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How to Replace Window Panes

A cracked window cost replacement pane is a nuisance. This can be an opportunity to upgrade your windows to energy efficient or insulated ones, and reap advantages like improved comfort, increased resale values and lower utility costs.

You can do it yourself at a fraction of what it would cost to hire an expert. You'll need only the appropriate tools and a few hours of your time.

Glass

If your single-pane windows are old, deteriorating or broken replacing them with modern glass that is tempered or insulated will improve energy efficiency and reduce noise while also preserving the historic integrity of older homes. The replacement windows of a window pane is relatively easy and can be completed by anyone with basic hand tools. You will also need a replacement window pane, glazier's tips pliers, and latex glazing putty. If necessary you may make use of a heat gun to warm the old putty. Wear safety glasses and gloves prior to beginning. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. It is best to use pliers however a flathead could be used equally. Make use of a wood chisel or putty knives to remove any old putty remaining around the frame and window sash. Be careful to not scratch the window sash. Be careful and slow. This should be done on a ladder, not the ground. Also, have someone lower to keep it in place.

Make sure that the window frame is ready to accommodate the new pane when you have removed the old glue. Measure the width and height of the opening for the sash by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Take these measurements to the nearest hardware store or home center, and find a piece glass cut to size. Alternately, you can cut the glass yourself if have the tools you need.

After installing the new glass Apply caulking on the edges. This will make the glass weatherproof. Then install a glazier's point on the frame's opposite side to hold the pane in the right place. The points should not be so tight as to cause friction between the frame and sash, but they also shouldn't be too loose.

Before putting the putty on, make sure to knead it until it is soft and free of lumps. Then make it into pencil-sized strips. The first strip should be placed in the corner of the frame, working from one corner to the other to ensure it is even and smooth.

Glazier's Points

The glazier's points are tiny triangular pieces of steel that help secure glass into frames for windows without scratching or damaging the delicate surface. It's simple to learn how to use this hidden tool and you can save money on the cost of an installation by a professional.

After removing the old putty, glazier points, and any other leftovers, clean the frame thoroughly with an utility knife. If necessary you can lightly sand the wood along the rabbet grooves to smooth rough areas. If you do sand the wood, be sure to protect it with painter's tape to avoid accidental damage.

Measure the empty frame's dimensions and note down precise measurements. Bring these measurements to a hardware store or a home center and have the new pane cut smaller than the frame's opening. This will ensure a secure fit and leave room for expansion and contraction.

Place the new pane into the frame and press it down using your hands. Make use of the chisel's point, or the back of the putty blade to smudge the glazier's points as shown in Figure 11. The glazier's points should sit in line with the top edge of the pane and the shoulders should be just below that lip.

Apply a thin layer of glazing compound on the edges of the glass that has been made and into the rabbet grooves to seal and protect them. Let it dry and cure completely.

After the glazing compound dries it's time to put in the new window sash. First, you need to coat the wood with a thick layer of linseed. This will prevent the new putty from sucking up the moisture and drying out and cracking over time. Apply this coat with a brush or the tip of your putty knife, then use the chisel, or the back end from the putty knife to gently hammer in the new sash and glazier's points into the rabbet grooves. Repeat this process every 10 inches around the frame's perimeter.

Putty

A baseball that is thrown or an unintentional rock, or falling branch could cause a window to crack or break. Fortunately, windows can be repaired by simply putting a brand new piece of glass in its the proper place. The glass is held into the position with a tiny 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 when working. You'll need a heating gun when the window is fixed to the frame.

If you're planning to install the original sash, gently remove the molding pieces that secure the old pane. Sand the sash until it's flat and ready to receive new caulk. Once the sash is re-installed, apply a new caulk made of silicone around the glass to ensure it will not leak or change color over time.

Remove the glazing points from the rabbets, or the grooves in the sash, where the glass sits. If they're difficult to cut out, you can try holding a hand tool like a heat gun over them to soften them before you do. When using a heating tool, make sure to not scratch the sash's railings and sash.

Prepare the bed for your new pane after you have removed the old putty and glazing points. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Then, press it into the rabbets, where the glass will be. It's important that the glass rests against the putty in all places on both sides So if you have to, lightly tap the glass into the rabbet with your thumb.

If the new pane has cracked, you can apply a silicone caulk or glass replacement window glue made from solvents to fill in the crack prior to pressing it into the sash window replacement. If the crack is not sealed, you'll require putty to keep water out. After the putty has dried, clean the oily film off the glass with a rag and allow it to dry completely prior to painting. If you paint before the putty has completely dry, it won't form a solid seal and could leak or discolor over time.

Paint

If you've experienced a broken window pane, you might be worried about the expense of replacing it. The truth is, replacing a single pane glass doesn't need to be expensive if you do it on your own. Even a double-paned window could be replaced at a fraction of the cost it costs an expert.

If you are working on a large-sized window, make sure it is securely fastened to the frame. This job can be done relatively easy and fast with the appropriate tools and techniques.

When you're ready to start, begin by removing the old window by prying out the metal glazing points that are connected to it. These are essentially small metal triangles which function as "nails" that hold the window in place within the frame of wood. They are buried beneath a glaze putty or bead that sets to form solid wedge that holds the frame firmly in position and hides the sharp edges.

Once you have the old pane removed Clean up the 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 with the same shade. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

The next step is to measure 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. To determine the exact dimensions of the new pane, subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass. Take these measurements to your local hardware or home improvement store and ask them to cut you a piece 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.