How to Replace Window Panes

A damaged or cracked window can cause a lot of trouble. It can also be an opportunity to upgrade your glass to energy-efficient or insulated windows to enjoy benefits such as greater comfort, a higher potential for resales, and less costs.

It's a project you can tackle yourself at a fraction of the cost of hiring an expert. You'll only require the right tools and a few hours of your time.

Glass

If your single-pane windows are old damaged, cracked or deteriorating, replacing them with newer glass that is tempered or insulated can increase energy efficiency and reduce noise while preserving the historic integrity of older homes. The process of replacing a window pane is relatively simple and can be done by most homeowners who possess basic hand tools. Alongside a replacement pane, the following tools are required for the replacement glass In windows process: latex glazing putty Glazier's points; pliers and a heat gun for warming the old putty, if needed. Wear safety glasses and gloves before you begin. Working with broken glass could cause serious injuries.

Take away any broken glass pieces that remain. This is best accomplished with the help of pliers though using a flathead screwdriver can also be used in the pinch. Utilize a wood chisel or putty knives, to take away any old putty that remains around the frame and the window sash. Take your time and work slowly making sure not to break the current window sash. This is best done on an elevated ladder, not on the ground. Also, you should have someone on the ground to keep it in place.

Make sure that the window frame is ready to accommodate the new pane once you have removed the old putty. To allow for seasonal expansion or contraction by subtracting 1/8 inch from the measurements of the width and height. Bring these measurements to the nearest hardware store or home center, and have a piece of stock glass cut to size. Alternatively, you can cut the glass yourself if have the appropriate tools.

After putting in the new glass After installing the glass, apply caulking on the edges. This will make the glass weatherproof. Install a glazier’s point on both sides of the frame. This will secure the pane. The points shouldn't be tight enough to cause friction between the frame and the sash, but they should also not be loose.

Before applying the putty to the surface, knead thoroughly until it becomes soft and free of lumps. Make it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from one corner to another to ensure it's even and smooth.

Glazier's Points

The glazier's points are tiny triangular metal pieces which help to secure the glass to the frame without damaging the delicate surface. Learning how to use these hidden tiny pieces of help is simple and can save you money on professional installation or the cost of buying new glass.

After taking off the old putty, glazier points and any remnants clean the frame thoroughly using an utility knife. If needed it is necessary to lightly sand the wood in the grooves of the rabbets to smooth rough spots. If you decide to sand wood, protect it with painter’s tape to avoid accidental damage.

Take measurements of the empty frame and write down accurate measurements. Take these measurements to an hardware store or home center and request that the new pane made slightly smaller than the frame's opening. This will ensure a snug fit and will allow room for expansion and contraction.

Place the new window in the frame and push it in place with your hand. Then, you can use the point of your chisel or the back end of the putty knife to make a tap on the glazier's points, as shown in Figure 11. The glazier's points should sit flush against the top edge of the pane and the shoulders raised should be just below the lip.

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

Once the glazing compound has dried, you're ready to install the new window sash. First, saturate the wood with a heavy coat of linseed oil. This will keep the new putty from soaking in the moisture and deteriorating and cracking over time. Use a brush to apply this coat, or the tip of the putty blade. Then, use the chisel on the back of the putty tool or the back of the putty handle to gently smash the new sash or glazier's point into grooves of the rabbet. Repeat this procedure every 10 inches along the frame's perimeter.

Putty

A baseball thrown or a rock thrown by error, or a tree falling can result in a cracked or cracked window pane. Fortunately, the majority of windows can be easily replaced by simply putting a brand new piece in the proper place. The glass is held in place by tiny metal clips known as a glazier's point and putty, often called glazing compound. Before you install a new pane, first remove the old one and clean up the area using the help of a rag, an abrasive scraper that is a pull type or an abrasive wood chisel. Wear protective glasses and gloves when you work. You'll need a heat gun in the event that the window is glued to the frame.

If you are planning to replace the original sash in the future, take care to remove the molding pieces that secure the old pane. Then you can sand the sash down to make sure it's flat 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 get soiled or discolor over time.

Remove the glazing points from the rabbets. These are the grooves in the sash, where the glass is located. If they're difficult to work out, try placing an instrument like a heat gun over them to soften them first. When using a heating tool, be careful to avoid damaging the sash's railings and sash.

After the old glazing points and putty have been removed, make a bed for the new pane. Roll a rope made of glazing compound between your fingers and make it around 1/2 inch thick. Place it into the rabbets where the glass will be placed. The glass must be positioned against the putty on both sides. If you need to, lightly tap your glass into the rabbet with your thumb.

If the new pane has cracked, you can use a silicone caulk or a glass glue made from solvents to cover the crack before pressing it in the sash. If not, you'll have to putty over the crack to create a tight seal and keep water out. After the putty has dried clean the oily film from the glass and allow it to dry completely before you paint. If you paint before the putty is completely dry, it won't create a strong seal and may discolor or leak in time.

Paint

If you've had a broken window pane, you might be worried about the expense of replacing it. In reality, replacing a single pane glass doesn't need to be costly when you do it on your own. In fact even windows with double glazing windows replacement panes can be replaced for a fraction of the cost of an expert.

If you're working with a large glass window first ensure it is securely attached to the frame. This job is relatively easy and fast with the appropriate tools and techniques.

If you're ready to begin taking off the old window by prying 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 in the frame. They are submerged beneath a bead or glazing putty that sets to form solid wedge that holds the wood frame firmly in position and conceals the edges.

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

Next, measure the dimensions of the window opening. You will need to measure the vertical and horizontal dimensions of the entire opening as well as the thickness. Subtract 1/8 inch from each measurement to ensure you get a precise size for the new pane. This will allow for seasonal changes in the glass. 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.