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How to Replace Window Panes

A damaged window pane could cause a lot of trouble. This could be an opportunity to upgrade to energy-efficient windows or insulated ones to enjoy benefits such as improved comfort, increased resale value and lower utility costs.

It's a project you can take on yourself for less than the cost of hiring an expert. You'll only require the proper tools and a few minutes of your time.

Glass

If your single-pane windows are outdated damaged, cracked or deteriorating, replacing them with newer glass that is tempered or insulated can increase energy efficiency and decrease noise while maintaining the historical integrity of older homes. A majority of homeowners with hand tools can replace the window pane. Alongside a replacement pane, the following components are needed for the replacement process: latex glazing putty glazier's points; pliers; and an electric heater to warm the old putty, if necessary. Wear safety goggles and gloves prior to beginning. Working with broken glass can cause serious injuries.

Begin by removing any broken pieces of glass. This is best accomplished with pliers, but a flathead screwdriver can also be effective in a pinch. Then, use a wood chisel or putty knife to remove the remaining old putty around the frame and sash. Work slowly and carefully making sure not to break the existing window sash. This can be done best on a ladder, not the ground. Also, ensure that someone lower to keep it in place.

Make sure that the window frame is ready to accept the new pane once 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 the nearest hardware store or home center and get a piece of stock glass cut to size. Alternatively, you can cut the glass yourself if have the right tools.

After installing the new glass After installing the glass, apply caulking on the edges. This will make the glass weatherproof. Install a glazier's pointing on both sides of the frame. This will ensure the pane. The points should not be so tight as to cause friction between the sash and replacement windows the frame but they shouldn't be too loose.

Before applying the putty on the surface, gently knead it until it is soft and free of lumps. Roll it into pencil-sized strips. Apply the first strip in the corner of the frame, moving from one corner to the other to ensure it is smooth and even.

Glazier's Points

The glazier’s points are small triangular pieces of steel that allow glass to be secured to the frame without causing any damage to the fragile surface. Learning how to use these hidden little helpers is easy and can save you money on a professional installation or the cost of buying new glass.

After the old putty and glazier's points are removed, thoroughly clean the frame with a utility knife to eliminate any remaining traces. Lightly sand the frame in the rabbet grooves, if necessary, to smooth out rough areas. If you do sand your wood, make sure to protect it by using painter's tape to prevent accidental damage.

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

Place the new window in the frame and press it in place using your hand. 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 point should be aligned with the top edge of the pane and the shoulders should be just beneath 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. Allow it to dry and cure completely.

After the glazing compound dries 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 sucking up moisture and deteriorating and cracking with time. Apply the coat using a brush or the tip of your knife, then use the chisel, or the back end of the putty knife to gently hammer in the new sash and glazier's points into the rabbet grooves. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball thrown at you or a rock that is errant or a falling branch can cause a window pane to break or crack. The majority of windows can be replaced easily by putting in a new 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 windows pane, first remove the old one and clean the area using an abrasive and a pull-type paint scraper or an abrasive wood chisel. Wear safety glasses and gloves when you work. If the window is glued to the frame, you'll have to use a heat gun to soften the adhesive before cutting it loose.

If you're planning to install the original sash in the future, take care to remove any pieces of molding that hold the old pane in place. Sand the sash until it's flat and ready to receive new caulk. Once the sash is installed and sanded, apply a fresh silicone caulk to the glass to ensure that it will not leak or change color in time.

Remove the glazing points in the rabbets. These are the grooves on the sash, where the glass is. If they're difficult to chisel, use an instrument like a heat gun over them to allow them to soften before. When using a heating tool, be sure to not scratch the sash or its railings.

Prepare a bed for your new pane after removing the old glaze and putty. Roll a rope 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 sits on the putty in all places on each side If you have to, lightly tap the glass into the rabbet with your thumb.

If the new pane has a crack then you can seal it with a solvent-based glass glue or silicone caulk prior pressing it into the sash. Otherwise, you'll need to apply putty over the crack to form a tight seal and keep water out. After the putty has dried remove the oily film off the glass and allow it to dry completely before you paint. Paint before the putty has dried completely. It won't form a good seal and could be leaking or discoloring over time.

Paint

You might be worried about replacing a broken pane of glass. The truth is, replacement windows replacing a single pane of glass doesn't have to be costly even if you do it your own. In fact, even a double-pane window can be replaced for only a fraction of the cost of a professional.

If you are working with large glass windows first ensure it is securely attached to the frame. This task can be done relatively easy and fast using the appropriate tools and techniques.

When you're ready to start with the removal of the old window replacement companies by prying out the metal glazing points that are attached to it. These are small metal triangles that function as "nails", holding the window in place. They are placed under a glaze putty or bead which hardens into an unbreakable wedge that holds the frame in place and conceals the edges.

After removal of the old pane clean the frame and wood. Scrape off any old paint, and sand the rabbet grooves where the glazing points were. Sand them to bare wooden surfaces so you can paint the frames with the same color. After sanding the wood you can apply a layer flax oil. This will help prolong the life of the frame.

The next step is to determine the width of the window opening. You will need to measure the vertical and horizontal 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. Bring these measurements to your local hardware or home improvement store and have 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.