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How to Replace Window Pane Window Panes

A cracked window pane is a nuisance. It could also be an opportunity to upgrade your glass to energy-efficient or insulated windows and reap benefits like improved comfort, increased resale value and reduced utility costs.

It's a project you can do yourself for less than the cost of hiring a professional. It requires the right equipment and an hour or two of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged, replacing them with newer insulated or tempered glass can increase energy efficiency and decrease noise while also preserving the historic integrity of older homes. The process of replacing windows is easy and can be completed by homeowners with basic hand tools. In addition to a replacement pane, the following tools are needed: latex glazing putty; glazier's points; pliers; and a heat gun for warming the old putty, if necessary. Wear safety goggles and gloves before you begin. Working with broken glass could result in serious injuries.

Take away any broken glass pieces that remain. It is best to use pliers however a flathead could work as well. Use a wood chisel, or putty knives to remove any old putty remaining around the frame and window sash. Be careful not to damage the window sash. Be careful and slow. This is best done on a ladder, not on the ground. Also, you should have someone lower to ensure it is held steady.

Make sure that the window frame is ready to accommodate the new pane when you have removed the old putty. To allow for seasonal expansion or contraction and contraction, subtract 1/8 inch from the measurements of the width and height. Bring these measurements to an hardware store or home center and find a piece glass cut to size. Alternately, you can cut the glass yourself, if you have the right tools.

After putting in the new glass Apply a small amount of caulking to the edge. This will make the glass weatherproof. Then, place a glazier's tip on each side of the frame to hold the pane in place. The points shouldn't be too tight as to cause friction between the frame and sash however they shouldn't be too loose.

Before applying the putty make sure to knead it until it is smooth and free of lumps. Then, roll it into pencil-size strips. The first strip should be placed to the corner of the frame, moving from one corner to the other so that it is smooth and even.

Glazier's Points

The glazier's points are tiny triangular pieces of steel which help to secure the glass into the window frame without damaging the delicate surface. Learning how to use these hidden little helpers is easy and can save you money on professional installation or the cost of buying new glass.

After taking off the old putty, glazier points as well as any remaining residue Clean the frame thoroughly with an utility knife. Lightly sand the frame in the rabbet grooves if needed to smooth out rough areas. If you do sand your wood, be sure to protect it by using painter's tape to prevent accidental damage.

Measure the empty frame's dimensions and record precise measurements. Bring these measurements to a hardware store or a home center, and have the new pane cut smaller than the frame's opening. This will ensure a secure fit, and allow for expansion and contraction.

Place the new window in the frame and press it into the frame with your hand. Then, use the tip of your chisel, or the back end of the putty knife to pierce the glazier's points, as illustrated in Figure 11. When you're done taping, they should be in line with the top edge of the pane. the raised shoulders of the points should be below the rabbet's rim groove.

Apply a thin layer glazing compound on the rabbet grooves and edges of the new glass. This will seal and protect the edges. Let it dry and cure fully.

When the glazing compound is dry, Replace Window Pane you're ready to install the new window sash. First, coat the wood with a thick coat of linseed oil. This will stop the new putty from soaking up the moisture and deteriorating and cracking over time. Apply the coat using a brush or the tip of your knife, then use the chisel, replace window pane or the back end of the putty knife to gently press the new sash and glazier's tips into the rabbet grooves. Repeat this process at intervals of 10 inches around the frame.

Putty

A hurled baseball, an errant rock or a fallen branch can cause a window pane to break or crack. The majority of windows can be replaced by installing a new piece. The glass is held in the position with a tiny metal clip, referred to as a glazier’s point and putty. This compound is also referred to as glazing compound. Before installing a replacement pane, first get rid of the old one and clean the area with the help of a rag, the pull-type paint scraper or the wood chisel. Wear protective glasses and gloves while doing this work. If the window is attached to the frame, you'll need employ a heat gun in order to soften the adhesive prior to cutting it loose.

If you are planning to reinstall your original sash, you must remove the mold that holds the old pane. Then sand the sash to ensure it's smooth and ready for new caulk. Once the sash is put back in place then, you can apply a silicone caulk on 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, where the glass is. If they're hard to chisel out, try holding a hand tool like a heat gun over them to soften them up first. If you're using a heated gun, be cautious not to cause damage to the railings or sash by using the tool too close.

Once the old glaze points and putty have been removed prepare 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. Place it into the rabbets where the glass will be placed. The glass must be positioned against the putty on both sides. If necessary gently tap your glass into the rabbet using your thumb.

If the new pane has cracked, you can apply a silicone caulk or glass glue based on solvents to cover the crack prior to pressing it in the sash. If the crack is not sealed, you will need to apply putty to keep water from getting in. After the putty is dry, clean the oily film off the glass using an abrasive and allow it to dry completely prior to painting. Paint after the putty has completely dried. It won't create a solid seal and may discolor or leak over time.

Paint

You may be concerned about replacing a broken pane of glass. The truth is, replacing a single pane glass doesn't need to be expensive if you do it on your own. Even a double glazing replacement windows-paned window can be replaced for a fraction of the price it costs for a professional.

If you are working on a large-sized window, ensure that it is securely fastened to the frame. This can be made relatively simple and quick with the proper tools and techniques.

If you're ready to begin taking off the old window pane by prying out the glazing points made of metal that are connected to it. They are basically tiny metal triangles which function as "nails" that hold the window in place in the wood frame. They are buried under a bead of glazing putty that hardens into a solid, moulded wedge that secures the window in place and conceals the points.

After removal of the old pane clean the frame and wood. Scrape away any paint and sand down the rabbet grooves where the glazing points were. Sand them down to bare wood surfaces, so that you can paint the frames with the same color. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

The next step is to measure the dimensions of the window opening. It is necessary to measure the vertical and horizontal dimensions of the entire opening as well as the thickness. Subtract 1/8 inch from each measurement to ensure you have the exact size for the new pane. This will also allow for expansion and contraction of the glass during seasons of 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.