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How to Replace Window Panes

A cracked window pane is a nuisance. It could also be a chance to upgrade your glass to energy efficient or insulated windows, and enjoy benefits such as improved comfort, increased potential for resales, and less bills.

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

Glass

Replace your old single-paned windows using tempered or insulation glass to improve energy efficiency, reduce noise, and preserve the historical integrity of your home's older. The replacement window seals of 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 components are required such as latex glazing putty; glazier's points; pliers; and a heat gun for warming the old putty, if necessary. Before starting, wear gloves and safety goggles as working with broken glass could cause injuries.

Begin by removing any broken pieces of glass. It is recommended to use pliers, but a flathead can be useful equally. Then, use a wooden chisel or putty knife remove the rest of the old putty around the frame and sash. Be careful to not break the window sash. Work slowly and carefully. This is best done on a ladder, not on the ground. Also, ensure that someone lower to ensure it is held steady.

Once you have removed all of the old putty, prepare the window frame to fit the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. These measurements can be sent to an hardware or home centers store to have a piece cut of glass stock to the proper size. You can cut the glass yourself if you possess the right tools.

After installing the new pane, run a small bead of caulking around the edge to seal it against weather. Install a glazier’s point on both sides of the frame. This will ensure the pane. The points shouldn't be too tight that they create friction between the sash and the frame however they shouldn't be loose.

Before applying the putty on the surface, you must knead it 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 corner to corner to ensure it's even and smooth.

Glazier's Points

The glazier's points are tiny triangular metal pieces that allow glass to be secured to the frame without damaging the delicate surface. It's easy to learn how to use this hidden tool and you can save money on the expense of an installation by a professional.

Once the old putty and glazier's points are removed, thoroughly clean the frame using a utility knife to get rid of any remaining traces. Lightly sand the frame in the rabbet grooves, if necessary, to smooth 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. Take these measurements to an hardware store or home center and have the new pane cut slightly smaller than the frame's opening. 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 use the point of your chisel or the back end of the putty knife to pierce the glazier's facets, as illustrated in Figure 11. After you're done, the points 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 layer glazing compound to the rabbet grooves and the edges of the glass. This will seal and protect the edges. Allow this to dry and cure fully.

Install the new window sash after the glazing compound has dried. 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 due to the moisture it absorbs. Use a brush to apply this coat, or the point of the 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 grooves of the rabbet. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball that is thrown or an unintentional rock, or a fallen branch can cause a window to crack or break. Fortunately, the majority of windows can be repaired by simply putting a brand new piece in the proper place. The glass Window replacement is held in place using small clips made of metal called the glazier's pointed and putty, also called glazing compound. Remove the old pane and clean the area with the rag, a scraper that is a pull type or a wood chisel. Wear gloves and safety glasses when you work. If the window is attached to the frame, you'll have to make use of a heat gun to soften the adhesive prior to taking it off.

If you're planning to reinstall your original sash, you must remove the molding that supports the old pane. Then, sand the sash to ensure it's level and ready to be re-caulked. After the sash has been re-installed, apply a new silicone caulk around the glass to ensure that it doesn't swell or fade over time.

Remove the glazing points from the rabbets, the grooves in the sash, where the glass is. If they're difficult to work out, you can try holding an instrument like a heat gun over them to soften them up first. If you're using a heated gun, be cautious not to cause damage to the railings of the sash or the sash itself by placing the tool too closely.

Create the bed for your new pane after removing the old glaze points and putty. Roll a rope made of glazing compound between your fingers and then make it about 1/2 inch thick. Press it into the rabbets, where the glass will be placed. It is crucial that the glass sits on the putty on each side, so if you need to tap it, gently press the glass into the rabbet with your thumb.

If the new pane has damaged, you can use a silicone caulk or a glass glue made from solvents to seal the crack prior to pressing it into the sash. In other cases, you'll need to apply putty over the crack to form an impervious seal to keep water out. After the putty has dried clean the oily film off of the glass and let it dry completely before painting. If you paint before the putty is fully dry, it won't form a solid seal and could be leaking or discoloring over time.

Paint

You may be concerned about replacing a damaged piece of glass. It's true that replacing a single pane glass doesn't have to be costly if you do it on your own. In fact windows with double panes can be replaced for less than the cost of a professional.

If you are working on a large-sized window, ensure that it is securely fixed to the frame. This job can be made relatively simple and fast with the appropriate tools and techniques.

When you are ready to begin taking down the old window pane. Pry out the glazing points made of metal that are attached to it. They are basically tiny metal triangles which function as "nails" that keep the window in within the frame of wood. They are placed under a glaze putty or bead which hardens into an unbreakable wedge that holds the wood frame firmly in position and hides the points.

After you have removed the old pane removed clean the surrounding frame and wood. Scrape away any old paint and sand down the rabbet grooves, where the glazing points used to be. They should be sanded to the point of being bare, so that you can paint them the same shade as the rest of the frame. After sanding the wood then apply a layer of flax oil. This will help prolong the life of the frame.

Then, take measurements of the dimensions of the window's opening. You'll need to determine 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 allow for seasonal changes in the glass. You can bring these measurements to a hardware 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 glass Window replacement causing fogging.