measurements can be brought to an hardware or home centers store and the new pane will be cut to a smaller size. This will ensure a tight fit, and allow for expansion and contraction.

Place the new pane into the frame and push it in place by using your hands. Then, you can use the point of your chisel or the back end of the putty knife to make a tap on the glazier's facets, as shown in Figure 11. After you're done, the points should be flush with the top edge of the pane. the shoulders of the points should be just below the rabbet's rim groove.

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

Once the glazing compound has dried 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 new putty from soaking up moisture and deteriorating and cracking over time. Apply this coat with a brush or the edge of your putty knife, and then use the chisel, or the back end of the knife to gently hammer the new sash and glazier's tips into the rabbet grooves. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball hit or a rock thrown by error, or a fallen tree can cause a broken or cracked window pane. Fortunately, the majority of windows can be repaired by simply putting a new piece of glass in its place. The glass is held into position by a small metal clip, also known as the glazier's point, and putty. This compound is also called glazing compound. Before installing a new pane, first take out the old one and clean the area using the help of a rag, an abrasive scraper that is a pull type or the wood chisel. Wear safety glasses and gloves when you work. If the replacement window pane is secured to the frame, you'll need employ a heat gun in order to soften the adhesive before taking it off.

If you're planning to install the original sash, gently remove any molding pieces that secure the old pane. Then, sand the sash to make sure it's flat and ready for a new caulk. Once the sash is put back in place then, you can apply a silicone caulk over the glass. This will ensure that it won't be leaking or fade over time.

Take out the glazing points in the rabbets. These are the grooves on the sash, where the glass is located. If they are hard to cut, place the hand tool, such as a heating gun over them to allow them to soften before. When using a heating tool, be careful to not scratch the sash and its railings.

Make the bed for your new pane after you have removed the old putty and glazing points. Roll a rope with glazing compound between your fingers, and then make it about 1/2 inch thick. Then, press it into the rabbets where the glass will be. The glass must rest against the putty on both sides. If you need to, lightly tap your glass into the rabbet using your thumb.

If the new pane has a crack, you can cover it with a solvent-based glue or silicone caulk prior to pressing it into the sash. If the crack is not sealed, you will need to use putty to keep the water out. Once the putty is dry remove the oily film off of the glass and let it dry completely before painting. If you paint before the putty has completely dry, it won't form an effective seal and could be leaking or discoloring over time.

Paint

You might be worried about replacing a damaged piece of glass. It's true that replacing a single piece of glass doesn't have to be expensive even if you do it your own. Even a double-paned window cost replacement could be replaced for a fraction of the price it costs an expert.

First, if you're working on a large-sized window, make sure it is securely attached to the frame. This job can be done relatively easy and fast with the right tools and techniques.

When you are ready to begin taking down the old window pane. Pry out the metal glazing points attached to it. These are small metal triangles that act as "nails" that hold 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 hides 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 down to bare wooden surfaces, allowing you to paint the frames with the same color. After sanding the wood then apply a layer of flax oil. This will help prolong the life of the frame.

Next, measure the dimensions of the replacement window panels opening. It is necessary to take horizontal and vertical measurements of the entire opening, as well as the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure you have the exact size for the new pane. This will also allow for expansion and contraction of the glass during seasonal changes. You can bring 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 replacement glass 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.