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How to Replace Window Panes

A damaged window pane can be a nuisance. 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 costs.

You can do it yourself at only a fraction of the cost it would cost to hire an expert. It requires the right equipment and an hour or two of your time.

Glass

Replace your old single-paned windows using tempered or insulate glass to improve energy efficiency, cut down on noise, and protect the historical integrity of your old home. Most homeowners with basic hand tools can Replace Window Pane the window pane. You'll also require a replacement window pane, glazier's suggestions, pliers, and latex glazing putty. If you need to you can use a heating gun to warm the old putty. Before starting, put on protective gloves and goggles since working with broken glass can cause injuries.

Begin by removing any broken pieces of glass. It is recommended to use pliers, but a flathead can be useful equally. Make use of a wood chisel or putty knives to remove any old putty remaining around the frame and the window sash. Take your time and work slowly and be careful not to break the existing window sash. It is recommended to work on a stable ladder instead of the ground and to have someone stand below the sash to help keep it in place.

Prepare the window glass replacement frame to accept the new pane once you have removed the old putty. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of width and height. These measurements can be taken to a hardware or home center store to have a piece cut of glass stock to the proper size. You can also cut the glass yourself if you have the right tools.

After putting in the new pane After installing the new pane, apply a small amount of caulking along the edge to seal it against weather. Install a glazier’s point on both sides of the frame. This will help secure the pane. The points shouldn't be so tight that they create friction between the sash and frame however they shouldn't be too loose.

Before applying the putty, work it in a gentle manner until it is soft and free of lumps. Make it into pencil-sized strips. Apply the first strip to the corner of the frame. Work from one corner to the next to ensure it's even and smooth.

Glazier's Points

The glazier's facets are small triangular pieces of metal that allow glass to be secured into the frame of a window without damaging or scratching the delicate surface. It's simple to learn how to use this hidden tool, and you'll be able to save money on the cost of a professional installation.

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

Take measurements of the empty frame and note down precise measurements. These measurements can be brought to a home center or hardware store, and the new pane will be cut slightly smaller. This will ensure a secure fit, and allow for expansion and contraction.

Place the new pane into the frame and push firmly using your hands. Then, use the tip of your chisel or the back end of the putty knife to pierce the glazier's points, as illustrated in Figure 11. The glazier's points should sit in line with the top edge of your pane and the shoulders should be just beneath that lip.

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

Install the new window sash when the glazing compound has dried. First, you need to coat the wood with an even layer of linseed. This will prevent the newly-created putty from drying out or cracking when it absorbs moisture. Apply the coating using a brush this coat, or the point of the putty blade. Then, use the chisel that is on the back of the putty tool or the back of the putty handle to gently hammer the new sash or glazier's tip into the rabbet grooves. Repeat this process every 10 inches around the frame's perimeter.

Putty

A baseball hit or a rock thrown in error, replace window Pane or a tree falling could result in a broken or cracked window pane. Fortunately, the majority of windows can be replaced by simply placing a new piece in the proper place. The glass is held in place with small clips made of metal called a glazier's point, and putty, which is often called glazing compound. Before installing a replacement double glazing windows pane, first take out the old one and clean the area with the help of a rag, an abrasive scraper that is a pull type or a wood chisel. Wear safety glasses and gloves while doing this work. If the window is glued to the frame, you'll need to employ a heat gun in order to soften the adhesive before prying it free.

If you are planning to reinstall your original sash, you must remove the molding that holds the old pane. Sand the sash until it is flat and ready to receive new caulk. Once the sash is reinstalled it is possible to apply a silicone caulk over 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, which is where the glass is located. If they're difficult to cut out, you can try holding the hand tool, such as a heat gun to soften them first. If you're using a heating gun, be careful not to cause damage to the railings of the sash or the sash itself by using the tool too closely.

Prepare a bed for your new pane after you have removed the old putty and glazing points. Roll a rope of glazing compound between your hands, shaping it into a 1/2-inch thick. Then, push it into the rabbets in which the glass will rest. It is essential that the glass sits on the putty in all places on both sides, so if you need to do so, gently tap the glass into the rabbet using your thumb.

If the new pane has cracked, you can apply a silicone caulk or a glass glue made from solvents to seal the crack prior to pressing it into the sash. If the crack isn't sealed, you will need to apply putty to keep water from getting in. When the putty dries and the film is oily, wipe it off the glass using a rag and allow it to dry completely prior to painting. If you paint before the putty is completely dry, it will not form a strong seal and may be leaking or discoloring in time.

Paint

You may be concerned about replacing a broken pane of glass. The truth is, replacing a single pane glass doesn't need to be costly if you do it on your own. Even double-paned windows can be replaced for a fraction of what it costs a professional.

First, if you're working on a large-sized window, ensure that it is securely fastened to the frame. This task can be done relatively easy and fast with the proper tools and techniques.

When you are ready to start, remove the old window pane. Pry out the glazing points made of metal that are attached to it. They are basically tiny metal triangles that act as "nails" which hold the window in place in the wood frame. They are placed beneath a layer of glazing putty, which is then cured to form a solid, formed wedge that holds the window firmly in place and conceals the window's points.

Once you have the old pane taken away, clean up the surrounding frame and wood. Scrape off any paint that has been used and sand the rabbet grooves in which the glazing points were. They should be sanded to bare wood so that you can paint them the same shade as the rest of the frame. After the sanding process, apply a coat of flax oil to the wood that is not sanded down to help extend its lifespan.

The next step is to determine the width of the window's opening. You will need to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure that you get a precise size for the new pane. This will allow for seasonal changes in the glass. Take these measurements to a hardware or home improvement store and have cut the glass 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.