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How to Replace Window Panes

A cracked window pane is an issue. This can be an opportunity to upgrade to energy-efficient windows or insulated ones and enjoy benefits such as improved comfort, increased resale value and reduced utility costs.

It's a task you can do 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

If your single-pane windows are old broken, deteriorating or damaged replacing them with modern glass that is tempered or insulated can increase energy efficiency and reduce noise while also preserving the original character of older homes. A majority of homeowners with hand tools can replace window pane the window pane. In addition to a replacement pane, the following items are required: latex glazing putty; glazier's points; pliers; and a heat gun for warming the old putty, if needed. Before beginning, wear 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 however a flathead could be useful as well. Then, use a wood chisel, or putty knife, to take the remainder of the old putty around the frame and the sash. Be careful to not break the window sash. Take your time and work slowly. It is a good idea to work on a sturdy ladder rather than on the ground, and to have someone standing below the sash in order to help hold it steady.

Once you've removed all the old putty, prepare the window frame to accommodate the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of width and height. Take these measurements to the nearest hardware store or home center and get a piece of stock glass cut to size. You can also cut the glass yourself if have the right tools.

After putting in the new pane, run a small bead of caulking along the edge to seal it against weather. Then, place a glazier's tip on each side of the frame to secure the pane into its place. The points shouldn't be too tight as to cause friction between the sash and frame however they shouldn't be too loose.

Before applying the putty to the surface, you must knead it thoroughly until it is soft and free from lumps. Roll it into pencil-sized strips. Apply the first strip to the corner of the frame, working from one corner to the other to ensure it is smooth and even.

Glazier's Points

The glazier's points are the tiny triangular pieces of steel that allow glass to be secured into a window frame without scratching or damaging the delicate surface. It's easy to understand how to use this hidden tool, and you'll save money on the cost of an installation by a professional.

After taking off the old putty, glazier points, and any other leftovers 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, be sure to protect it by using painter's tape to prevent accidental damage.

Write down the dimensions of the frame. Bring 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.

Place the new pane in the frame and press it into place firmly by using your hands. Then use the point of your chisel, upvc Replacement window handles or the back of the putty knife to make a tap on the glazier's points as illustrated in Figure 11. The glazier's points should be in line with the top edge of your pane and the raised shoulders should be just below the lip.

Apply a thin layer glazing compound to the rabbet grooves as well as the edges of new glass. This will protect and seal the edges. Let it dry and cure fully.

Install the new window sash after the glazing compound has dried. First, saturate the wood with a heavy coat of linseed oil. This will prevent the new putty from drying out and cracking due to the moisture it absorbs. Apply the coating using a brush this coat, or the tip of the blade. Then, use the chisel that is on the back of the tool or the back of the putty handle to gently hammer 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 a rock that is errant or a falling branch can cause a window to break or crack. Most windows can be replaced easily by installing a new piece. The glass is held in position by a small metal clip, also known as a glazier's point and putty. This compound is also referred to as glazing compound. Remove the old pane and clean the area with an abrasive, scraper that is a pull type or a wood chisel. Wear gloves and safety glasses while working. If the window is secured to the frame, you'll need to employ a heat gun in order to soften the adhesive before taking it off.

If you are planning to reinstall your original sash, remove the molding that holds the old pane. Then, sand the sash to ensure it's level and ready for a new caulk. After the sash has been installed, you can apply a silicone caulk over the glass. This will ensure that it doesn't leak over time or discolor.

Remove the glazing points from the rabbets, or the grooves in the sash, where the glass sits. If they're hard to cut, place the hand tool, such as a heating gun over them for a few minutes to soften them. If you're using a heating gun, be cautious not to damage the railings of the sash or the sash itself by holding the tool too tightly.

Once the old glazing points and replace window Pane putty have been removed, make a bed for the new pane. Roll a rope of glazing compound between your hands, and form it to be around 1/2-inch thick. Then, push it into the rabbets where the glass will rest. The glass must rest against the putty on both sides. If necessary you want to tap your glass lightly into the rabbet using your thumb.

If the new pane is cracked, you can cover it with a solvent-based glass glue or silicone caulk before pressing it into the sash. If the crack is not sealed, you'll need to use putty to keep water out. After the putty has dried clean the oily film off the glass and let it dry completely before painting. Paint after the putty has dried completely. It will not make a strong seal and may be leaking or discoloring over time.

Paint

If you've had a broken window pane, you may be worried about the cost of replacing it. It's true that replacing a single pane of glass doesn't need to be costly even if you do it your own. Even double-paned windows can be replaced for a fraction of what it costs a professional.

First, if you're working on a large window, ensure that it is securely fixed to the frame. With the right tools and techniques to complete this task easily and fast.

When you are ready to begin with the removal of the window pane. Take out the metal glazing points attached to it. These are tiny metal triangles which act as "nails" to hold the window within the frame. They are buried under a bead of glazing putty that is then cured to form a solid, molded wedge that holds the window firmly in place and hides the points.

Once you have the old pane taken away clean the surrounding frame and wood. Scrape off any paint that has been used and sand the rabbet grooves in which the glazing points were placed. Sand them to bare wooden surfaces so you can paint the frames the same color. After sanding the wood then apply a layer of flax oil. This will help extend its life.

Next, measure the width of the window handles replacement's opening. It is necessary to measure the horizontal and vertical 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. Bring these measurements to the 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 causing fogging.