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How to Replace Window Pane Window Panes

A damaged or cracked window is a nuisance. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows and enjoy benefits such as more comfort, higher resale value and reduced utility costs.

It's a task you can take on yourself for only a fraction of the cost of hiring a professional. It requires the right tools and only an hour or two of your time.

Glass

Replace your old single-paned windows with tempered insulate glass to improve energy efficiency, reduce noise, and preserve the original character of your old home. The process of replacing windows is easy and can be accomplished by homeowners with basic hand tools. You'll also require an additional window pane, glazier's suggestions, pliers, and latex glaze putty. If you need to you may use a heatgun to warm the old putty. Wear safety glasses and gloves prior to starting. Working with broken glass could cause serious injuries.

Remove any broken glass pieces that remain. It is recommended to use pliers for this however, a flathead may be useful as well. After that, use a wood chisel or putty knife to take the remainder of the old putty from around the frame and the sash. Be careful to not scratch the window sash. Be careful and slow. This is best done on a ladder, not on 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 glue. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of width and height. Bring these measurements to the nearest hardware store or home center, and find a piece glass cut to size. Alternately, you can cut the glass yourself if you have the appropriate tools.

After installing the new glass After installing the glass, apply a small amount of caulking on the edges. This will make the glass weatherproof. Then, you can install a glazier's pointing on each side of the frame to secure the pane in its place. The points should not be so tight as to cause friction between the sash and the frame however they shouldn't be loose.

Before applying the putty to the surface, knead thoroughly until it is smooth and free of lumps. Then you can roll it into pencil-sized strips. Apply the first strip to the corner of the frame. Work from one corner to another and ensure that it is even and smooth.

Glazier's Points

The glazier's points are small triangular pieces of metal which help to secure the glass into the window frame without damaging the delicate surface. It's easy to understand how to use this secret tool, and you'll save money on the expense of a professional installation.

Once the old putty and glazier's points are removed, thoroughly clean the frame with a knife to get rid of any remaining residue. If necessary you can lightly sand the wood in the rabbet grooves to smooth out rough areas. If you do sand your wood, ensure you protect it with painter's tape to avoid accidental damage.

Take measurements of the empty frame and note down precise measurements. Bring these measurements to a hardware store or home center and have the new pane cut slightly smaller than the frame's opening. This will ensure that the pane fits comfortably and allows for expansion and contraction.

Place the new pane in the frame and press it into the frame using your hand. Make use of the chisel's point or the back of the putty knife to smudge the glazier's points as shown in Figure 11. When you're done taping, they should be level with the top edge of the pane. the shoulders that are raised of the points should be just below the lip of the rabbet groove.

Apply a thin layer of glazing compound to the rabbet grooves as well as the edges of new glass. This will seal and protect the edges. Allow this to dry and cure fully.

Install the new window sash when the glazing compound has dried. First, coat the wood with a thick coat of Linseed oil. This will stop the new putty from drying out or cracking due to the moisture it absorbs. Apply the coat using a brush or the tip of your knife, then employ the chisel or back end from the putty knife to gently press the new sash and glazier's point into the rabbet grooves. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball that is thrown, an errant rock or a fallen branch can cause a window pane to break or crack. Most windows can be replaced easily by simply putting in a fresh piece. The glass is held in place with a small metal clip called the glazier's pointed and putty, which is often called glazing compound. Remove the old pane and clean the area with an abrasive, pull-type scraper or wood chisel. Wear protective glasses and gloves when working. If the window is secured to the frame, you'll have to make use of a heat gun to soften the adhesive prior to taking it off.

If you are planning to install the original sash, replace window pane take off the molding that supports the old pane. Then, sand the sash to ensure it's smooth and ready for a new caulk. Once the sash is re-installed, apply a new caulk made of silicone around the glass to ensure that it will not leak or change color in time.

Remove the glazing points from the rabbets, or the grooves in the sash that the glass sits. If they're hard to cut, place the hand tool, like a heat gun over them for a few minutes to soften them. When using a heat tool, be careful to not damage the sash and its railings.

Prepare a bed for your new pane after removing the old glaze and putty. Roll a rope made of glazing compound between your fingers and then make it about 1/2 inch thick. Then, you can press it into the rabbets where the glass will rest. The glass must be positioned against the putty on both sides. If you need to, lightly tap your glass into the rabbet using your thumb.

If the new pane is cracked, you can cover it with a solvent-based glue or silicone caulk prior to pressing it into the sash. In other cases, you'll need to apply putty on the crack to form a tight seal and keep water out. Once the putty is dry, Replace Window Pane wipe the oily film off the glass and let it dry completely before painting. Paint before the putty is completely dry. It won't create a solid seal and could be leaking or discoloring over time.

Paint

If you've experienced a broken window pane, then you may be worried about the expense of replacing it. However, replacing one glass pane does not have to break the bank if you do it yourself. In fact, even a double-pane window can be replaced for a fraction of the cost of a professional.

If you are working with large glass windows, first 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 are ready to start taking down the old window pane. Take out the metal glazing points attached to it. These are tiny metal triangles that function as "nails" to hold the replacement window handle within the frame. They are submerged under a bead of glazing putty that transforms into a solid formed wedge that holds the window firmly in place and hides the window's points.

After removing the old pane, clean the frame and the wood. Scrape off any paint that has been used and sand the rabbet grooves in which the glazing points were. They should be sanded to bare wood, so that you can paint them the same shade as the rest of the frame. After the sanding process, apply a coat of flax oil to the wood's surface to extend the life of the frame.

Then, take measurements of the dimensions of the window opening. You'll need to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure that you have the exact size for the new pane. This will allow for seasonal changes in the glass. You can bring these measurements to a hardware or home improvement store 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.