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How to Replace Window Panes

A cracked window pane is an issue. This could be an opportunity to upgrade your windows to energy efficient or insulated ones to enjoy advantages like improved comfort, increased resale value and reduced utility costs.

You can do it yourself for only a fraction of the cost it would cost to employ an expert. You'll need only the right tools and a few minutes of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged, replacing them with newer glass that is tempered or insulated can increase energy efficiency and reduce noise while maintaining the original character of older homes. Most homeowners with basic hand tools can replace the window pane. You will also require an extra window pane, glazier's tips, pliers, and latex glazing putty. If necessary you may make use of a heat gun to warm the old putty. Before beginning, wear protective gloves and goggles since working with broken glass can cause injuries.

Begin by removing any broken pieces of glass. This is best done using pliers, however, a flathead screwdriver may be used in a pinch. Then, use a wooden chisel, or putty knife, to take the remainder of the old putty around the frame and the sash. Be careful not to break the window sash. Take your time and work slowly. This is best done on a ladder, not on the ground. Also, ensure that someone on the ground to hold it steady.

Make sure that the window frame is ready to accept the new pane after you have removed the old glue. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of width and height. These measurements can be taken to a home center or hardware store to get an item cut from stock glass to the right size. You can cut the glass yourself if you have the right tools.

After putting in the new glass After installing the glass, apply caulking to the edge. This will make the glass weatherproof. Then, place a glazier's tip on each side of the frame to secure the pane in the right place. The points shouldn't be too tight that they cause friction between the sash and frame, but they also shouldn't be too loose.

Before applying the putty to the surface, gently knead it until it becomes soft and free of lumps. Roll it into pencil-sized strips. Apply the first strip to the frame's corner. Work from one corner to another and ensure that it is even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces of metal that allow glass to be secured into frames for windows without damaging or scratching the delicate surface. Learning how to use these little helpers is easy and could save you money on a professional installation or the cost of new glass.

After the old putty and the glazier's points have been removed and the frame is thoroughly cleaned using a utility knife to get rid of any remaining traces. If necessary, lightly sand the wood in the grooves of the rabbet to smooth out rough spots. If you do sand your wood, be sure to protect it with painter's tack to avoid accidental damage.

Note down the dimensions of the frame. 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 that the pane fits comfortably and allows for expansion and contraction.

Place the new pane into the frame and push it in place with your hand. Use the point of the chisel, or the edge of the putty blade to tap in the glaziers' points as illustrated in Figure 11. The glazier's points should be flush against the top edge of your pane and the shoulders raised should be just beneath that lip.

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

Install the new window sash once the glazing compound has dried. The first step is to coat the wood with a thick layer of linseed. This will prevent the new putty from sucking up the moisture and drying out and cracking over time. Use a brush to apply this coat, or even the tip of the putty blade. Then, use the chisel on the back of the tool or the back of the putty handle to gently hit the new sash, or glazier's point into grooves of the rabbet. Repeat this process at intervals of 10 inches around the frame.

Putty

A baseball that is thrown, an errant rock or falling branch could cause a window pane to break or crack. Luckily, most windows can be repaired by simply putting a brand new piece of glass in its the right place. The glass is held in place with a small metal clip called a glazier's point and putty, which is often called glazing compound. Before installing a new pane, first take out the old one and clean up the area with an abrasive and the pull-type paint scraper or an abrasive wood chisel. Wear protective glasses and gloves when working. If the window is attached to the frame, you'll need to make use of a heat gun to soften the adhesive before taking it off.

If you're planning to install the original sash, take off the molding that supports the old pane. Then sand the sash to make sure it's flat and ready for a 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 won'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 difficult to cut out, try holding the hand tool, such as a heat gun over them to soften them before you do. If you're using a heated gun, be cautious not to scratch the railings or sash by placing the tool too closely.

Prepare a bed for your new pane by removing the old glaze and putty. Roll a rope of glazing compound between your fingers and then make it about 1/2 inch thick. Then, press it into the rabbets in which the glass will rest. It is essential that the glass rests against the putty on both sides, 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 cover it with a solvent-based glass glue or silicone caulk prior to pressing it into the sash. If the crack isn't sealed, you'll need to apply putty to keep water out. Once the putty is dry clean the oily film off of the glass and allow it to dry completely before painting. If you paint before the putty is fully dry, it won't create an effective seal and could leak or discolor over time.

Paint

If you've had a broken window pane, you might be worried about the cost of replacing it. The truth is, replacing a single pane glass doesn't need to be costly when you do it on your own. Even double-paned windows can be replaced for a fraction of the price it will cost an expert.

First, if you're working on a large-sized replacement window seals, make sure that it is securely fixed to the frame. By using the correct tools and techniques to complete this task easily and speedy.

Once you're ready to begin with the removal of the old window sash replacement by prying out the metal glazing points that are connected to it. These are tiny metal triangles that function as "nails" that hold the window within the frame. They are submerged beneath a glaze putty or bead that hardens to a solid wedge which holds the wood frame in place and conceals the edges.

After removal of the old pane clean the frame and wood. Scrape off any paint and sand glaziers down the rabbet grooves where the glazing points were. Sand them down to clean wood surfaces, so that you can paint the frames the same shade. After sanding, apply a coat of flax oil to the bare wood to prolong its life.

Next, measure the dimensions of the window opening. You will need 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 that you have the exact size for the new pane. This will also allow for expansion and contraction of the glass during seasons of change. Take these measurements to the 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.