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How to Replace Window Panes

A damaged or cracked window can be a nuisance. This can be an opportunity to upgrade to energy-efficient windows or insulated ones, and reap advantages like improved comfort, increased resale value and lower utility costs.

This is a project you could take on yourself for a fraction of the cost of hiring a professional. It requires the right equipment and an hour or two of your time.

Glass

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

Begin by removing any broken pieces of glass. This is best done using the help of pliers however, flathead screwdrivers can work in a pinch. Make use of a wood chisel or putty knives, to take away any old putty remaining around the frame and window sash. Be careful not to damage the window replacement panes sash. Work slowly and carefully. This is best done on a ladder, not the ground. Also, ensure that someone on the ground to ensure it is held steady.

Prepare the window pane replacement frame to receive the new pane after you have removed the old glue. To allow for seasonal expansion or contraction by subtracting 1/8 inch from the measurements of the width and height. These measurements can be taken to an hardware or home centers store to have cut a piece of stock glass to the right size. Alternately, you can cut the glass yourself if have the appropriate tools.

After putting in the new pane, run a small bead of caulking around the edge to seal it against weather. Then, place a glazier's tip on each side of the frame to hold the pane in the right place. The points shouldn't be too tight as to cause friction between the sash and the frame however they shouldn't be loose.

Before applying the putty on the surface, you must knead it thoroughly until it is soft and free of lumps. Roll it into pencil-sized strips. The first strip should be placed to the corner of the frame, moving from one corner to the next so that it is smooth and even.

Glazier's Points

The glazier’s points are small triangular metal pieces which help to secure the glass to the frame without damaging the delicate surface. Knowing how to use these tiny pieces of help is simple and can save you money on a professional installation or the Cost Of A Window Replacement of buying new glass.

After getting rid of the old putty glazier points as well as any remaining remnants clean the frame thoroughly using an utility knife. Lightly sand the frame in the rabbet grooves if needed to smooth rough areas. If you do sand the wood, make sure to protect it with painter's tack to avoid accidental damage.

Write down the exact dimensions of the frame. These measurements can be taken to an hardware or home centers store and the new pane will be cut a bit smaller. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new window in the frame and push it in place with your hand. Then use the point of your chisel or the back end of the putty knife to pierce the glazier's facets, as illustrated in Figure 11. The glazier's point should be flush against the top edge of your pane and the raised shoulders should be just beneath that lip.

Apply a thin bead of glazing compound over the edges of the glass that has been made and into the rabbet grooves, to seal and protect them. Allow it to dry completely and cure.

Install the new window replacement glass sash when the glazing compound has dried. First, saturate the wood with a thick coat of linseed oil. This will prevent the new 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 employ the chisel or back end of the knife to gently press the new sash and glazier's tips into the rabbet grooves. Repeat this process every 10 inches around the frame's perimeter.

Putty

A baseball thrown or a rock thrown by error, or a fallen tree could result in a broken or cracked window pane. The majority of windows can be repaired easily by installing a new piece. The glass is held in place using tiny metal clips known as a glazier's point, and putty, also called glazing compound. Before installing a replacement pane, first take out the old one and clean up the area with a rag and the pull-type paint scraper or a wood chisel. Wear safety glasses and gloves while you do this work. If the window is glued to the frame, you'll need to use a heat gun to soften the adhesive before cutting it loose.

If you are planning to replace the original sash in the future, take care to remove the molding pieces that hold the old pane in place. Then you can sand the sash down to ensure it's level and ready to be re-caulked. After the sash has been reinstalled then, you can apply a silicone caulk to 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 window replacement, which is where the glass is. If they are hard to cut, place the hand tool, such as a heatgun over them to allow them to soften before. If you're using a heat gun, be cautious not to scratch the railings or sash by using the tool too tightly.

After the old points of glazing and putty have been removed make a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Then, push it into the rabbets where the glass will be. It's important that the glass rests against the putty in all places on each side, so if you need to, lightly tap the glass into the rabbet with your thumb.

If the new pane has damaged, you can use a silicone caulk or glass glue based on solvents to fill in the crack before pressing it in the sash. If not, you'll have to apply putty over the crack to form a tight seal and keep water out. Once the putty is dry clean the oily film from the glass and allow it to dry completely before you paint. Paint before the putty has dried completely. It won't make a strong seal and could leak or discolor with time.

Paint

If you've had a broken window pane, you may be worried about the expense of replacing it. In reality, replacing a single piece of glass doesn't need to be costly when you do it on your own. In fact windows with double panes can be replaced at less than the cost of a professional.

First, if you're working on a large window, make sure that it is securely fixed to the frame. By using the correct tools and techniques to complete this task easily and fast.

When you are ready to begin with the removal of the window pane. Take out the metal glazing points attached to it. These are tiny triangles of metal that function as "nails" to hold the window in the frame. They are placed beneath a layer of glazing putty, which transforms into a solid molded wedge that secures the window in place and conceals the 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 down the rabbet grooves that the glazing points were placed. Sand them down to clean wooden surfaces, allowing you to paint the frames with the same shade. After the sanding process, apply a coat of flax oil on the wood's surface to prolong its life.

Then, you need to measure the size of the window's opening. It is necessary to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. To get the exact size of the new pane subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass. You can take these measurements to a hardware store or home improvement shop and have the glass 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.