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How to Replace window Replacement Glass Panes

A damaged or cracked window is an issue. It can also be a chance to upgrade your glass to energy-efficient or insulated windows to reap benefits like greater comfort, a higher the value of resales and lower utility costs.

You can do it yourself for less than what it would cost to employ an expert. You only need the right tools and a few hours of your time.

Glass

If your single pane windows are old, deteriorating or broken replacing them with modern glass that is tempered or insulated can increase energy efficiency and decrease noise while also preserving the historic integrity of older homes. The replacement of a window pane is relatively simple and can be done by anyone with basic hand tools. You will also need an additional 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. Wear safety glasses and gloves prior to beginning. Working with broken glass replacement in windows could cause serious injuries.

Take out any broken glass pieces remaining. It is recommended to use pliers, but a flathead can be used as well. Then, use a wood chisel or putty knife to remove the remaining old putty from the frame and sash. Work slowly and carefully and be careful not to break the existing window sash. It is a good idea to work on a stable ladder instead of the ground and to have someone standing below the sash in order to help hold it in place.

Make sure that the window frame is ready to accept the new pane after you have removed the old glue. To allow for seasonal expansion or contraction and contraction, subtract 1/8 inch from the measurements of width and height. Take these measurements to a hardware store or home center, and find a piece glass cut to size. You can cut the glass yourself if you possess the appropriate tools.

After putting in the new pane After installing the new pane, apply a small amount of caulking around the edges to seal it against weather. Install a glazier's point on both sides of the frame. This will help secure the pane. The points should not be so tight as to cause friction between the sash and the frame but they shouldn't be too loose.

Before applying the putty make sure to knead it until it is smooth and free of lumps. Cut it into pencil-sized pieces. The first strip should be placed in the corner of the frame, working from one corner to another to ensure it is even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces that allow glass to be secured into the frame of a window without scratching or damaging the delicate surface. Knowing how to use these little helpers is easy and could save you money on a professional installation or the cost of purchasing new glass.

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

Take the dimensions of the frame and write down accurate measurements. Bring these measurements to a hardware store or home center, and have the new pane cut smaller than the frame's opening. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new pane in the frame and push firmly with your hands. Then, use the tip of your chisel or back of the putty knife to tap in the glazier's facets, as shown in Figure 11. When you're done, they should be in line with the top edge of the pane, and the raised shoulders of the points should be just below the lip of the rabbet groove.

Apply a thin bead of glazing compound on the edges of the new glass and in the rabbet grooves, to seal and protect them. Let it dry and cure completely.

Install the new window sash after the glazing compound has dried. First, coat the wood with a thick coat of linseed oil. This will prevent the new putty from taking in the moisture and drying out and cracking with time. Use a brush to apply this coat, or the tip of the putty blade. Then use the chisel that is on the back of the tool or the back of the putty handle to gently hammer the new sash or glazier's point into rabbet grooves. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball thrown at you or an unintentional rock, or falling branch could cause a window to break or crack. Luckily, most windows can be replaced by simply placing a new piece of glass in its the proper place. The glass is held in place with small clips made of metal called a glazier's point, and putty, also called glazing compound. Before you install a new pane, first remove the old one and clean up the area using a rag and a pull-type paint scraper or a wood chisel. Wear protective glasses and gloves while doing this work. You'll need a heat gun if the window is glued into the frame.

If you're planning to reinstall the original sash, take off the molding that holds the old pane. Sand the sash until it is flat and ready for new caulk. Once the sash is re-installed, apply a new silicone caulk to the glass to ensure it will not leak or change color over time.

Remove the glazing points in the rabbets. These are the grooves on the sash where the glass is located. If they're hard to cut, place the hand tool, such as a heatgun over them to soften first. When using a heat tool, be careful to not scratch the sash and its railings.

Make the bed for your new pane by removing the old glaze points and putty. Roll a rope of glazing compound between your fingers and make it around 1/2 inch thick. Then, press it into the rabbets in which the glass will sit. The glass must be positioned against the putty on both sides. If needed you want to tap your glass lightly into the rabbet using your thumb.

If the new pane has cracked, you can use a silicone caulk or glass glue based on solvents to fill in the crack before pressing it into the sash. If the crack is not sealed, you'll need to use putty to keep water out. Once the putty is dry clean the oily film off of the glass and let it dry completely before you paint. If you paint before the putty is fully dry, it will not form an effective seal and could leak or discolor in time.

Paint

If you've had a broken window pane, you might be concerned about the expense of replacing it. But the truth is that replacing a single glass pane doesn't have to break the bank if you do it yourself. In fact, even a double-pane window replacement can be replaced at a fraction of the cost of an expert.

If you are working with a large glass window first ensure it is securely attached to the frame. Using the proper tools and techniques to accomplish this task fairly easily and fast.

When you are ready to start with the removal of the window pane. Take out the metal glazing points attached to it. They are basically tiny metal triangles which function as "nails" that 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, moulded wedge which holds the window in place and conceals the points.

After taking off 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 the same shade. After sanding, apply a coat of flax oil to the wood that is not sanded down to extend the life of the frame.

Then, you need to measure the width of the window sash replacement opening. You'll need 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 get the exact measurement for the new pane. This will also allow for expansion and contraction of the glass during seasonal changes. You can take these measurements to a hardware store or home improvement store 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.