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How to Replace Window Panes

A damaged window pane can be a nuisance. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows to benefit from more comfort, higher resale value and reduced utility bills.

You can do it yourself at less than what it would cost to employ an expert. It requires the right tools and an hour or two of your time.

Glass

replace window pane your single-paned windows with tempered insulation glass to improve energy efficiency, cut down on noise, and maintain the historic integrity of your old home. Most homeowners with basic hand tools can replace windows with ease. You will also require an additional window pane, glazier's tips pliers, and latex glaze putty. If needed you can use a heatgun to warm the old putty. Before starting, wear gloves and safety goggles as working with broken glass can cause injuries.

Begin by removing any broken pieces of glass. This is best accomplished with pliers, but a flathead screwdriver can also be effective in a pinch. Then, use a wooden chisel or putty knife to take the remainder of the old putty from the frame and sash. Be careful not to break the window sash. Take your time and work slowly. This should be done on a ladder, not on the ground. Also, you should have someone below the sash keep it in place.

Once you have removed all of the old putty, prepare the window frame to fit the new pane. Find the width and the height of the sash opening by subtracting 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. Alternately, you can cut the glass yourself if you have the appropriate tools.

After putting in the new pane after installing the new pane, put a tiny amount of caulking around the edges to seal it against weather. Install a glazier’s point on both sides of the frame. This will secure the pane. The points should not be so tight that they create friction between the sash and the frame however they should not be too loose.

Before applying the putty to the surface, you must knead it thoroughly until it is smooth and free from lumps. Make it into pencil-sized strips. The first strip should be glued to the corner of the frame. Work from one corner to the next to ensure it's even and smooth.

Glazier's Points

The glazier's points are tiny triangular pieces of steel that allow glass to be secured into the window frame without damaging the delicate surface. It's simple to learn how to use this secret tool, and you'll save money on the expense of a professional installation.

After getting rid of the old putty glazier points, and any other residue, clean the frame thoroughly using a utility knife. If necessary, lightly sand the wood along the grooves of the rabbet to smooth out rough areas. If you do sand your wood, make sure to protect it with painter's tape to avoid accidental damage.

Note down the exact dimensions of the frame. These measurements can be brought to the hardware or home center store, and the new pane will be cut slightly smaller. This will ensure a secure fit and leave room for expansion and contraction.

Place the new window in the frame and press it into place firmly with your hand. Use the point of the chisel or the edge of the putty blade to tap in the glaziers' points as shown in Figure 11. After you're done, the points should be level with the top edge of the pane and the raised shoulders of the points should be below the rabbet's rim groove.

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

Install the new window sash after the glazing compound has dried. First, coat the wood with an even layer of linseed. This will keep the new putty from taking up moisture and drying out and cracking with time. Use a brush to apply this coat, or the point of the blade. Then use the chisel on the back of the tool or the back of the handle to gently smash the new sash or glazier's point into rabbet grooves. Repeat this procedure every 10 inches along the frame's perimeter.

Putty

A baseball that is thrown or Replace window pane a rock that is errant or a fallen branch can cause a window pane to break or crack. Luckily, most windows can be easily replaced by simply putting a 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 using the rag, a pull-type scraper or wood chisel. Wear protective glasses and gloves while working. If the window is attached to the frame, you'll have to make use of a heat gun to soften the adhesive before cutting it loose.

If you are planning to install your original sash, remove the mold 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 get soiled or discolor over time.

Remove the glazing points from the rabbets, or the grooves in the sash that the glass is. If they're difficult to cut out, try placing an instrument like a heat gun over them to soften them first. If you're using a heating gun, be careful not to scratch the sash or its railings by using the tool too closely.

Create a bed for your new pane after you have removed the old glaze and putty. Roll a rope of glazing compound between your hands, forming it to be about 1/2-inch thick. Then, you can press it into the rabbets, where the glass will sit. It's important that the glass is positioned against the putty in all places on each side If you have to do so, gently tap the glass into the rabbet with your thumb.

If the new pane is cracked, you can cover it with a solvent-based glue or silicone caulk prior pressing it into the sash. In other cases, you'll need to apply putty on the crack to create an impervious seal to keep water out. Once the putty is dry, wipe the oily film off the glass and allow it to dry completely before painting. If you paint before the putty is fully dry, it won't create an effective seal and could discolor or leak in time.

Paint

You might be worried about replacing a broken piece of glass. It's true that replacing a single piece of glass doesn't need to be expensive if you do it on your own. Even double glazed window replacement-paned windows can be replaced for a fraction of the price it will cost an expert.

If you're working with large glass windows, first make sure it is securely fixed to the frame. Using the proper tools and techniques, you can accomplish this task fairly easily and fast.

When you are ready to begin, remove the old window pane. Pry out the metal glazing points attached to it. They are basically tiny metal triangles that act as "nails" which hold the window in place within the frame of wood. They are placed under a bead of glazing putty, which transforms into a solid molded wedge that secures the window in place and hides the points.

After removal of the old pane clean the frame and the wood. Scrape off any paint and sand down the rabbet grooves, where the glazing points used to be. Sand them down to clean wood surfaces, so that you can paint the frames with the same shade. After the sanding process, apply a coat of flax oil to the wood's surface to prolong its life.

Next, measure the width of the window 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 also allow for expansion and contraction of the glass during seasonal change. Take these dimensions to your local 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.