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How to Replace Window Panes

A damaged window pane could cause a lot of trouble. It can also be a chance to upgrade your glass to energy efficient or insulated windows and enjoy benefits such as more comfort, higher the value of resales and lower utility costs.

It's a task you can take on yourself for only a fraction of the cost of hiring a professional. It requires the right tools and only an hour or two of your time.

Glass

replace window pane your single-paned windows with tempered or insulate glass to improve energy efficiency, cut down on noise, and preserve the historic integrity of your older home. A majority of homeowners with hand tools can replace windows with ease. You will also need an extra window pane, glazier's tips pliers, and latex glazing putty. If necessary, you can use a heatgun to warm the old putty. Before starting, wear gloves and safety goggles as working with broken glass could cause injuries.

Begin by removing any broken pieces of glass. It is recommended to use pliers for this however, a flathead may be used equally. Utilize a wood chisel or putty knives, to take away any old putty that remains around the frame and window sash. Be careful and slow and be careful not to break the existing window sash. This should be done on a ladder, not the ground. Also, ensure that someone on the ground to ensure it is held steady.

Once you have removed all of the old putty, you can prepare the window frame to accommodate the new pane. Find the width and the height of the opening in the sash by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be sent to a hardware or home center store to get cut a piece of stock glass to the right size. You can also cut the glass yourself if you have the right tools.

After putting in the new glass, apply caulking on the edges. This will make the glass weatherproof. Install a glazier's pointing on both sides of the frame. This will secure the pane. The points shouldn't be so tight that they create friction between the sash and the frame but they should not be too loose.

Before putting the putty on, knead it thoroughly until it's soft and free of lumps. Roll it into pencil-sized strips. Apply the first strip to the corner of the frame, working from one corner to another to ensure it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of metal that allow glass to be secured into the window frame without causing any damage to the fragile surface. Learning how to use these tiny helpers is simple and can save you money on professional installation or the cost of new glass.

After the old putty as well as glazier's points are removed and the frame is thoroughly cleaned using a utility knife to eliminate any remaining traces. Lightly sand the wood in the rabbet grooves if needed to smooth out rough areas. If you do sand your wood, make sure to protect it with painter's tack to avoid accidental damage.

Take measurements of the empty frame and write down accurate measurements. Bring these measurements to a hardware store or home center, and have the new pane cut slightly smaller than the frame's opening. This will ensure a snug fit and will allow room for expansion and contraction.

Place the new window in the frame and push it into the frame by using your hands. Then, use the tip of your chisel or back of the putty knife to make a tap on the glazier's points, as shown in Figure 11. The glazier's points should sit flush against the top edge of your pane, and the shoulders raised should be just beneath that lip.

Apply a small amount of glazing compound on 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 replacement window seals sash once the glazing compound has dried. First, coat the wood with a thick coat of Linseed oil. This will keep the new putty from taking up moisture and deteriorating and Replace window pane cracking with time. Apply this coat using a brush or the tip of your knife, and then employ the chisel or back end from the putty knife to gently hammer in the new sash and glazier's points into the rabbet grooves. Repeat this procedure every 10 inches along the perimeter of the frame.

Putty

A baseball thrown or a rock thrown in error or a branch falling could result in a broken or cracked window pane. Most windows can be replaced easily by simply putting in a fresh piece. The glass is held into place by a small metal clip, also known as the glazier's point, and putty. This compound is also called glazing compound. Before you install a new pane, first get rid of the old one and clean the area with the help of a rag, an abrasive scraper that is a pull type or a wood chisel. Wear protective glasses and gloves when working. You'll need a heat gun if the window is glued to the frame.

If you plan to reinstall the original sash, gently remove the molding pieces that hold the old pane in place. Sand the sash until it's flat and ready to receive new caulk. Once the sash is installed then, apply a new silicone caulk around the glass to ensure it won't leak or discolor as time passes.

Take the glazing points out of the rabbets and the grooves in the sash, where the glass sits. If they're hard to chisel, hold the hand tool, such as a heating gun over them to soften first. When using a heated tool, be careful to avoid damaging the sash or its railings.

Make the bed for your new pane after you have removed the old glaze points and putty. Roll a piece of glazing compound between your hands, and form it into a 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 you need to, lightly tap your glass into the rabbet with your thumb.

If the new pane has damaged, you can use a silicone caulk or a glass glue made from solvents to cover the crack before pressing it in the sash. If the crack isn't sealed, you'll need to apply putty to keep water from getting in. After the putty is dry, clean the oily film off the glass using the help of a rag. Allow it to completely dry before painting. If you paint before the putty is fully dry, it won't form a strong seal and may leak or discolor over time.

Paint

If you've had a broken window pane, you may be worried about the cost of replacing it. In reality, replacing a single pane of glass doesn't have to be expensive when you do it on your own. Even a double-paned window can be replaced for a fraction of the price it would cost for a professional.

If you're working with a large glass window, first make sure it is securely attached to the frame. This job can be done relatively easy and fast with the appropriate tools and techniques.

When you are ready to begin with the removal of the window pane. Take out the glazing points made of metal that are attached to it. These are small metal triangles that function as "nails" to hold the window in the frame. They are placed under a glaze putty or bead that hardens to a solid wedge which holds the wood frame firmly in position and hides the points.

Once you have the old pane taken away clean the surrounding frame and wood. Scrape off any paint that has been used and sand the rabbet grooves in which the glazing points were. Sand them to bare wooden surfaces, allowing you to paint the frames the same color. After the sanding process, apply a coat of flax oil to the wood that is not sanded down to prolong its life.

Then, you need to measure the size of the window opening. You'll need to determine the vertical and horizontal dimensions of the entire opening as well as the thickness. To get 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 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.