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How to Replace Window Panes

A damaged window pane can be a nuisance. It could also be an opportunity to upgrade your glass to energy-efficient or insulated windows and benefit from more comfort, higher the value of resales and lower utility costs.

You can do it yourself for a fraction of what it would cost to employ an expert. It requires the right tools and only an hour or two of your time.

Glass

Replace your old single-paned windows with tempered or insulated glass to increase energy efficiency, reduce noise, and maintain the historical integrity of your older home. The replacement of a window pane is relatively simple and can be done by anyone with basic hand tools. In addition to a replacement windows pane, the following items are needed for the replacement process: latex glazing putty pliers, glazier's points and the use of a heat gun to warm the old putty, if necessary. Wear safety glasses and gloves prior to starting. Working with broken glass can cause serious injuries.

Take out any broken glass pieces that remain. This can be done with a pair of pliers, however, flathead screwdrivers can be effective in the pinch. Make use of a wood chisel or putty knives, to take away any remaining old putty around the frame and window sash. Be careful to not damage the window sash. Take your time and work slowly. It is a good idea to do this using a sturdy ladder rather than on the ground, and to have someone standing below the sash to help keep it steady.

After you have removed all the old putty, prepare the window frame to accommodate the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. Bring these measurements to a hardware store or home center, and have a piece of stock glass cut to size. You can also cut the glass by yourself if you have the appropriate tools.

After installing the new glass, apply caulking to the edge. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will secure the pane. The points shouldn't be so tight that they cause friction between the sash and the frame, but they also shouldn't be too loose.

Before applying the putty to the surface, knead thoroughly until it is soft and free of lumps. Roll it into pencil-sized strips. Apply the first strip to the corner of the frame. Work from corner to corner and ensure that it is even and smooth.

Glazier's Points

The glazier's facets are small triangular pieces that allow glass to be secured into frames for windows without scratching or damaging the fragile surface. It's simple to learn how to use this secret tool and you can save money on the expense of an installation by a professional.

After getting rid of the old putty glazier points as well as any remaining residue, clean the frame thoroughly using a utility knife. Lightly sand the frame in the rabbet grooves if needed to smooth out rough areas. If you sand wood cover it with painter's tape to prevent accidental damage.

Measure the empty frame's dimensions and note down precise measurements. These dimensions can be taken to a home center or hardware store, and the new frame will be cut a bit smaller. This will ensure a secure fit and leave room for expansion and contraction.

Insert the new pane into the frame and push firmly with your hands. Then, you can use the point of your chisel or the back of the putty knife to pierce the glazier's points 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 below that lip.

Apply a small amount of glazing compound over the edges of the new glass and into the rabbet grooves, to seal and protect them. Let it dry and cure completely.

Once the glazing compound has dried it's time to put in the new window sash. First, saturate the wood with a thick coat of linseed oil. This will stop the new putty from drying out and cracking as it absorbs moisture. Apply the coating using a brush this coat, or the point of the blade. Then use the chisel on the back of the putty tool or the back of the putty handle to gently hit the new sash, or glazier's point into the grooves of the rabbet. Repeat this procedure every 10 inches around the frame's perimeter.

Putty

A baseball that is thrown or a rock that is errant or a falling branch can cause a window pane to crack or break. Fortunately, windows can be replaced by simply placing a new piece in the right place. The glass is held in place by small clips made of metal called a glazier's point, and putty, which is often called glazing compound. Remove the old pane and clean the area using the rag, a scraper that is a pull type or a wood chisel. Wear safety glasses and gloves while working. If the window is secured to the frame, you'll have to employ a heat gun in order to soften the adhesive prior to taking it off.

If you plan to reinstall the original sash, remove the molding pieces that are used to secure the old pane. Then you can sand the sash down to ensure it's smooth and ready for a 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 in time.

Remove the glazing points from the rabbets. These are the grooves on the sash, which is where the glass is located. If they're hard to chisel, use the hand tool, such as a heating gun over them to soften first. If you're using a heated gun, be careful not to damage the sash or its railings by placing the tool too close.

Once the old points of glazing and putty have been removed make a bed for the new pane. Roll a rope of glazing compound between your hands, and form it into a 1/2-inch thick. Then, you can press it into the rabbets where the glass will sit. It is essential that the glass is positioned against the putty on each side So if you have to, lightly tap the glass into the rabbet with your thumb.

If the new pane has a crack, you can cover it with a solvent-based glue or silicone caulk before pressing it into the sash. If the crack isn't sealed, you will require putty to keep water out. When the putty dries, clean the oily film off the glass using an abrasive and allow it to dry completely before painting. If you paint before the putty has completely dry, it won't create a solid seal and could be leaking or discoloring over time.

Paint

If you've experienced a broken window pane, you may be worried about the expense of a new one. In reality, replacing a single piece of glass doesn't need to be costly if you do it on your own. Even double glazing replacement windows-paned replacements windows can be replaced at a fraction of the cost it will cost a professional.

If you are working on a large window, ensure that it is securely fastened to the frame. This task can be done relatively easy and fast using the proper tools and techniques.

If you're ready to begin taking off the old window by prying out the glazing points of metal that are connected to it. These are tiny triangles of metal that function as "nails" to hold the window in place. They are placed beneath a layer of glazing putty that is then cured to form a solid, molded wedge that secures the window in place and hides the edges.

After removal of the old pane clean the frame and the wood. Scrape off any paint that has been used and sand down the rabbet grooves where the glazing points were. Sand them down to clean wooden surfaces so you can paint the frames the same shade. After sanding the wood, apply a layer of flax oil. This will help to prolong the life of the frame.

The next step is to determine the width of the window's opening. It is necessary to measure the vertical and horizontal dimensions of the entire opening as well as the thickness. Subtract 1/8 inch from each measurement to ensure that you have the exact size for the new pane. This will also allow for expansion and contraction of the glass in times of seasonal changes. Take these dimensions 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 panes Replacement 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.