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How to Replace Window Panes

A cracked window pane is an inconvenience. It could also be an opportunity to upgrade your glass to energy-efficient or insulated windows to enjoy benefits such as more comfort, higher the value of resales and lower utility bills.

It's a project you can take on yourself for a fraction of the cost of hiring an expert. It requires the right tools and only an hour or two of your time.

Glass

If your single-pane windows are outdated damaged, cracked or deteriorating, replacing them with newer glass that is tempered or insulated will increase energy efficiency and decrease noise while maintaining the original character of older homes. The procedure of replacing a window pane is relatively simple and can be done by homeowners with basic hand tools. In addition to a new pane, the following components are needed: latex glazing putty; glazier's points; pliers; and an electric heater to warm the old putty, if needed. Before starting, wear gloves and safety glasses as working with broken glass may cause injuries.

Begin by removing any broken pieces of glass. This is best accomplished with a pair of pliers, but a flathead screwdriver can also work in the pinch. Utilize a wood chisel or putty knife to get rid of any old putty remaining around the frame and replacement window pane sash. Work slowly and carefully making sure not to damage the old window sash. It is a good idea to work using a sturdy ladder rather than on the ground, and to have someone standing below the sash to help hold it steady.

Prepare the window frame to accommodate the new pane once you have removed the old glue. Take measurements of the width and height of the opening in the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Bring these measurements to the nearest hardware store or home center, and get a piece of stock glass cut to size. You can cut the glass yourself if you possess the right tools.

After putting in the new glass Apply some caulking to the edge. This will make the glass weatherproof. Install a glazier's point on both sides of the frame. This will ensure the pane. The points should not be so tight as to cause friction between the sash and the frame however they should not be too loose.

Before applying the putty on the surface, knead thoroughly until it is soft and free of lumps. Cut it into pencil-sized pieces. Apply the first strip to the corner of the frame. Work from one corner to another, making sure it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of metal that help secure the glass to the frame without damaging the delicate surface. Knowing how to use these hidden little helpers is easy and can save you money on professional installation or the cost of buying 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 into the rabbet grooves to smooth out rough areas. If you decide to sand wood, protect it with painter’s tape to prevent accidental damage.

Measure the empty frame's dimensions and write down accurate measurements. Take these dimensions to an hardware store or home center and request that the new pane cut smaller than the frame's opening. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Insert the new pane into the frame and push firmly using your hands. Then, you can use the point of your chisel or the back of the putty knife to tap in the glazier's points, as shown in Figure 11. The glazier's points should sit aligned with the top edge of the pane and the shoulders should be just beneath that lip.

Apply a small amount of glazing compound on the edges of the glass that has been made and into the rabbet grooves to seal and protect them. Allow it to dry and cure completely.

Once the glazing compound has dried, you're ready to install the new window sash. First, coat the wood with a heavy coat of Linseed oil. This will prevent the newly-created putty drying out or cracking due to the moisture it absorbs. Apply the coat using a brush or the edge of your putty knife, then use the chisel, or the back end of the putty knife to gently hammer in the new sash and glazier's point into the rabbet grooves. Repeat this process at intervals of 10 inches around the frame.

Putty

A baseball thrown or a rock thrown by error or a branch falling can result in a cracked or cracked window. Most windows can be repaired easily by putting in a new 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. Before installing a replacement sash windows cost 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 gloves and safety glasses while working. You'll need a heat gun if the window is glued into the frame.

If you're planning to install the original sash, gently remove the molding pieces that are used to secure the old pane. Then sand the sash to ensure it's smooth and ready to be re-caulked. Once the sash is re-installed then, apply a new caulk made of silicone around the glass to ensure it doesn't swell or fade as time passes.

Remove the glazing points from the rabbets and the grooves in the sash that the glass is. If they're difficult to cut out, try holding the hand tool, such as a heat gun over them to soften them first. If you're using a heating gun, be careful not to damage the railings or sash by holding the tool too closely.

After the old points of glazing and putty are removed, make a bed for the new pane. Roll a piece of glazing compound between your hands, forming it into a 1/2-inch thick. Press it into the rabbets where the glass will be placed. It is essential that the Glass Replacement In Windows is positioned against the putty in all places on both sides So if you have to, lightly tap the glass into the rabbet with your thumb.

If the new pane is cracked, you can cover it with a solvent-based glass glue or silicone caulk prior to pressing it into the sash. If the crack is not sealed, you'll need to use putty to keep the water out. Once the putty is dry, wipe the oily film off of the glass and allow it to dry completely before you paint. Paint after the putty has dried completely. It won't create a solid seal and could leak or discolor with time.

Paint

You may be concerned about replacing a broken pane of glass. It's true that replacing a single pane of glass doesn't have to be expensive even if you do it your own. In fact, even a double-pane window can be replaced for less than the cost of an expert.

First, if you are working on a large window, make sure it is securely fixed to the frame. This task can be done relatively easy and quick with the proper tools and techniques.

Once you're ready to begin taking off the old window pane by removing the metal glazing points that are connected to it. These are basically small metal triangles that function as "nails" that keep the window in place within the frame of wood. They are placed beneath a layer of glazing putty that transforms into a solid molded wedge that holds the window firmly in place and conceals the window's points.

Once you have the old pane removed, clean up the surrounding frame and wood. Scrape off any paint and sand down the rabbet grooves where the glazing points were. Sand them to bare wooden surfaces so you can paint the frames the same color. 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 measure the dimensions of the window glass replacement opening. You will need 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 changes. You can take these measurements to a hardware store or home improvement shop and get 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.