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How to Replace window pane Window Panes

A cracked window pane is an inconvenience. It could be a chance to upgrade to energy-efficient windows or insulated ones and enjoy advantages like improved comfort, increased resale value and lower utility costs.

You can do it yourself at a fraction of what it would cost to employ an expert. You only need the right tools and a few hours of your time.

Glass

If your single-pane windows are old, deteriorating or broken, replacing them with newer insulated or tempered glass can improve energy efficiency and reduce noise while also preserving the historical integrity of older homes. The process of replacing windows is simple and can be done by homeowners with basic hand tools. Alongside a replacement double glazed windows pane, the following items are required for the replacement process: latex glazing putty Glazier's points; pliers and an electric heater to warm the old putty if required. Before beginning, wear gloves and safety goggles as working with broken glass may cause injuries.

Begin by removing any broken pieces of glass. It is best to use pliers however, a flathead may work equally. After that, use a wood chisel or putty knife take the remainder of the old putty around the frame and the sash. Be careful to not scratch the window sash. Work slowly and carefully. It is recommended to work using a sturdy ladder rather than the ground, replace window pane and to have someone stand below the sash to help keep it in place.

After you have removed all the old putty, it is time to prepare the window frame to fit the new pane. To allow for seasonal expansion or contraction by subtracting 1/8 inch from the measurements of width and height. Bring these measurements to a hardware store or home center, and have a piece of stock glass cut to size. You can also cut the glass by yourself if you have the appropriate tools.

After putting the new pane in place, run a small bead of caulking around the edge to seal it against weather. Install a glazier's point on both sides of the frame. This will help secure the pane. The points shouldn't be too tight as to cause friction between the sash and frame but they shouldn't be too loose.

Before applying the putty on the surface, gently knead it until it becomes soft and free of lumps. Roll it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from corner to corner, making sure it is even and smooth.

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. Understanding how to use these tiny pieces of help is simple and can save you money on a professional installation or the cost of buying new glass.

After taking off the old putty, glazier points as well as any remaining remnants clean the frame thoroughly with an utility knife. Lightly sand the wood in the rabbet grooves if needed to smooth out rough areas. If you decide to sand the wood, be sure to protect it with painter's tack to avoid accidental damage.

Write down the dimensions of the frame. Take these measurements to an hardware store or home center and request that 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.

Insert the new pane into the frame and push firmly using your hands. Then, use the tip of your chisel or back end of the putty knife to make a tap on the glazier's points, as illustrated in Figure 11. The glazier's point should be flush against the top edge of your pane, and the shoulders should be just below the lip.

Apply a thin layer of glazing compound to the rabbet grooves as well as the edges of new glass. This will seal and protect the edges. 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 thick layer of linseed. This will stop the new putty from drying out and cracking when it absorbs moisture. Apply the coat using a brush or the tip of your putty knife, then employ the chisel or back end from the putty knife to gently hammer in the new sash and glazier's point into the grooves of the rabbet. Repeat this procedure every 10 inches along the perimeter of the frame.

Putty

A baseball thrown at you, an errant rock or a falling branch can cause a window pane to crack or break. Most windows can be replaced easily by simply putting in a fresh 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 known as glazing compound. Remove the old pane and clean the area using a rag, a pull-type scraper, or a wood chisel. Wear safety glasses and gloves while doing this work. If the window is glued to the frame, you'll need employ a heat gun in order to soften the adhesive before taking it off.

If you're planning to replace your original sash, remove the molding that supports the old pane. Then, sand the sash to ensure it's smooth and ready for a new caulk. Once the sash is re-installed and sanded, apply a fresh silicone caulk to the glass to ensure that it will not leak or change color in time.

Take the glazing points out of the rabbets, the grooves in the sash that the glass sits. If they're difficult to work out, try holding the hand tool, such as a heat gun to soften them first. When using a heating tool, be sure to not scratch the sash or its railings.

After the old glazing points and putty have been removed, prepare a bed for the new pane. Roll a rope of glazing compound between your hands, shaping it to be around 1/2-inch thick. Press it into the rabbets where the glass will be placed. It's important that the glass sits on the putty in all places on both sides If you have to do so, gently tap the glass into the rabbet using your thumb.

If the new pane has a crack, you can cover it with a solvent-based glue or silicone caulk prior pressing it into the sash. If the crack isn't sealed, you'll need to use putty to keep the water out. After the putty is dry, clean the oily film off the glass using a rag and allow it to dry completely before painting. If you paint before the putty has completely dry, it won't create a strong seal and may be leaking or discoloring in time.

Paint

You may be concerned about replacing a broken piece of glass. But the truth is that replacing a single glass pane doesn't have to break the bank if you do it yourself. In fact even windows with double panes can be replaced at a fraction of the cost of an expert.

First, if you're working on a large window, ensure that it is securely attached to the frame. This job is relatively easy and quick with the proper tools and techniques.

When you are ready to begin with the removal of the window pane. Remove the metal glazing points that are attached to it. These are tiny triangles of metal which act as "nails" that hold the window within the frame. They are buried under a bead of glazing putty, which hardens into a solid, moulded wedge that secures the window in place and conceals the points.

After taking off the old pane clean the frame and the wood. Scrape away any paint and sand down the rabbet grooves where the glazing points were. These should be sanded to bare wood so that you can paint them the same shade as the rest of the frame. After sanding the wood then apply a layer of flax oil. This will help to extend its life.

Then, take measurements of the dimensions of the window opening. You'll need to determine the horizontal and vertical dimensions of the entire opening as well as the thickness. 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 measurements to your local 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.