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How to Replace Window Panes

A damaged or cracked window is an issue. It could be a chance to upgrade your windows to energy efficient or insulated ones, and reap advantages like improved comfort, higher resale value and reduced utility bills.

You can do it yourself at less than what it would cost to employ an expert. It requires the right tools and only an hour or two of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged replacing them with modern glass that is tempered or insulated can increase energy efficiency and reduce noise while maintaining the historical integrity of older homes. Most homeowners with basic hand tools can replace windows with ease. In addition to a Replacement sash Windows cost pane, the following tools are required for the replacement process: latex glazing putty Glazier's points; pliers and an electric heater to warm the old putty, if necessary. Before starting, put on protective gloves and goggles since working with broken glass could cause injuries.

Begin by removing any remaining broken pieces of glass. It is best to use pliers however a flathead could work as well. Then, use a wooden chisel or putty knife to remove the rest of the old putty around the frame and the sash. Be careful to not damage the window sash. Take your time and work slowly. It is a good idea to do this using a sturdy ladder rather than on the ground, and to place someone on the sash to help keep it in place.

After you've removed all the old putty, you can prepare the window frame to accommodate the new pane. Find the width and the height of the opening for the sash and subtract 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 have a piece cut of glass that is in stock to the correct size. You can cut the glass yourself if you possess the right tools.

After installing the new glass, apply some caulking around the edge. This will make the glass weatherproof. Install a glazier's point on both sides of the frame. This will secure the pane. The points should not be so tight that they cause friction between the frame and sash however they should not be loose.

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

Glazier's Points

The glazier's facets are small triangular pieces which help to secure glass into a window frame without scratching or damaging the fragile surface. It's simple to learn how to use this secret tool, and you'll be able to save money on the cost of an expert installation.

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 to smooth rough areas. If you sand wood, protect it with painter’s tape to prevent accidental damage.

Write down the dimensions of the frame. These dimensions can be taken to the hardware or home center store and the new pane will be cut to a smaller size. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new pane into the frame and push it into place firmly by using your hands. Then, use the tip of your chisel, or the back of the putty knife to tap in the glazier's facets, as illustrated in Figure 11. The glazier's points should sit aligned with the top edge of your pane, and the raised shoulders should be just beneath that lip.

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

Once the glazing compound has dried it's time to put in the new window sash. First, coat the wood with a thick layer of linseed. This will prevent the newly-created putty drying out or cracking due to the moisture it absorbs. Apply this coat using a brush or the edge of your putty knife, then use the chisel or the back end of the knife to gently hammer the new sash and glazier's points into the grooves of the rabbet. Repeat this process in intervals of 10 inches all around the frame.

Putty

A baseball that is thrown or a rock that is errant or a fallen branch can cause a window and door replacement pane to break or crack. Luckily, most windows can be replaced by simply putting a brand new piece in place. The glass is held in position by a small metal clip, also known as the glazier's point, and putty. This compound is also known as glazing compound. Before installing a new pane, first get rid of the old one and clean the area using the help of a rag, an abrasive scraper that is a pull type or the wood chisel. Wear protective glasses and gloves while you do this work. If the window is glued to the frame, you'll have to make use of a heat gun to soften the adhesive before prying it free.

If you are planning to replace the original sash, gently remove any molding pieces that hold the old pane in place. Sand the sash until it's flat and ready for new caulk. Once the sash is installed then, apply a new silicone caulk to the glass to ensure that it will not leak or change color as time passes.

Remove the glazing points in the rabbets. These are the grooves on 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 first. If you're using a heat gun, be careful not to damage the railings or sash by holding the tool too close.

Once the old glazing points and putty have been removed, prepare a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Place it into the rabbets, where the glass will be placed. It is essential that the glass rests against the putty on each side If you have to, lightly tap the glass into the rabbet using your thumb.

If the new pane is damaged, you can use a silicone caulk or a glass glue based on solvents to seal the crack prior to pressing it in the sash. If not, you'll have to putty over the crack to create an impervious seal to keep water out. Once the putty is dry, wipe the oily film off of the glass and allow it to dry completely before painting. If you paint before the putty is completely dry, it won't create a solid seal and could leak or discolor in time.

Paint

If you've had a broken window pane, then you may be worried about the expense of replacing it. The truth is, replacing a single pane glass doesn't have to be expensive even if you do it your own. Even a double-paned window can be replaced for a fraction of the price it will cost a professional.

If you are working with a large glass window first ensure it is securely attached to the frame. This task is relatively easy and quick with the right tools and techniques.

When you are ready to start with the removal of the window pane. Pry out the glazing points made of metal that are attached to it. These are small metal triangles that act as "nails" that hold the window sash replacement in the frame. They are placed under a glaze putty or bead that sets to form a solid wedge that holds the frame securely in place and hides the sharp edges.

After removal of the old pane clean the frame and wood. Scrape away any old paint and sand down the rabbet grooves where the glazing points were. These should be sanded to bare wood to allow you to paint them the same shade as the rest of the frame. After sanding the wood, apply a layer of flax oil. This will help to prolong the life of the frame.

The next step is to measure 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. To get the exact size of the new pane subtract 1/8 inch from both measurements. This will allow for seasonal changes in the glass window replacements. You can take these measurements to a hardware or home improvement shop and have the glass 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.