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How to Replace Window Panes

A cracked window pane can be a nuisance. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows and reap benefits like improved comfort, increased the value of resales and lower utility bills.

It's a project you can tackle yourself at less than the cost of hiring a professional. You'll only require the appropriate tools and a few minutes of your time.

Glass

Replace Window Pane your single-paned windows with tempered insulated glass to increase the efficiency of your energy, reduce noise, and protect the historic integrity of your old home. The process of replacing the window pane is simple and can be done by homeowners with basic hand tools. You'll also require an extra window pane, glazier's tips, pliers, and latex glaze putty. If needed you can use a heatgun to warm the old putty. Wear safety goggles and gloves prior to starting. Working with broken glass could result in serious injuries.

Begin by removing any broken pieces of glass. This can be done with a pair of pliers, replace Window Pane though using a flathead screwdriver may be effective in the pinch. Use a wood chisel, or putty knives to remove any old putty remaining around the frame and window sash. Be careful and slow, taking care not to break the current window sash. This can be done best on an elevated ladder, not on the ground. Also, have someone on the ground to keep it in place.

Once you have removed all of the old putty, you can prepare the window frame to fit the new pane. Find the width and the height of the opening for the sash, subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be taken to a home center or hardware store to get cut a piece of glass that is in stock to the correct size. You can cut the glass yourself if you have the right tools.

After putting in the new glass Apply caulking around 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 should not be too tight that they cause friction between the frame and the sash However, they should not be loose.

Before applying the putty on the surface, knead thoroughly until it becomes soft and free from lumps. Then, roll it into pencil-size strips. Apply the first strip to the corner of the frame, moving from one corner to the other so that it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of metal which help to secure glass into a window frame without scratching or damaging the fragile surface. Knowing how to use these little helpers is easy and could save you money on professional installation or the cost of buying new glass.

After the old putty and glazier's points are removed and the frame is thoroughly cleaned using a utility knife to remove any remaining traces. Lightly sand the frame in the rabbet grooves if needed to smooth out rough areas. If you decide to sand the wood, be sure to protect it with painter's tack to avoid accidental damage.

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

Place the new pane in the frame and press it into place firmly by using your hands. Make use of the point of the chisel, or the back of the putty blade to tap the glaziers' points as illustrated in Figure 11. The glazier's point should be in line with the top edge of the pane and the shoulders raised should be just below that lip.

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

When the glazing compound is dry and the glazing compound is dry, you can install the new window sash. The first step is to coat the wood with a heavy coat of Linseed oil. This will stop the new putty drying out or cracking when it absorbs moisture. 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 hit the new sash, or glazier's point into grooves of the rabbet. Repeat this procedure every 10 inches around the perimeter of the frame.

Putty

A baseball hit or a rock thrown by error, or a tree falling could result in a broken or cracked window pane. The majority of windows can be repaired easily by simply putting in a fresh piece. The glass is held in place by small clips made of metal called a glazier's point, and putty, often called glazing compound. Before you install a new pane, first get rid of the old one and clean the area with a rag and the pull-type paint scraper or an abrasive wood chisel. Wear gloves and safety glasses while working. You'll require a heat gun in the event that the window is glued to the frame.

If you plan to reinstall the original sash in the future, take care to remove any molding pieces that hold the old pane in place. Sand the sash until it's flat and ready for new caulk. After the sash has been re-installed, apply a new caulk made of silicone around the glass to ensure that it doesn't swell or fade in time.

Remove the glazing points in the rabbets. These are the grooves on the sash, which is where the glass is located. If they're difficult to work out, try holding a hand tool like a heat gun to soften them first. When using a heating tool, make sure to not damage the sash or its railings.

Create a bed for your new pane after you have removed the old putty and glazing points. Roll a piece of glazing compound between your hands, shaping it into a 1/2-inch thick. Then, push it into the rabbets where the glass will sit. The glass should rest against the putty on both sides. If you need to you want to tap your glass lightly into the rabbet using your thumb.

If the new pane is cracked, you can apply the silicone caulk or glass glue based on solvents to seal the crack before pressing it into the sash. In other cases, you'll need to apply putty on the crack to form an impervious seal to keep water out. When the putty dries then clean the oily film off the glass using a rag and allow it to completely dry before painting. If you paint before the putty has completely dry, it will not form a strong seal and may discolor or leak over time.

Paint

You might be worried about replacing a damaged piece of glass. But the truth is that replacing one glass pane does not require a huge amount of money when you do it yourself. In fact even windows with double glazed window replacement panes can be replaced at only a fraction of the cost of an expert.

First, if you're working on a large-sized window, make sure it is securely fixed to the frame. This job can be made relatively simple and quick with the right tools and techniques.

When you're ready to start with the removal of the old window pane by prying out the glazing points of metal that are attached to it. These are tiny metal triangles that act as "nails", holding the window in the frame. They are submerged beneath a layer of glazing putty that is then cured to form a solid, formed wedge that holds the window firmly in place and hides the window's points.

After you have the old pane removed, clean up the surrounding frame and wood. Scrape off any paint and sand down the rabbet grooves, where the glazing points were. Sand them down to bare wooden surfaces so you can paint the frames the same color. After sanding, apply a coat of flax oil to the wood's surface to prolong its life.

Next, measure the width of the window's opening. You'll need to take vertical and horizontal measurements of the entire opening and also 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. You can take these measurements to a hardware or home improvement shop and get 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.