Replacing French Door Glass
Replacing a broken pane of glass in a French door is a relatively simple DIY project. It involves cleaning the glass pane, removing trim or molding, and putting in an entirely new window pane.
French doors have multiple glass panes, which are separated by muntin bars. They are also known as Mullions. They are available in a variety configurations and may include triple-pane glass to improve energy efficiency, decrease noise and reduce glare.
How to replace a damaged Pane of Glass
Wear rubber gloves and safety goggles prior to replacing the glass. This will shield you from any broken glass shards that could fall during the process. Work in a space that is open like a garage and keep your children out. It is best to remove the window frame from the sill for greater accessibility and mobility, but you can also replace a window without taking the entire window out of the frame.
Start by scraping off any old glazing compound or caulking around the edges of the sash with a putty knife. Be careful not to scratch the wood molding that holds the window in place as you'll need it later to hold the new pane.
If you're working with a window made of steel, the window may be secured by metal glazing points. These points, along with the old putty, will require removal before you can take the pane from the frame. A paint scraper or tool like a chisel will work, but if you find that the putty is difficult to get out, slowly soften it with a heat gun. Place the heat gun one inch away from the glass, then move it forwards and backwards to spread the warmth. Double-up the aluminum foil and place it on the adjacent panes. This will stop them from breaking due to the heat.
After removing the old glass, use a damp cloth and wipe the inside of the window sash in order to remove any dirt or dust. Now you can install a new pane of glass.
Take measurements of the width and height to determine the dimensions of the glass. To order a new glass pane that fits into the door frame, you need to take these measurements and subtract an eighth inch from each side. Many hardware stores will cut a piece of glass for you if you supply the measurement.
Warm up a handful of putty and then roll it into a 3/4-inch wide rope. Place the putty on one side of the rabbet, and then rest your putty knife's blade at a 45-degree angle with the frame's rabbet. The knife should be pulled along the glass's edge in a smooth, straight line to cut a piece of the pane. Repeat the process for the other edges of the pane. Then, scrape off the excess putty.
Take the broken Pane
A broken glass pane in a French-style door not just an eye sore, but it can also pose a security risk. It's simple to replace a glass pane on a French-style door, and it's typically less expensive than replacing the entire door panel. The majority of homeowners are able to complete the task on their own, however professional assistance is available to those who require specific tools or know-how.
Begin by taking out any cracked or broken fragments of the frame. Wear safety goggles and gloves to stop glass shards from getting in your eyes or on your face. Then, clean the glass pane's opening to remove any residual caulking or putty that was used to keep the old pane in place.
Next, you need to remove any molding or trim that was holding the glass in place. It could be difficult to pry the molding out. This is why it's best to wear your protective gear, and to have someone assist you with the prying if necessary. Label the items you are removing so you can put them back in their original positions.
The installation of the new glass is simple once the molding has been removed. Visit a glass store and measure the glass's opening. It is recommended to purchase safety glass for your French door, because it will not break easily in the event of a break.
When you're ready to put in the new piece of glass ensure that it's placed properly in the opening. Apply a thin coating of clear silicone caulk to the edge of the glass.
You can change the molding after the caulk is dry. If the nails that were originally used didn't penetrate the molding, you can hammer new wire nails into the holes created by the old nails. To prevent the nails from breaking the molding, you should drill the holes prior to drilling them. A well-stocked hardware store carries tiny bits that can be used to drill holes.
How to cut a new Pane Of Glass
Before you purchase a new pane of glass, make sure the frame's dimensions and the edges of the window are even. You may have to adjust spring clips or the metal triangulars that hold it in place if you notice gaps. You also need to ensure that the new pane is a appropriate size for the opening. If it's not large, you could experience leaks or other issues after it's installed.
The first step is preparing the work surface. Scrape the old compound off the frame's sides using a putty blade expose the wood. If the rabbets are too rough to smooth with a putty knife then lightly sand them, and brush on an exterior primer. This will stop the new glaze from absorption of moisture from the wood and reduce its life.
After the frame has been cleaned and prepared, you can knead a handfull of putty until it becomes soft and malleable. Use the putty knife apply a thin layer of it to the inside corners of the rabbets, forming an even bed for the glass to rest against. Repeat the process for the other exposed edges of the rabbets.

When the putty is dry, remove any remaining metal glazing points from the grooves within the sash. Wear safety goggles prior to trying to remove the points to protect yourself from shards of glass. Heating guns with low settings can be used to gently warm the metal and loosen it so that you can remove it with pliers.
When the frame and glass are ready, test-fit it by sliding it into place. Make any necessary adjustments prior to fixing it with spring clips or steel triangles. Make sure that the gap between the frame and glass is consistent on all sides. Test the movement of the window sash and ensure the new pane will not hinder the opening or closing. If you encounter any issues regarding the installation, consult an expert who specializes in restoration, who can help you restore and maintain your historic home.
Install the Pane of Glass
Test-fit the glass pane to ensure that it fits properly before putting it in place. Measure the height and width of the window opening by measuring it to the outside edge of the L channels. Subtract 1/8 inch from each measurement to find the size of glass you need to purchase. It is easier to install the pane if you slightly undersize it. This will also allow for seasonal expansion and contraction of the frame. You can bring your measurements to the hardware store or the home centre and they will cut a piece of glass for you. french door glass replacement can cut the glass yourself in the event that you have a large sheet on hand.
After removing the old glass pane, clean the window sash grooves. Remove any glazing points that were used to support the old pane. This can be accomplished using an e-type paint scraper or a chisel. If the grooves contain an abundance of putty that is hardened, you can gradually soften it using a heat gun. Cover the windows and moldings around them with aluminum foil in order to shield them from heat.
Scrape and sand the rabbets in which the glass sits, brushing an exterior primer on them to prevent the putty from drawing out its natural oils and thus reducing its life. Also, clean the grooves in the sash.
Knead a small amount of putty until it's warm and flexible and then press it into the rabbets in which the glass will go. At this stage, neatness is not important. Press the new pane in the rabbets and then move it with your fingers.
If there are any holes in the frame of wood around the glass, you can fill them with silicone caulk before installing the new pane of glass. If the frame is equipped with other fixing mechanisms, such as L channels, you can use the hammer to pry them from the sash grooves. Examine the frame for shards of glass that may have shattered during removal, and take them out of them prior to continuing. To keep pests and water from entering the house put a clear silicone caulk to the frame's bottom edge where it meets floor.