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How to Replace Window Panes

A damaged window pane can be 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 lower utility costs.

You can do it yourself at only a fraction of the cost it would cost to hire an expert. It requires the right tools and only an hour or two of your time.

Glass

Replace your old single-paned windows with tempered or insulate glass to improve the efficiency of your energy, reduce noise, and protect the original character of your home's older. The majority of homeowners with basic hand tools can repair a window pane. In addition to a new pane, the following tools are needed: latex glazing putty; glazier's points; pliers; and an electric heater to warm the old putty, if needed. Before starting, put on protective gloves and goggles since working with broken glass can cause injuries.

Begin by removing any broken pieces of glass. It is best to use pliers for this, but a flathead can be useful equally. Use a wood chisel, or putty knives to remove any old putty remaining around the frame and the window sash. Be careful to not damage the window sash. Take your time and work slowly. This should be done on an elevated ladder, not on the ground. Also, you should have someone on the ground to ensure it is held steady.

Make sure that the window frame is ready to accommodate the new pane when you have removed the old glue. To allow for seasonal expansion or contraction and contraction, subtract 1/8 inch from the measurements of width and height. Take these measurements to an hardware store or home center, and have a piece of stock glass cut to size. You can also cut the glass by yourself if you possess the right tools.

After installing the new pane After installing the new pane, apply a small amount of caulking around the edge to make it weatherproof. Then, you can install a glazier's pointing on the frame's opposite side to secure the pane in the right place. The points should not be so tight as to cause friction between the sash and the frame however they shouldn't be loose.

Before applying the putty to the surface, knead thoroughly until it becomes soft and free of lumps. Roll 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 metal pieces which help to secure the glass to the frame without causing any damage to the fragile surface. Learning how to use these hidden little helpers is easy and could save you money on a professional installation or the cost of new glass.

After removing the old putty, glazier points and any remnants Clean the frame thoroughly using an utility knife. Lightly sand the frame in the rabbet grooves, if necessary, to smooth rough areas. If you do sand the wood, make sure to protect it by using painter's tape to prevent accidental damage.

Take the dimensions of the frame and write down accurate measurements. Bring these measurements to a hardware store or a home center and have the new pane made slightly smaller than the frame's opening. This will ensure a tight fit and leave room for expansion and contraction.

Place the new pane in the frame and push it in with your hands. Then, use the tip of your chisel or back end of the putty knife to make a tap on the glazier's points, as illustrated in Figure 11. When you're done, they should be in line with the top edge of the pane and the raised shoulders of the points should be just below the rabbet's rim groove.

Apply a thin layer of glazing compound on the rabbet grooves and the edges of the new glass. This will seal and protect the edges. Let it dry and cure completely.

Install the new window sash once the glazing compound has dried. First, you need to coat the wood with an even layer of linseed. This will keep the new putty from sucking up moisture and drying out and cracking with time. Apply this coat using a brush or the tip of your knife, and then employ the chisel or back end from the putty knife to gently press the new sash and glazier's point into the rabbet grooves. Repeat this procedure every 10 inches around the frame's perimeter.

Putty

A baseball thrown, a rock thrown in error or a branch falling could result in a broken or cracked window. Luckily, most windows can be replaced by simply putting a new piece in the right place. The glass is held into position by a small metal clip, called a 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 up the area with a rag and an abrasive scraper that is a pull type or a wood chisel. Wear protective glasses and gloves while you do this work. You'll require a heat gun if the window is glued into the frame.

If you plan to reinstall the original sash, gently remove any molding pieces that hold the old pane in place. Then, sand the sash to make sure it's flat and ready to be re-caulked. Once the sash is installed then, apply a new caulk made of silicone around the glass to ensure that it won't leak or discolor over time.

Remove the glazing points from the rabbets and the grooves in the sash that the glass is. If they're difficult to chisel, use a hand tool like a heat gun over them to soften first. When using a heated tool, be careful to not damage the sash or its railings.

Once the old points of glazing and putty are removed, prepare a bed for the new pane. Roll a rope with 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. The glass must be positioned against the putty on both sides. If you need to, lightly tap your glass into the rabbet with your thumb.

If the new pane has damaged, you can use the silicone caulk or glass glue based on solvents to cover the crack before pressing it into the sash. If the crack isn't sealed, you will need to apply putty to keep the water out. After the putty is dry, clean the oily film off the glass with the help of a rag. Allow it to dry completely before painting. Paint before the putty has dried completely. It will not make a strong seal and may be leaking or discoloring over time.

Paint

You may be concerned about replacing a broken pane of glass. The truth is, replacing a single piece of glass Window replacements doesn't have to be costly even if you do it your own. Even double-paned windows can be replaced for a fraction of the price it costs an expert.

If you are working with a large glass replacement window first ensure it is securely attached to the frame. With the right tools and techniques to complete this task easily and speedy.

When you're ready to start, begin by removing the old window by prying out the glazing points made of metal that are connected to it. These are small metal triangles that function as "nails" that hold the window in the frame. They are submerged beneath a layer of glazing putty that transforms into a solid molded wedge that holds the window firmly in place and conceals the edges.

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

The next step is to measure the dimensions of the window opening. It is necessary to measure the horizontal and vertical dimensions of the entire opening as well as the thickness. To determine the exact size of the new pane subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass. You can take these measurements to a hardware or home improvement shop 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 causing fogging.