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How to Replace Window Panes

A damaged or cracked window is an inconvenience. This could be an opportunity to upgrade to energy-efficient windows or insulated ones to enjoy benefits like increased comfort, higher resale value and lower utility costs.

You can do it yourself for only a fraction of the cost it would cost to employ an expert. You'll only require the proper tools and a few minutes of your time.

Glass

Replace your single-paned windows with tempered or insulate glass to improve energy efficiency, cut down on noise, and preserve the historical integrity of your older home. The procedure of replacing the window pane is easy and can be completed by homeowners with basic hand tools. In addition to a replacement window panels pane, the following components are required: latex glazing putty; pliers, glazier's points and the use of a heat gun to warm the old putty, if needed. Before beginning, wear gloves and safety goggles as working with broken window replacement glass could cause injuries.

Begin by removing any remaining broken pieces of glass. This is best done using the help of pliers however, a flathead screwdriver may be effective in the pinch. Then, use a wood chisel or putty knife to remove the remaining old putty around the frame and the sash. Be careful not to break the window seal replacement sash. Take your time and work slowly. It is recommended to work using a sturdy ladder instead of the ground and to have someone stand below the sash to help hold it in place.

Once you've removed all the old putty, it is time to prepare the window frame to accommodate the new pane. 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 a hardware or home center store to have an item cut from glass that is in stock to the correct size. Alternately, you can cut the glass yourself, if you have the appropriate tools.

After putting the new pane in place, run a small bead of caulking around the edges to seal it against weather. Then, you can install a glazier's pointing on the frame's opposite side to secure the pane in place. The points should not be so tight as to cause friction between the replacement sash windows and the frame but they shouldn't be too loose.

Before applying the putty make sure to knead it until it's soft and free of lumps. Then, roll it into pencil-size strips. Apply the first strip to the corner of the frame, moving from one corner to the next so that it is even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces of metal that help secure glass into a window frame without scratching or damaging the delicate surface. Learning how to use these hidden tiny pieces of help is simple and can save you money on a professional installation or the cost of purchasing new glass.

After the old putty and the glazier's points have been removed Clean the frame thoroughly with a knife to remove any remaining traces. Lightly sand the frame in the rabbet grooves if needed to smooth rough areas. If you sand wood, cover it with painter's tape to avoid accidental damage.

Take measurements of the empty frame and record precise measurements. These dimensions can be taken to the hardware or home center store and the new pane will be cut a bit smaller. This will ensure a snug fit, and allow for expansion and contraction.

Place the new pane into the frame and push it in using your hands. Then, use the tip of your chisel or the back end of the putty knife to tap in the glazier's points, as illustrated in Figure 11. After you're done, the points should be in line with the top edge of the pane. the shoulders of the points should be below the rabbet's lip. groove.

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

After the glazing compound dries and the glazing compound is dry, you can install the new window sash. The first step is to coat the wood with an even layer of linseed. This will prevent the new putty drying out or cracking as it absorbs moisture. Use a brush to apply this coat, or the tip of the blade. Then use the chisel on the back of the putty tool or the back of the handle to gently hammer the new sash or glazier's tip into the rabbet grooves. Repeat this process in intervals of 10 inches all around the frame.

Putty

A baseball thrown at you or an unintentional rock, or falling branch could cause a window to crack or break. Luckily, most windows can be easily replaced by simply placing a new piece in the right place. The glass is held in place by tiny metal clips known as a glazier's point, and putty, also called glazing compound. Remove the old pane and clean the area using a rag, a pull-type scraper, or a wood chisel. Wear gloves and safety glasses while doing this work. If the window is glued to the frame, you'll need use a heat gun to soften the adhesive before taking it off.

If you're planning to replace the original sash, take off the molding that holds the old pane. Then sand the sash to ensure it's smooth and ready for new caulk. After the sash has been reinstalled, you can apply a silicone caulk over the glass. This will ensure that it doesn't leak over time or discolor.

Take out the glazing points in the rabbets. These are the grooves on the sash where the glass is. If they're difficult to chisel, use the hand tool, such as a heating gun over them to allow them to soften before. When using a heating tool, make sure to not scratch the sash or its railings.

Create a bed for your new pane after removing the old putty and glazing points. 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 placed. It is crucial that the glass sits on the putty on each side So if you have to do so, gently tap the glass into the rabbet with your thumb.

If the new pane has a crack then you can seal 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. Once the putty is dry, wipe the oily film off of the glass and let it dry completely before you paint. If you paint before the putty has completely dry, it won't create an effective seal and could discolor or leak over time.

Paint

You may be concerned about replacing a broken pane of glass. It's true that replacing a single pane glass doesn't need to be expensive even if you do it your own. Even a double-paned window could be replaced for a fraction of the price it costs an expert.

First, if you are working on a large window, ensure that it is securely fixed to the frame. With the right tools and techniques you can make this task relatively easy and speedy.

When you are ready to begin taking down the old window pane. Take out the metal glazing points that are attached to it. These are basically small metal triangles that function as "nails" that hold the window in within the frame of wood. They are submerged under a bead of glazing putty that is then cured to form a solid, formed wedge that holds the window firmly in place and hides the window glass replacement's points.

After removal of the old pane clean the frame and the wood. Scrape away any paint and sand down the rabbet grooves, where the glazing points were. Sand them down to bare wooden surfaces so you can paint the frames with the same color. After sanding the wood then apply a layer of flax oil. This will help extend its life.

The next step is to determine the size of the window's opening. It is necessary to take vertical and horizontal measurements of the entire opening, and also 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 for windows replacement in times of seasonal changes. Bring these measurements to a hardware or home improvement store and ask them to cut you 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.