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How to Replace Window Panes

A damaged window pane could be a source of frustration. It could be a chance to upgrade to energy-efficient windows replacement or insulated ones and enjoy benefits like increased comfort, increased resale values and lower utility costs.

It's a task you can do yourself for a fraction of the cost of hiring an expert. It requires the right equipment and an hour or two of your time.

Glass

Replace your old single-paned windows using tempered or insulation glass to improve energy efficiency, reduce noise, and protect the historical integrity of your older home. The replacement of windows is simple and can be done by anyone with basic hand tools. In addition to a new pane, the following tools are needed such as latex glazing putty; glazier's points; pliers; and an electric heater to warm the old putty if required. Wear safety goggles and gloves prior to starting. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. This can be done with pliers, however, flathead screwdrivers can work in a pinch. After that, use a wood chisel or putty knife take the remainder of the old putty from the frame and the sash. Work slowly and carefully, taking care not to break the current window sash. This can be done best on a ladder, not on the ground. Also, have someone lower to hold it steady.

Make sure that the window frame is ready to accept the new pane once you have removed the old putty. Take measurements of the width and height of the sash opening and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be taken to a hardware or home center store to have a piece cut of glass stock to the proper size. You can also cut the glass by yourself if you possess the right tools.

After installing the glass, apply some caulking to the edge. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will help secure the pane. The points should not be so tight as to cause friction between the sash and the frame but they 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 to the corner of the frame, working from one corner to the next to ensure it is smooth and even.

Glazier's Points

The glazier's points are small triangular pieces of steel which help to secure the glass to the frame without damaging the delicate surface. It's simple to learn how to use this nefarious tool and you can save money on the cost of an expert installation.

After the old putty and the glazier's points have been removed and the frame is thoroughly cleaned using a utility knife to eliminate any remaining residue. Lightly sand the wood into the rabbet grooves to smooth rough areas. If you decide to sand wood, cover it with painter's tape to prevent accidental damage.

Take the dimensions of the frame and write down accurate measurements. These measurements can be taken to an hardware or home centers store and the new pane will be cut a bit smaller. 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 end of the putty knife to tap in the glazier's points, as shown in Figure 11. The glazier's point should be in line with the top edge of your pane and the raised shoulders should be just beneath that lip.

Apply a thin layer of glazing compound over 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 once the glazing compound has dried. The first step is to coat the wood with a heavy coat of linseed oil. This will prevent the new putty from taking up the moisture and deteriorating and cracking with time. Apply the coat using a brush or the tip of your knife, and then use the chisel or the back end from the putty knife to gently hammer in the new sash and glazier's tips into the grooves of the rabbet. Repeat this procedure every 10 inches around the frame's perimeter.

Putty

A hurled baseball, an errant rock or a fallen branch can cause a window to crack or break. Most Replacements Windows can be replaced easily by simply putting in a fresh piece. The glass is held in place by a small metal clip called the glazier's pointed and putty, which is often called glazing compound. Before installing a replacement glass in windows pane, first remove the old one and clean the area with a rag and a pull-type paint scraper or an abrasive wood chisel. Wear gloves and safety glasses while working. If the window is glued to the frame, you'll need to employ a heat gun in order to soften the adhesive prior to taking it off.

If you are planning to replace 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 re-installed then, apply a new caulk made of silicone around the glass to ensure that it won't leak or discolor over time.

Take the glazing points out of the rabbets, the grooves in the sash, where the glass is. If they're difficult to cut out, try placing the hand tool, such as a heat gun over them to soften them up first. If you're using a heating gun, be cautious not to scratch the sash or its railings by using the tool too close.

Make the bed for your new pane by removing the old putty and glazing points. Roll a piece of glazing compound between your hands, forming it to be around 1/2-inch thick. Press it into the rabbets where the glass will be placed. The glass must be positioned against the putty on both sides. If necessary you want to tap your glass lightly into the rabbet with your thumb.

If the new pane is cracked, you can apply the silicone caulk or glass glue that is based on solvents to cover the crack before pressing it in the sash. If not, you'll have to putty over the crack to create an impervious seal to keep water out. After the putty has dried remove the oily film off the glass and let it dry completely before you paint. Paint before the putty is completely dry. It will not form a good seal and may discolor or leak over time.

Paint

You might be worried about replacing a damaged piece of glass. But the truth is that replacing one glass pane does not need to cost a fortune If you can do it yourself. Even a double-paned window could be replaced for a fraction of the price it costs for a professional.

If you're working with large glass windows first, ensure that it is securely fixed to the frame. This can be made relatively simple and fast with the proper tools and techniques.

When you're ready to start with the removal of the old window pane by removing the glazing points of metal that are connected to it. These are basically small metal triangles which function as "nails" that keep the window in in the wood frame. They are placed under a bead or glazing glue which hardens into solid wedge that holds the frame firmly in position and hides the points.

After removing the old pane, clean the frame and wood. Scrape off any old paint and sand down the rabbet grooves that the glazing points were. These should be sanded down to bare wood, to allow you to paint them the same color as the rest of the frame. After the sanding process, apply a coat of flax oil on the bare wood to help extend its lifespan.

The next step is to measure 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 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 change. Take these dimensions to a hardware or home improvement store and ask them to cut you 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.