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How to Replace Window Panes

A damaged replacement window seals pane could be a nuisance. This could be an opportunity to upgrade your windows to energy efficient or insulated ones to enjoy advantages like improved comfort, increased resale values and reduced utility costs.

You can do it yourself at only a fraction of the cost it would cost to employ 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 insulation glass to improve energy efficiency, cut down on noise, and protect the historic integrity of your old home. The process of replacing the window pane is simple and can be done by anyone with basic hand tools. In addition to a new pane, the following items are required for the Replacement Windows Panes process: latex glazing putty glazier's points; pliers; and an electric heater to warm the old putty, if needed. Wear safety goggles and gloves before you begin. Working with broken glass can cause serious injuries.

Begin by removing any broken pieces of glass. This is best accomplished with a pair of pliers, but a flathead screwdriver can also be used in the pinch. Utilize a wood chisel or putty knives to remove any old putty that remains around the frame and the window sash. Be careful and slow and be careful not to break the existing window handle replacement sash. It is best to work on a stable ladder rather than the ground, and to have someone standing below the sash in order to help hold it steady.

Once you have removed all of the old putty, prepare the window frame to accommodate the new pane. Take measurements of the width and height of the opening in the sash, 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 have a piece of stock glass cut to size. You can also cut the glass by yourself if you have the right tools.

After putting in the new pane After installing the new pane, apply a small amount of caulking around the edge to make it weatherproof. Then install a glazier's point on the frame's opposite side to hold the pane in its place. The points should not be too tight that they cause friction between the frame and the sash, but they should also not be loose.

Before putting the putty on, work it in a gentle manner until it is smooth and free of lumps. Then, roll it into pencil-size strips. Apply the first strip to the corner of the frame. Work from one corner to the next, making sure it is even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces of metal that help secure glass into frames for windows without scratching or damaging the fragile surface. It's easy to understand how to use this nefarious tool and you can save money on the expense of a professional installation.

After the old putty and the glazier's points have been removed, thoroughly clean the frame using a utility knife to eliminate any remaining traces. If necessary it is necessary to lightly sand the wood along the grooves of the rabbet to smooth rough areas. If you decide to sand wood, protect it with painter’s tape to avoid accidental damage.

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

Place the new pane into the frame and press it into place firmly with your hand. Then, you can use the point of your chisel or the back of the putty knife to make a tap on the glazier's points as shown in Figure 11. When you're done, they should be flush with the top edge of the pane, and the shoulders of the points should be below the lip of the rabbet groove.

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

Install the new window sash when the glazing compound has dried. First, coat the wood with a heavy coat of linseed oil. This will stop the new putty from drying out or cracking when it absorbs moisture. Apply the coating using a brush this coat, or the point of the blade. Then, use the chisel that is on the back of the putty tool or the back of the handle to gently smash the new sash or glazier's tip into the rabbet grooves. Repeat this process at intervals of 10 inches all around the frame.

Putty

A baseball thrown at you or an unintentional rock, or falling branch could cause a window to crack or break. Most windows can be repaired easily by putting in a new piece. The glass is held in place 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 get rid of the old one and clean up the area with an abrasive and an abrasive scraper that is a pull type or a wood chisel. Wear gloves and safety glasses while working. You'll need a heat gun in the event that the window is glued into the frame.

If you are planning to replace the original sash, take off the molding that holds the old pane. Then, sand the sash to ensure it's smooth and ready to be re-caulked. Once the sash is installed, apply a new silicone caulk around the glass to ensure it won't leak or discolor over time.

Take out the glazing points in the rabbets. These are the grooves on the sash, which is where the glass is located. If they're difficult to cut out, you can try holding the hand tool, such as a heat gun over them to soften them first. When using a heating tool, make sure to not scratch the sash's railings and sash.

Create a bed for your new pane after you have removed the old glaze points and putty. Roll a rope made of glazing compound between your fingers and make it around 1/2 inch thick. Then, you can press it into the rabbets in which the glass will sit. It's important that the glass is positioned against the putty in all places on each side, so if you need to do so, gently tap the glass into the rabbet using your thumb.

If the new pane is cracked, you can use a silicone caulk or a glass glue made from solvents to fill in the crack before pressing it into the sash. If not, you'll have to apply putty on the crack to create an impervious seal to keep water out. After the putty is dry and the film is oily, wipe it off the glass with a rag and allow it to completely dry before painting. If you paint before the putty has completely dry, it won't form an effective seal and could discolor or leak over time.

Paint

You may be concerned about replacing a broken pane of glass. It's true that replacing a single pane of glass doesn't need to be costly when you do it on your own. Even double-paned windows can be replaced at a fraction of the cost it will cost for a professional.

First, if you are working on a large-sized window, make sure it is securely attached to the frame. This task can be made relatively simple and fast using the right tools and techniques.

When you are ready to start taking down the old window pane. Remove the glazing points made of metal that are attached to it. They are basically tiny metal triangles that function as "nails" that keep the window in within the frame of wood. They are placed under a bead or glazing glue that hardens to solid wedge which holds the wood frame in place and conceals the edges.

After you have the old pane taken away clean the surrounding frame and wood. Scrape off any paint and sand down the rabbet grooves where the glazing points were. These should be sanded down to the point of being bare, so that you can paint them the same shade as the rest of the frame. After sanding, apply a layer of flax oil on the wood's surface to extend the life of the frame.

Then, take measurements of the dimensions of the window's opening. You will need to measure the vertical and horizontal 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 also allow for expansion and contraction of the glass in times of seasonal changes. Take these dimensions to the hardware or home improvement store, and they will have cut the glass 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.