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How to Replace Window Panes

A cracked window pane is a nuisance. This could be an opportunity to upgrade your windows to energy efficient or insulated ones to enjoy benefits such as improved comfort, increased resale value and reduced utility bills.

It's a project you can do 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 old, deteriorating or broken replacing them with modern glass that is tempered or insulated will increase energy efficiency and decrease noise while also preserving the historic integrity of older homes. The process of replacing a window pane is relatively easy and can be accomplished by most homeowners who possess basic hand tools. In addition to a replacement pane, the following tools are required such as latex glazing putty; Glazier's points; pliers and the use of a heat gun to warm the old putty, if needed. Wear safety goggles and gloves before you begin. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers for this however a flathead could be used as well. Then, use a wood chisel or putty knife to take the remainder of the old putty from the frame and sash. Be careful to not break the window sash. Be careful and slow. This is best done on an elevated ladder, not on the ground. Also, ensure that someone below the sash ensure it is held steady.

Make sure that the window frame is ready to accept the new pane once you have removed the old glue. Find the width and the height of the sash opening and subtract 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 get a piece of stock glass cut to size. You can cut the glass windows replacement (see this) yourself if you have the right tools.

After installing the new pane after installing the new pane, put a tiny amount of caulking around the edges to ensure it is weatherproof. Install a glazier’s point on both sides of the frame. This will help secure the pane. The points shouldn't be so tight that they cause friction between the frame and sash, but they should also not be loose.

Before applying the putty on the surface, knead thoroughly until it becomes soft and free from lumps. Then make it into pencil-sized strips. Place the first strip in the corner of the frame, working from one corner to the other so that it is smooth and even.

Glazier's Points

The glazier’s points are small triangular pieces of metal that allow glass to be secured to the frame without causing damage to the delicate surface. It's easy to understand how to use this hidden tool, and you'll be able to save money on the expense of an installation by a professional.

After removing the old putty, glazier points, and any other remnants, clean the frame thoroughly using an utility knife. If necessary it is necessary to lightly sand the wood along the rabbet grooves to smooth out rough spots. If you decide to sand wood, protect it with painter's tape to prevent accidental damage.

Write down the exact dimensions of the frame. These dimensions can be taken to the hardware or home center store, and the new frame will be cut slightly smaller. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Place the new pane in the frame and press it down using your hands. Then use the point of your chisel or back end of the putty knife to make a tap on the glazier's points as illustrated in Figure 11. The glazier's point should be in line 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 edges of new glass. This will protect and seal the edges. Let it dry and cure completely.

Once the glazing compound has dried it's time to put in the new window sash. The first step is to coat the wood with an even layer of linseed. This will prevent the new putty from drying out or cracking as it absorbs moisture. Use a brush to apply this coat, or even the tip of the putty blade. Then use the chisel that is on the back of the tool or the back of the handle to gently hit the new sash, or glazier's point into rabbet grooves. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball hit, a rock thrown in error or a branch falling could result in a broken or cracked window. Fortunately, windows can be easily replaced by simply putting a new piece in the right place. The glass is held in place by a small metal clip, referred to as the glazier's point, and putty. This compound is also called glazing compound. Before installing a new pane, first take out the old one and clean the area with the help of a rag, a pull-type paint scraper or a wood chisel. Wear gloves and safety glasses while working. If the window is secured to the frame, you'll need employ a heat gun in order to soften the adhesive prior to prying it free.

If you're planning to replace the original sash, take off the molding that holds the old pane. Then you can sand the sash down to ensure it's level and ready for a new caulk. After the sash has been put back in place it is possible to apply a silicone caulk over 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 in the sash, where the glass is. If they are hard to chisel, use the hand tool, such as a heatgun over them to soften first. When using a heating tool, make sure to not scratch the sash's railings and sash.

Once the old glaze points and putty have been removed, prepare a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Press it into the rabbets where the glass will be placed. It is crucial that the glass is positioned against the putty in all places on both sides, so if you need to do so, gently tap the glass into the rabbet with your thumb.

If the new pane has cracked, you can use the silicone caulk or glass glue that is based on solvents to seal the crack before pressing it in the sash. If not, you'll have to apply putty over the crack to form an airtight seal and keep water out. Once the putty is dry, wipe 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 won't create a solid seal and could leak or discolor over time.

Paint

If you've had a broken window pane, you might be concerned about the expense of replacing it. In reality, replacing a single pane glass doesn't need to be costly even if you do it your own. In fact, even a double-pane window can be replaced for only a fraction of the cost of an expert.

If you are working on a large window, make sure that it is securely attached to the frame. With the right tools and techniques to make this task relatively easy and quick.

When you are ready to start taking down the old window pane. Pry out the metal glazing points attached to it. These are essentially small metal triangles which function as "nails" which hold the window in place within the frame of wood. They are placed under a bead of glazing putty that is then cured to form a solid, moulded wedge that holds the window firmly in place and hides the window's points.

Once you have the old pane taken away Clean up the frame and wood. Scrape off any old paint and sand the rabbet grooves where the glazing points were placed. Sand them to bare wooden surfaces, allowing you to paint the frames the same color. After sanding, apply a layer of flax oil on the wood that is not sanded down to extend the life of the frame.

Then, you need to measure the size 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 you have the exact size for the new pane. This will also allow for expansion and replacement Windows contraction of the glass in times of seasonal changes. You can take these measurements to a hardware 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.