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How to Replace Window Pane Window Panes

A damaged window pane could cause a lot of trouble. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows to benefit from greater comfort, a higher the value of resales and lower utility bills.

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

Glass

If your single pane windows are old damaged, cracked or deteriorating replacing them with more modern insulated or tempered glass can increase energy efficiency and replace window pane reduce noise while also preserving the historical integrity of older homes. The replacement of windows is easy and can be completed by homeowners with basic hand tools. You will also require an additional window pane, glazier's suggestions, pliers, and latex glazing putty. If needed, you can use a heatgun to warm the old putty. Wear safety glasses and gloves before you begin. Working with broken glass could cause serious injuries.

Take out any broken glass pieces that remain. It is recommended to use pliers for this however a flathead could work equally. Then, use a wood chisel or putty knife remove the remaining old putty from around the frame and the sash. Be careful not to damage the window sash. Be careful and slow. This can be done best on a ladder, not the ground. Also, you should have someone below the sash keep it in place.

Make sure that the window frame is ready to receive the new pane when you have removed the old putty. Measure the width and height of the opening in the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). Take these measurements to an hardware store or home center, and find a piece glass cut to size. You can cut the glass yourself if you possess the right tools.

After installing the new pane After installing the new pane, apply a small amount of caulking around the edge to make it weatherproof. Then, place a glazier's tip on the frame's opposite side to secure the pane in place. The points should not be tight enough to create friction between the frame and sash However, they should not be loose.

Before putting the putty on, make sure to knead it until it is soft and free of 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 another so that it is even and smooth.

Glazier's Points

The glazier’s points are small triangular metal pieces which help to secure the glass to the frame without causing any damage to the fragile surface. Learning how to use these hidden tiny pieces of help is simple and could save you money on professional installation or the cost of new glass.

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

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

Place the new replace window handle in the frame and press it into place firmly with your hand. Utilize the point of the chisel, or the back of the putty knife to tap the glazier's points, as illustrated in Figure 11. The glazier's point should be flush against the top edge of the pane and the shoulders should be just beneath that lip.

Apply a thin layer of glazing compound on the edges of the new glass and in the rabbet grooves, to seal and protect them. Let it dry and cure completely.

After the glazing compound dries it's time to put in the new window sash. First, saturate the wood with a thick coat of Linseed oil. This will prevent the new putty drying out or cracking due to the moisture it absorbs. Use a brush to apply this coat, or the tip of the blade. Then use the chisel on the back of the tool or the back of the handle to gently hammer the new sash or glazier's point into the rabbet grooves. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball hit or a rock thrown by error, or a tree falling can cause a broken or cracked window. Fortunately, the majority of windows can be repaired by simply placing a new piece in the proper place. The glass is held in place by a small metal clip, called a glazier’s point and putty. This compound is also referred to as glazing compound. Remove the old pane and clean the area using the rag, a scraper that is a pull type or a wood chisel. Wear gloves and safety glasses while doing this work. If the window is attached to the frame, you'll have to make use of a heat gun to soften the adhesive prior to taking it off.

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

Remove the glazing points from the rabbets, the grooves in the sash that the glass is. If they're hard to chisel, use a hand tool such as a heatgun over them to soften first. When using a heat tool, be careful to not damage the sash or its railings.

Once the old points of glazing and putty have been removed make a bed for the new pane. Roll a rope with glazing compound between your fingers, and make it about 1/2 inch thick. Then, push it into the rabbets in which the glass will sit. It is crucial that the glass rests against the putty in all places on both sides If you have to do so, gently tap the glass into the rabbet using your thumb.

If the new pane has a crack you can fill it with a solvent-based glue or silicone caulk prior pressing it into the sash. If not, you'll have to apply putty on the crack to create an impervious seal to keep water out. After the putty has dried remove the oily film off of the glass and allow it to dry completely before painting. Paint before the putty has dried completely. It won't form a good seal and could leak or discolor with time.

Paint

You might be worried about replacing a damaged piece of glass. The truth is, replacing a single pane of glass doesn't need to be expensive if you do it on your own. Even double-paned windows can be replaced for a fraction of the price it would cost for a professional.

If you're working with a large glass window first, ensure that it is securely attached to the frame. This task can be made relatively simple and fast with the right tools and techniques.

When you are ready to start with the removal of the window pane. Pry out the glazing points made of metal that are attached to it. These are basically small metal triangles that act as "nails" that hold the window in in the wood frame. They are placed beneath a layer of glazing putty that transforms into a solid formed wedge that holds the window firmly in place and conceals the edges.

After you have the old pane taken away, clean up the surrounding frame and wood. Scrape off any old paint, and sand the rabbet grooves that the glazing points were placed. These should be sanded down to the point of being bare, to allow you to paint them the same shade as the rest of the frame. After sanding the wood you can apply a layer flax oil. This will help to extend its life.

The next step is to measure the dimensions of the window opening. You'll need to take horizontal and vertical measurements of the entire opening, as well as the thickness of the old pane. To determine the exact size of the new pane subtract 1/8 inch from both measurements. This will also allow for expansion and contraction of the glass during seasonal change. Take these measurements to a hardware or home improvement store and ask them to cut you 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.