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How to Replace Window Panes

A damaged or cracked window is an inconvenience. This can be an opportunity to upgrade your windows to energy efficient or insulated ones, and reap advantages like improved comfort, increased resale value and reduced utility costs.

It's a task you can take on yourself for a fraction of the cost of hiring a professional. You'll need only the right tools and a few hours of your time.

Glass

If your single-pane windows are outdated damaged, cracked or deteriorating, replacing them with newer insulated or tempered glass can increase energy efficiency and decrease noise while also preserving the original character of older homes. Most homeowners with basic hand tools can replace windows with ease. Alongside a replacement glass for windows pane, the following items are needed for the replacement process: latex glazing putty Glazier's points; pliers and a heat gun for warming the old putty, if necessary. Before starting, wear protective gloves and goggles since working with broken glass may cause injuries.

Begin by removing any remaining broken pieces of glass. This is best accomplished with pliers, though using a flathead screwdriver may work in a pinch. After that, use a wood chisel or putty knife remove the remaining old putty from around the frame and sash. Be careful and slow and be careful not to damage the old window sash. This can be done best on a ladder, not the ground. Also, ensure that someone lower to ensure it is held steady.

Prepare the window frame to receive the new pane when you have removed the old putty. Measure the width and height of the sash opening by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Take these measurements to the nearest hardware store or home center, and find a piece glass cut to size. You can cut the glass yourself if you possess the right tools.

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

Before putting the putty on, make sure to knead it until it is soft and free of lumps. Then, roll it into pencil-size strips. The first strip should be glued to the corner of the frame. Work from one corner to the next and ensure that it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of metal which help to secure the glass into the window frame without causing any damage to the fragile surface. It's easy to learn how to use this secret tool, and you'll be able to save money on the expense of a professional installation.

After removing the old putty, glazier points, and any other leftovers, clean the frame thoroughly with an utility knife. Lightly sand the wood into the rabbet grooves if needed to smooth out rough areas. If you decide to sand wood, protect it with painter's tape to prevent accidental damage.

Take the dimensions of the frame and record precise measurements. Take these dimensions to a hardware store or a 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.

Insert the new pane into the frame and push firmly with your hands. Make use of the chisel's point, or the edge of the putty blade to smudge the glazier's points, as shown in Figure 11. The glazier's points should sit aligned with the top edge of your pane and the shoulders raised should be just beneath that lip.

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

Install the new window sash once the glazing compound has dried. First, coat the wood with a thick layer of linseed. This will stop the new putty from taking up moisture and deteriorating and cracking over time. Apply the coat using a brush or the edge of your putty knife, then use the chisel or the back end of the knife to gently hammer the new sash and glazier's points into the grooves of the rabbet. Repeat this process at intervals of 10 inches around the frame.

Putty

A baseball thrown at you, an errant rock or a fallen branch can cause a window to crack or break. The majority of windows replacement glass can be replaced easily by simply putting in a fresh piece. The glass is held into place by a small metal clip, referred to as a glazier's point and putty. This compound is also known as glazing compound. Remove the old pane and clean the area with a rag, a scraper that is a pull type or a wood chisel. Wear protective glasses and gloves when working. You'll need a heat gun in the event that the window is glued into the frame.

If you're planning to install the original sash, take off the molding that holds the old pane. Then you can sand the sash down to make sure it's flat and ready for new caulk. After the sash has been reinstalled then, you can apply a silicone caulk on the glass. This will ensure that it doesn't be leaking or fade over time.

Take out the glazing points in the rabbets. These are the grooves on the sash, where the glass is located. If they're hard to chisel out, you can try holding the hand tool, such as a heat gun to soften them before you do. When using a heating tool, be careful to avoid damaging the sash's railings and sash.

Create the bed for your new pane after you have removed the old glaze and putty. Roll a piece of glazing compound between your hands, forming it to be about 1/2-inch thick. Place it into the rabbets where the glass Window replacements will be put. It is crucial that the glass is positioned against the putty on each side, so if you need to tap it, gently press the glass into the rabbet using your thumb.

If the new pane is 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 the crack isn't sealed, you'll require putty to keep water out. Once the putty is dry clean the oily film off of the glass and allow it to dry completely before you paint. If you paint before the putty is completely dry, it won't create a solid seal and could be leaking or discoloring in time.

Paint

You might be worried about replacing a damaged piece of glass. The truth is, replacing a single pane glass doesn't have to be expensive if you do it on your own. In fact, even a double-pane window can be replaced at only a fraction of the cost of a professional.

If you're working with a large glass window, first make sure it is securely fixed to the frame. Using the proper tools and techniques, you can accomplish this task fairly easily and quick.

If you're ready to begin with the removal of the old window by prying out the glazing points of metal that are attached to it. These are tiny triangles of metal that act as "nails" that hold the window in place. They are buried beneath a bead or glazing putty that hardens to a solid wedge that holds the frame in place and conceals the edges.

After you have removed the old pane removed clean the surrounding frame and wood. Scrape away any paint and sand down the rabbet grooves, where the glazing points were. Sand them down to bare wooden surfaces, allowing you to paint the frames the same shade. After sanding, apply a coat of flax oil on the wood that is not sanded down to prolong its life.

Next, measure the dimensions of the window opening. It is necessary to take vertical and horizontal 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 also allow for expansion and contraction of the glass during seasonal change. Bring these measurements to the 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.