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How to Replace Window Panes

A damaged or cracked window is a nuisance. It could be a chance to upgrade your windows to energy efficient or insulated ones and enjoy benefits like increased comfort, increased resale value and reduced utility costs.

You can do it yourself for 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

Replace Window Pane your single-paned windows using tempered or insulation glass to improve the efficiency of your energy, reduce noise, and protect the original character of your old home. The procedure of replacing windows is easy and can be completed by most homeowners who possess basic hand tools. Alongside 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 can cause serious injuries.

Begin by removing any broken pieces of glass. It is recommended to use pliers for this however, a flathead may be useful equally. Make use of a wood chisel or putty knives, to take away any remaining old putty around the frame and the window sash. Take your time and work slowly and be careful not to break the existing window sash. This is best done on an elevated ladder, not on the ground. Also, ensure that someone below the sash keep it in place.

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, subtract 1/8 inch each from the measurements of the width and height. Take 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 possess the appropriate tools.

After installing the new glass After installing the glass, apply a small amount of caulking to the edge. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will help secure the pane. The points shouldn't be so tight that they create friction between the frame and the sash however they should not be loose.

Before applying the putty make sure to knead it until it's soft and free of lumps. Then you can roll it into pencil-sized strips. Apply the first strip 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 that allow glass to be secured into the window frame without causing damage to the delicate surface. Knowing how to use these hidden tiny helpers is simple and can save you money on professional installation or the cost of buying new glass.

After the old putty as well as the glazier's point are gone and the frame is thoroughly cleaned with a utility knife to eliminate any remaining traces. Lightly sand the wood into the rabbet grooves 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.

Take the dimensions of the frame and note down precise measurements. These dimensions can be taken to an hardware or home centers store, and the new pane will be cut slightly smaller. This will ensure a secure fit, and allow for expansion and contraction.

Place the new window in the frame and push it into the frame with your hand. Make use of the point of the chisel or the edge of the putty blade to tap the glazier's points as illustrated in Figure 11. The glazier's points should be aligned with the top edge of your pane and the shoulders should be just below that lip.

Apply a thin bead of glazing compound on the edges of the glass that has been made and into the rabbet grooves to seal and protect them. Let it 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 an even layer of linseed. This will stop the new putty from taking up the moisture and deteriorating and cracking over time. Apply the coating using a brush this coat, or even the tip of the blade. Then, use the chisel on the back of the putty tool or the back of the putty handle to gently hit the new sash, or glazier's tip into the grooves of the rabbet. Repeat this procedure every 10 inches around the frame's perimeter.

Putty

A baseball thrown or a rock thrown in error, or a fallen tree could result in a broken or cracked window. Luckily, most windows can be replaced by simply putting a new piece in the right place. The glass is held in place with a small metal clip called a glazier's point, and putty, also called glazing compound. Remove the old pane and clean the area using an abrasive, pull-type scraper or wood chisel. Wear protective glasses and gloves while working. You'll require a heat gun if the window is glued to the frame.

If you are planning to replace window pane the original sash, gently remove any molding pieces that are used to secure the old pane. Then you can sand the sash down to ensure it's smooth and ready to be re-caulked. Once the sash is put back in place then, you can apply a silicone caulk to the glass. This will ensure that it doesn't leak over time or discolor.

Remove the glazing points from the rabbets, the grooves in the sash where the glass sits. If they are hard to chisel, hold the hand tool, such as a heating gun over them for a few minutes to soften them. If you're using a heating gun, be careful not to cause damage to the sash or its railings by placing the tool too tightly.

After the old points of glazing and putty have been removed prepare a bed for the new pane. Roll a piece of glazing compound between your hands, forming it to be about 1/2-inch thick. Place it into the rabbets where the glass will be placed. The glass must rest against the putty on both sides. If you need to gently tap your glass into the rabbet using your thumb.

If the new pane has a crack you can fill it with a solvent-based glue or silicone caulk prior to pressing it into the sash. Otherwise, you'll need to putty over the crack to form an impervious seal to keep water out. After the putty has dried clean the oily film from the glass and replace window Pane let it dry completely before you paint. If you paint before the putty is completely dry, it won't create a strong seal and may leak or discolor in time.

Paint

You may be concerned about replacing a broken piece of glass. It's true that replacing a single pane of glass doesn't have to be expensive if you do it on your own. In fact windows with double panes can be replaced for less than the cost of a professional.

If you are working with a large glass window first, ensure that it is securely fixed to the frame. By using the correct tools and techniques you can complete this task easily and fast.

When you are ready to begin, remove the old window pane. Take out the glazing points made of metal that are attached to it. These are tiny triangles of metal that function as "nails" that hold the window within the frame. They are buried beneath a glaze putty or bead which hardens into solid wedge which holds the wood frame in place and hides the sharp edges.

Once you have the old pane removed, clean up the surrounding frame and wood. Scrape off any paint that has been used, and sand the rabbet grooves that the glazing points were placed. Sand them down to bare wooden surfaces, allowing you to paint the frames with the same shade. After sanding the wood you can apply a layer flax oil. This will help to prolong the life of the frame.

The next step is to determine the size of the window's opening. You'll need to determine the horizontal and vertical dimensions of the entire opening as well as the thickness. To determine the exact dimensions of the new pane subtract 1/8 inch from both measurements. This will also allow for expansion and contraction of the glass during seasons of changes. Take these measurements to the 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.