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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 to reap benefits like greater comfort, a higher potential for resales, and less bills.

It's a task you can do yourself for a fraction of the cost of hiring a professional. You'll need only the appropriate tools and a few minutes of your time.

Glass

If your single pane windows are old, deteriorating or broken replacing them with modern glass that is tempered or insulated can increase energy efficiency and decrease noise while maintaining the historical integrity of older homes. The replacement window of the window pane is simple and can be done by homeowners with basic hand tools. In addition to a new pane, the following items are needed 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 may cause injuries.

Take away any broken glass pieces remaining. This can be done with pliers, though using a flathead screwdriver may work in a pinch. Make use of a wood chisel or putty knife to get rid of any old putty that remains around the frame and window sash. Take your time and work slowly and be careful not to break the existing window sash. It is a good idea to work on a sturdy ladder rather than on the ground and place someone on the sash to help keep it steady.

Once you have removed all of the old putty, it is time to prepare the window frame to fit the new pane. Take measurements of the width and height of the opening for the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Bring these measurements to an hardware store or home center and have a piece of stock glass cut to size. Alternately, you can cut the glass yourself if you have the right tools.

After putting in the new pane, run a small bead of caulking around the edge to seal it against weather. Install a glazier's pointing on both sides of the frame. This will help secure the pane. The points shouldn't be too tight as to cause friction between the sash and frame however they should not be too loose.

Before applying the putty, make sure to knead it until it's soft and free of lumps. Make it into pencil-sized strips. Apply the first strip to the corner of the frame, working from one corner to another so that it is smooth and even.

Glazier's Points

The glazier's points are small triangular pieces of steel which help to secure the glass into the window frame without damaging the delicate surface. Knowing how to use these hidden tiny pieces of help is simple and could save you money on a professional installation or the cost of purchasing new glass.

Once the old putty and the glazier's points have been removed, thoroughly clean the frame using a utility knife to remove any remaining residue. If needed it is necessary to lightly sand the wood along the grooves of the rabbets to smooth rough spots. 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. These measurements can be taken to the hardware or home center store, and the new frame will be cut to a smaller size. This will ensure that the pane fits snugly and allows for expansion and contraction.

Place the new window in the frame and press it in place with your hand. Then use the point of your chisel or back end of the putty knife to tap in the glazier's points, as illustrated in Figure 11. When you're done taping, they should be in line with the top edge of the pane and the raised shoulders of the points should be below the rabbet's lip. groove.

Apply a thin bead of glazing compound over the edges of the new glass and in the rabbet grooves, to seal and protect them. Allow it to dry and cure fully.

After the glazing compound dries and the glazing compound is dry, you can install the new window sash. First, saturate the wood with a heavy coat of linseed oil. This will stop the new putty from soaking in the moisture and drying out and cracking with time. Apply this coat using a brush or the tip of your putty knife, and then employ the chisel or back end from the putty knife to gently press 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 hurled baseball or an unintentional rock, or falling branch could cause a window to break or crack. Most windows can be repaired easily by installing a new piece. The glass is held in place with tiny metal clips known as the glazier's pointed and putty, often called glazing compound. Before installing a new pane, first take out the old one and clean the area using an abrasive and the pull-type paint scraper or a wood chisel. Wear protective glasses and gloves while you do this work. If the window is secured to the frame, you'll need make use of a heat gun to soften the adhesive before taking it off.

If you're planning to install the original sash, take off the molding that holds the old pane. Then sand the sash to make sure it's flat and ready to be re-caulked. Once the sash is installed, apply a new silicone caulk to the glass to ensure that it doesn't swell or fade in time.

Remove the glazing points from the rabbets, or the grooves in the sash where the glass sits. If they're hard to chisel, use the hand tool, such as a heatgun over them for a few minutes to soften them. If you're using a heat gun, make sure not to cause damage to the sash or its railings by holding the tool too closely.

Create a bed for your new pane by removing the old glaze points and putty. Roll a piece 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 be. It is essential that the glass is positioned against the putty in all places on each side If you have to tap it, gently press the glass into the rabbet using your thumb.

If the new pane is cracked, you can use a silicone caulk or glass glue that is based on solvents to fill in the crack prior to pressing it into the sash. If not, you'll have to apply putty on the crack to form an impervious seal to keep water out. After the putty has dried, clean the oily film off the glass using an abrasive and allow it to completely dry before painting. If you paint before the putty is completely dry, it won't create a solid seal and could discolor or leak over time.

Paint

You might be worried about replacing a damaged piece of glass. But the truth is that replacing a single glass pane doesn't have to break the bank when you do it yourself. Even double-paned windows Seal Replacement can be replaced for a fraction of the price it costs an expert.

First, if you are working on a large-sized window, make sure that it is securely attached to the frame. With the right tools and techniques, you can make this task relatively easy and fast.

When you are ready to start taking down the old window pane. Pry out the glazing points made of metal that are attached to it. These are basically small metal triangles that act as "nails" that keep the window in place in the wood frame. They are placed beneath a layer of glazing putty that transforms into a solid molded wedge that secures the window in place and hides the edges.

Once you have the old pane taken away Clean up the frame and wood. Scrape away any paint and sand down the rabbet grooves where the glazing points were. These should be sanded down to the point of being bare, so that you can paint them the same shade as the rest of the frame. After sanding, apply a coat of flax oil to the wood's surface to help extend its lifespan.

Then, take measurements of the dimensions of the window 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 get the exact measurement for the new pane. This will also allow for expansion and contraction of the glass during seasons of change. You can bring 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.