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How to Replace Window Panes

A damaged or cracked window can cause a lot of trouble. It can also be an opportunity to upgrade your glass to energy-efficient or insulated windows, and enjoy benefits such as more comfort, higher the value of resales and lower utility costs.

You can do it yourself for a less than what it would cost to hire an expert. You'll only require the right tools and a few hours of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged replacing them with more modern glass that is tempered or insulated will increase energy efficiency and reduce noise while also preserving the original character of older homes. The majority of homeowners with basic hand tools can repair the window pane. You will also need a replacement glass for windows window pane, glazier's tips, pliers, and latex glaze putty. If you need to, you can use a heatgun to warm the old putty. Before starting, put on protective gloves and goggles since working with broken glass could cause injuries.

Take out any broken glass pieces that remain. It is best to use pliers however a flathead could be used equally. After that, use a wood chisel or putty knife remove the remaining old putty from around the frame and the sash. Be careful to not scratch the window sash. Be careful and slow. This can be done best on a ladder, not the ground. Also, have someone lower to keep it in place.

Prepare the window frame to accommodate the new pane once you have removed the old putty. Measure the width and height of the opening in 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 get a piece of stock glass cut to size. You can cut the glass yourself if you possess the appropriate tools.

After installing the new glass, apply a small amount of caulking on the edges. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will secure the pane. The points should not be so tight as to cause friction between the sash and the frame however they shouldn't be too loose.

Before applying the putty on the surface, you must knead it thoroughly until it becomes soft and free of lumps. Then you can roll it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from one corner to another to ensure it's even and smooth.

Glazier's Points

The glazier's facets are small triangular pieces that allow glass to be secured into frames for windows without scratching or damaging the fragile surface. It's easy to understand how to use this secret tool and you can save money on the cost of an installation by a professional.

After the old putty and glazier's points are removed, thoroughly clean the frame using a utility knife to remove any remaining residue. If necessary it is necessary to lightly sand the wood in the grooves of the rabbet to smooth rough spots. If you sand wood, replace window pane protect it with painter’s tape to prevent accidental damage.

Note down the dimensions of the frame. Take these dimensions to an hardware store or home center and request that the new pane cut smaller than the frame's opening. This will ensure a tight fit and will allow room for expansion and contraction.

Place the new pane in the frame and push it in place by using your hands. Utilize the chisel's point, or the back of the putty knife to tap the glazier's points as illustrated in Figure 11. The glazier's points should sit flush against the top edge of your pane, and the shoulders raised should be just beneath that lip.

Apply a thin bead of glazing compound on the edges of the new glass and into the rabbet grooves to seal and protect them. Let it dry and cure completely.

Install the new window sash when the glazing compound has dried. First, coat the wood with a thick layer of linseed. This will stop the new putty from soaking up moisture and drying out and cracking over time. Apply this coat using a brush or the tip of your putty knife, and then use the chisel or the back end of the putty knife to gently hammer the new sash and glazier's points into the grooves of the rabbet. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball thrown at you or a rock that is errant or a fallen branch can cause a window to break or crack. Most windows can be replaced by simply putting in a fresh piece. The glass is held in place using small clips made of metal called a glazier's point and putty, which is often 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 safety glasses and gloves while working. You'll need a heat gun if the window is glued to the frame.

If you're planning to Replace window pane your original sash, remove the molding that supports the old pane. Then you can sand the sash down to ensure it's level and replace window pane ready for new caulk. After the sash has been re-installed, apply a new silicone caulk around the glass to ensure it won't leak or discolor in time.

Remove the glazing points from the rabbets. These are the grooves on the sash, where the glass is. If they're difficult to cut out, you can try holding a hand tool like a heat gun 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 holding the tool too closely.

Prepare the bed for your new pane after you have removed the old putty and glazing points. Roll a piece of glazing compound between your hands, forming it to be around 1/2-inch thick. Then, push it into the rabbets in which the glass will be. The glass must rest against the putty on both sides. If needed you want to tap your glass lightly into the rabbet using your thumb.

If the new pane has cracked, you can apply a silicone caulk or a glass glue that is based on solvents to cover the crack prior to pressing it in the sash. If the crack is not sealed, you'll require putty to keep the water out. After the putty has dried clean the oily film off of the glass and allow it to dry completely before you paint. If you paint before the putty has completely dry, it won't create an effective seal and could be leaking or discoloring over time.

Paint

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

If you are working with large glass windows first ensure it is securely fixed to the frame. This job is relatively easy and fast with the appropriate tools and techniques.

If you're ready to begin with the removal of the old window pane by prying out the glazing points made of metal that are connected to it. These are small metal triangles that function as "nails", holding the window in the frame. They are buried under a bead of glazing putty, which transforms into a solid formed wedge that holds the window handle replacement firmly in place and conceals the edges.

After you have 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 were. Sand them down to bare wood surfaces, so that you can paint the frames with the same color. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

Then, take measurements of the dimensions of the window's opening. You will need to measure the horizontal and vertical dimensions of the entire opening as well as the thickness. To get the exact size of the new pane, subtract 1/8 inch from both measurements. This will also allow for expansion and contraction of the glass during seasonal changes. Take these measurements to your local hardware or home improvement store and ask them to cut you 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.