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How to Replace Window Panes

A damaged or cracked window is a nuisance. It could be a chance to upgrade your windows to energy efficient or insulated ones, and reap benefits like increased comfort, increased resale value and reduced utility bills.

This is a project you could take on yourself for only a fraction of the cost of hiring an expert. It requires the right tools and an hour or two of your time.

Glass

Replace your old single-paned windows with tempered insulated glass to increase energy efficiency, reduce noise, and maintain the historic integrity of your older home. A majority of homeowners with hand tools can replace windows with ease. You'll also require an extra window pane, glazier's suggestions, pliers, and latex glaze putty. If necessary, you can make use of a heat gun to warm the old putty. Wear safety glasses and gloves before you begin. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers for this however, a flathead may be useful as well. Then, use a wooden chisel or putty knife to remove the rest of the old putty from the frame and sash. Be careful not to damage the window sash. Work slowly and carefully. This is best done on a ladder, not on the ground. Also, you should have someone below the sash keep it in place.

Prepare the window frame to accommodate the new pane once you have removed the old glue. 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). These measurements can be sent to a home center or hardware store to get a piece cut of stock glass to the right size. Alternately, you can cut the glass yourself if you have the tools you need.

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

Before applying the putty knead it thoroughly until it's soft and free of lumps. Roll it into pencil-sized strips. The first strip should be placed to the corner of the frame, moving from one corner to another so that it is smooth and even.

Glazier's Points

The glazier's facets are small triangular pieces of metal which help to secure glass into a window frame 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 expense of a professional installation.

After getting rid of the old putty glazier points and any leftovers clean the frame thoroughly with an utility knife. Lightly sand the wood into the rabbet grooves if needed to smooth rough areas. If you sand wood protect it with painter’s tape to prevent accidental damage.

Note down the dimensions of the frame. Take these measurements to a 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 into the frame and push it in place using your hand. Make use of the chisel's point or the back of the putty knife to tap in the glazier's points as illustrated in Figure 11. After you're done, the points should be level with the top edge of the pane. the shoulders of the points should be just below the rabbet's lip. groove.

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

After the glazing compound dries it's time to put in the new window sash. First, saturate the wood with a thick coat of linseed oil. This will prevent the new putty from drying out and cracking due to the moisture it absorbs. Apply this coat using a brush or the edge of your putty knife, and then employ the chisel or back end of the knife to gently hammer in the new sash and glazier's point into the grooves of the rabbet. Repeat this process at intervals of 10 inches all around the frame.

Putty

A baseball hit, a rock thrown in error, or a fallen tree can result in a cracked or cracked window. Fortunately, windows can be repaired by simply placing a new piece in 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 known as glazing compound. Before installing a replacement window pane, first get rid of the old one and clean the area using a rag and the pull-type paint scraper or a wood chisel. Wear protective glasses and gloves when you work. You'll need a heat gun in the event that the window is glued into the frame.

If you are planning to install your original sash, you must remove the molding that supports the old pane. Sand the sash until it is flat and ready for new caulk. Once the sash is put back in place, you can apply a silicone caulk to the Glass window replacements. This will ensure that it won't be leaking or fade over time.

Take the glazing points out of 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 up first. If you're using a heated gun, be careful not to cause damage to the railings or sash by placing the tool too close.

Once the old glazing points and 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 be. It is crucial that the glass rests against the putty on each side, so if you need to tap it, gently press the glass into the rabbet with your thumb.

If the new pane has cracked, you can use a silicone caulk or glass glue based on solvents to cover the crack prior to pressing it into the sash. Otherwise, you'll need to apply putty over the crack to form a tight seal and keep water out. Once the putty is dry, wipe the oily film off the glass and allow it to dry completely before you paint. If you paint before the putty has completely dry, it won't form a solid seal and could discolor or leak over time.

Paint

If you've suffered a break in a window pane, then you may be worried about the expense of replacing it. In reality, replacing a single piece of glass replacement for window doesn't have to be expensive when you do it on your own. Even double-paned windows can be replaced at a fraction of the cost it will cost an expert.

If you are working with large glass windows first, ensure that it is securely attached to the frame. This can be done relatively easy and fast using the proper tools and techniques.

Once you're ready to begin taking off the old window pane by removing the glazing points made of metal that are connected to it. These are tiny triangles of metal that act as "nails" to hold the window in place. They are submerged beneath a glaze putty or bead which hardens into a solid wedge that holds the frame firmly in position and conceals the edges.

After removal of the old pane clean the frame and wood. Scrape off any paint that has been used and sand the rabbet grooves in which the glazing points were. These should be sanded to bare wood, to allow you to paint them the same shade as the rest of the frame. After the sanding process, apply a coat of flax oil on the wood that is not sanded down to prolong its life.

Then, take measurements of the dimensions of the window opening. It is necessary to take horizontal and vertical measurements of the entire opening as well as the thickness of the old pane. 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 seasonal change. You can take these measurements to a hardware store or home improvement shop 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.