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How to Replace Window Panes

A cracked window pane can be a source of frustration. It could be a chance to upgrade your windows to energy efficient or insulated ones to enjoy benefits such as improved comfort, increased resale value and reduced utility costs.

It's a project you can tackle yourself at a fraction of 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 damaged, cracked or deteriorating replacing them with more modern glass window replacement that is tempered or insulated will increase energy efficiency and decrease noise while preserving the historical integrity of older homes. The replacement window panes of windows is easy and can be accomplished by anyone with basic hand tools. In addition to a replacement double glazing windows pane, the following items are required: latex glazing putty; glazier's points; pliers; and an electric heater to warm the old putty, if necessary. Wear safety glasses and gloves prior to beginning. Working with broken glass for windows replacement could cause serious injuries.

Begin by removing any broken pieces of glass. It is best to use pliers for this however a flathead could be used as well. Make use of a wood chisel or putty knives, to take away any old putty remaining around the frame and the window sash. Take your time and work slowly and be careful not to break the existing window sash. It is best to do this on a sturdy ladder rather than on the ground, and to have someone standing below the sash in order to help hold it steady.

Make sure the window frame is ready to receive 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. Take these measurements to an hardware store or home center, and get a piece of stock glass cut to size. Alternately, you can cut the glass yourself if have the tools you need.

After installing the new glass Apply caulking on the edges. This will make the glass weatherproof. Then, you can install a glazier's pointing on each side of the frame to secure the pane into the right place. The points should not be so tight that they create friction between the sash and frame but they should not be too loose.

Before applying the putty on the surface, gently knead it until it becomes soft and free of lumps. Then you can roll it into pencil-sized strips. Apply the first strip to the corner of the frame. Work from one corner to the next, making sure it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of steel that help secure the glass into the window frame without causing any damage to the fragile surface. Knowing how to use these hidden tiny pieces of help is simple and can save you money on professional installation or the cost of windows replacement of new glass.

After the old putty as well as the glazier's point are gone and the frame is thoroughly cleaned with a knife to eliminate any remaining residue. If necessary, lightly sand the wood along the grooves of the rabbet to smooth out rough spots. If you do sand the wood, ensure you protect it with painter's tape to avoid accidental damage.

Note down the exact dimensions of the frame. Take these measurements to a hardware store or a home center and request that the new pane cut smaller than the frame's opening. This will ensure a secure fit and will allow room for expansion and contraction.

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

Apply a thin layer of glazing compound to the rabbet grooves and edges of new glass. This will protect and seal the edges. Allow it to 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 coat of Linseed oil. This will prevent the new putty drying out or cracking as it absorbs moisture. Use a brush to apply this coat, or the point of the blade. Then use the chisel that is on the back of the tool or the back of the putty handle to gently hammer the new sash or glazier's point into the rabbet grooves. Repeat this process in intervals of 10 inches around the frame.

Putty

A hurled baseball or an unintentional rock, or a falling branch can cause a window pane to crack or break. Most windows seal replacement can be replaced easily by simply putting in a fresh piece. The glass is held in position by a small metal clip, referred to as a glazier's point and putty. This compound is also known as glazing compound. Before installing a replacement pane, first take out the old one and clean up the area using the help of a rag, a pull-type paint scraper or an abrasive wood chisel. Wear safety glasses and gloves when working. If the window is glued to the frame, you'll have to use a heat gun to soften the adhesive before prying it free.

If you are planning to replace the original sash, take off the mold that holds the old pane. Then, sand the sash to ensure it's level and ready for a new caulk. Once the sash is reinstalled then, you can apply a silicone caulk to the glass. This will ensure that it won't be leaking or fade over time.

Remove the glazing points from the rabbets. These are the grooves in the sash, where the glass is located. If they are hard to chisel, hold an instrument such as a heating gun over them to soften first. When using a heat tool, be sure to not scratch the sash's railings and sash.

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 fingers, and then make it about 1/2 inch thick. Then, you can press it into the rabbets, where the glass will rest. The glass must rest against the putty on both sides. If needed, lightly tap your glass into the rabbet with your thumb.

If the new pane is cracked, you can apply a silicone caulk or a glass glue based on solvents to cover the crack prior to pressing it into the sash. If the crack isn't sealed, you will need to use putty to keep water out. When the putty dries and the film is oily, wipe it off the glass using a rag and allow it to completely dry before painting. If you paint before the putty is completely dry, it won't form a strong seal and may leak or discolor over time.

Paint

If you've suffered a break in a window pane, you may be concerned about the expense of a new one. But the truth is that replacing one glass pane does not require a huge amount of money when you do it yourself. In fact, even a double-pane window can be replaced at a fraction of the cost of a professional.

First, if you're working on a large window, make sure it is securely fixed to the frame. Using the proper tools and techniques you can accomplish this task fairly easily and fast.

If 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 basically small metal triangles which function as "nails" that hold the window in place in the wood frame. They are buried beneath a bead or glazing glue that hardens to an unbreakable wedge that holds the wood frame in place and conceals the edges.

Once you have the old pane removed, clean up the surrounding frame and wood. Scrape away any old paint and sand down the rabbet grooves where the glazing points used to be. These should be sanded to bare wood so that you can paint them the same shade as the rest of the frame. After sanding, apply a layer of flax oil on the wood's surface to help extend its lifespan.

Then, take measurements of the dimensions of the window opening. You'll need to take vertical and horizontal measurements of the entire opening and also 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 allow for seasonal changes in the glass. 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.