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How to Replace Window Panes

A damaged window pane could be a nuisance. It could also be a chance to upgrade your glass to energy-efficient or insulated windows and benefit from improved comfort, increased potential for resales, and less bills.

This is a project you could take on yourself for a fraction of the cost of hiring an expert. You'll only require the right tools and a few hours of your time.

Glass

Replace your single-paned windows using tempered or insulation glass to improve the efficiency of your energy, reduce noise, and maintain the original character of your older home. A majority of homeowners with hand tools can repair the window pane. You'll also require a replacement glass in windows window pane, glazier's tips, pliers, and latex glaze putty. If you need to you can make use of a heat gun to warm the old putty. Before beginning, wear gloves and safety goggles as working with broken glass can cause injuries.

Remove any broken glass pieces remaining. This can be done with pliers, though using flathead screwdrivers can work in the pinch. 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 break the window sash. Take your time and work slowly. It is a good idea to work using a sturdy ladder rather than the ground, and to have someone stand below the sash to help keep it steady.

After you have removed all the old putty, prepare the window frame to accommodate the new pane. Take measurements of the width and height of the opening for the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Take these measurements to a hardware store or home center, and find a piece glass cut to size. Alternatively, you can cut the glass yourself if you have the appropriate tools.

After putting the new pane in place After installing the new pane, apply a small amount of caulking along the edge to seal it against weather. Then, you can install a glazier's pointing on each side of the frame to secure the pane in the right place. The points shouldn't be too tight that they cause friction between the frame and sash however they shouldn't be loose.

Before applying the putty on the surface, gently knead it until it becomes soft and free from lumps. Then you can roll it into pencil-sized strips. The first strip should be placed in the corner of the frame, working from one corner to the other so that it is smooth and even.

Glazier's Points

The glazier's facets are small triangular pieces of metal that help secure glass into frames for windows without scratching or damaging the delicate surface. It's simple to learn how to use this secret tool, and you'll save money on the expense of an expert installation.

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

Note down the exact dimensions of the frame. Take these measurements to an hardware store or home center, and have the new pane cut slightly smaller than the frame's opening. This will ensure a snug fit and leave room for expansion and contraction.

Place the new pane into the frame and push it in with your hands. Make use of the chisel's point, or the edge of the putty blade to tap in the glazier's points, as shown in Figure 11. After you're done, the points should be flush with the top edge of the pane and the shoulders that are raised of the points should be below the rabbet's rim groove.

Apply a small amount of glazing compound on the edges of the new glass and in the rabbet grooves, to seal and protect them. Allow it to dry and cure fully.

Once the glazing compound has dried it's time to put in the new window sash. The first step is to coat the wood with an even layer of linseed. This will stop the new putty from drying out and cracking as it absorbs moisture. Apply this coat using a brush or the tip of your knife, then employ the chisel or back end of the putty knife to gently hammer the new sash and glazier's tips into the rabbet grooves. Repeat this procedure every 10 inches along the perimeter of the frame.

Putty

A baseball hit or a rock thrown in error, or a fallen tree could result in a broken or cracked window. Fortunately, replacements windows can be replaced by simply placing a new piece in the right place. The glass is held in place using a small metal clip called a glazier's point and putty, which is often called glazing compound. Before you install a new pane, first remove the old one and clean up the area with a rag and the pull-type paint scraper or an abrasive wood chisel. Wear protective glasses and gloves while you do this work. You'll need a heat gun in the event that the window is glued into the frame.

If you are planning to reinstall your original sash, you must remove the molding that supports the old pane. Then sand the sash to ensure it's smooth and ready to be re-caulked. Once the sash is reinstalled, you can apply a silicone caulk over the glass. This will ensure that it doesn't leak over time or discolor.

Remove the glazing points in the rabbets. These are the grooves in the sash where the glass is. If they're difficult to cut out, you can try holding a hand tool like a heat gun to soften them before you do. If you're using a heat gun, be careful not to cause damage to the railings or sash by using the tool too closely.

Prepare the bed for your new pane after you have removed the old putty and glazing points. Roll a rope of glazing compound between your hands, forming it into a 1/2-inch thick. Then, push it into the rabbets where the glass will rest. It is crucial that the glass is positioned against the putty on each side If you have to do so, gently tap the glass into the rabbet with your thumb.

If the new pane has a crack you can fill it with a solvent-based glass glue or silicone caulk prior pressing it into the sash. If the crack is not sealed, you will need to apply putty to keep water out. After the putty has dried clean the oily film off of the glass and allow it to dry completely before painting. Paint after the putty has completely dried. It won't make a strong seal and may be leaking or discoloring over time.

Paint

If you've had a broken window pane, you may be worried about the expense of a new one. But the truth is that replacing a single glass pane doesn't require a huge amount of money If you can do it yourself. Even double-paned windows can be replaced for a fraction of the price it would cost for a professional.

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

When you are ready to start with the removal of the window pane. Take out the glazing points made of metal that are attached to it. These are small metal triangles that act as "nails" to hold the window in place. They are submerged beneath a bead or glazing glue that hardens to solid wedge which holds the wood frame securely in place and hides the points.

After you have removed the old pane taken away, clean up the surrounding frame and wood. Scrape away any old paint and sand down the rabbet grooves, where the glazing points were. Sand them down to clean wooden surfaces, allowing you to paint the frames with the same color. After sanding the wood, apply a layer of flax oil. This will help extend its life.

Then, you need to measure the width of the window opening. You will need to take horizontal and vertical measurements of the entire opening as well as the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure that you get a precise 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 they will have 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.