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How to Replace Window Panes

A damaged window pane could cause a lot of trouble. This can be an opportunity to upgrade your windows to energy efficient or insulated ones, and reap advantages like improved comfort, increased resale values and reduced utility bills.

You can do it yourself for less than what it would cost to hire an expert. You'll need only the proper tools and a few minutes of your time.

Glass

If your single-pane windows are outdated, deteriorating or broken replacing them with modern glass that is tempered or insulated can improve energy efficiency and reduce noise while also preserving the original character of older homes. The replacement of windows is easy and can be completed by homeowners with basic hand tools. You'll also require an extra window pane, glazier's suggestions, pliers, and latex glaze putty. If you need to you can use a heating gun to warm the old putty. Wear safety goggles and gloves prior to beginning. Working with broken glass could result in serious injuries.

Begin by removing any broken pieces of glass. It is best to use pliers for this however a flathead could work equally. Then, use a wood chisel, or putty knife, to remove the remaining old putty around the frame and sash. Take your time and work slowly, taking care not to break the existing window sash. It is recommended to work on a sturdy ladder instead of the ground and to place someone on the sash to help keep it steady.

Once 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, subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be taken to an hardware or home centers store to have cut a piece of glass that is in stock to the correct size. You can also cut the glass yourself if have the appropriate tools.

After putting in the new pane After installing the new pane, apply a small amount of caulking around the edge to make it weatherproof. Then install a glazier's point on the frame's opposite side to secure the pane in place. The points shouldn't be so tight as to cause friction between the sash and frame but they should not be too loose.

Before putting the putty on, make sure to knead it until it's soft and free of lumps. Then make it into pencil-sized strips. Apply the first strip in the corner of the frame, working from one corner to the other to ensure it is smooth and even.

Glazier's Points

The glazier's facets are small triangular pieces of metal that help secure glass into the frame of a window without scratching or damaging the delicate surface. Understanding how to use these tiny helpers is simple and can save you money on professional installation or the cost of new glass.

After the old putty as well as the glazier's points have been removed Clean the frame thoroughly using a utility knife to remove any remaining traces. Lightly sand the wood in the rabbet grooves, if necessary, to smooth out rough areas. If you decide to sand the wood, be sure to protect it by using painter's tape to prevent accidental damage.

Measure the empty frame's dimensions and note down precise measurements. Take these measurements to a hardware store or a home center and request that the new pane cut smaller than the frame's opening. This will ensure a snug fit, and allow for expansion and contraction.

Place the new pane into the frame and push firmly using your hands. Then use the point of your chisel, or the back end of the putty knife to make a tap on the glazier's points as shown in Figure 11. The glazier's points should be aligned with the top edge of the pane and the shoulders raised should be just beneath that lip.

Apply a thin bead of glazing compound over the edges of the glass that has been made and into the rabbet grooves to seal and protect them. Let it dry and cure completely.

Install the new window sash once the glazing compound has dried. The first step is to coat the wood with a heavy coat of Linseed oil. This will stop the new putty from taking up moisture and deteriorating and cracking over time. Apply the coating using a brush this coat, or the point of the putty blade. Then use the chisel on the back of the tool or the back of the handle to gently hit the new sash, or glazier's point into grooves of the rabbet. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball hit, a rock thrown in error or a branch falling could result in a broken or cracked window pane. Fortunately, windows can be easily replaced by simply putting a new piece of glass in its the proper place. The glass is held in place with small clips made of metal called a glazier's point, and putty, which is often called glazing compound. Remove the old pane and clean the area with a rag, a pull-type scraper, or a wood chisel. Wear safety glasses and gloves while you do this work. You'll need a heat gun in the event that the window is glued to the frame.

If you are planning to install your original sash, you must remove the molding that supports the old pane. Sand the sash until it's flat and ready for new caulk. Once the sash is re-installed, apply a new caulk made of silicone around the glass to ensure that it won't leak or discolor in time.

Take the glazing points out of the rabbets and the grooves in the sash, where the glass sits. If they're hard to chisel, use an instrument like a heat gun over them to soften first. If you're using a heat gun, be cautious not to cause damage to the railings or sash by using the tool too tightly.

Once the old points of glazing and putty are removed, prepare a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it about 1/2 inch thick. Then, you can press it into the rabbets, where the glass will be. It is crucial that the glass is positioned against the putty on both sides, so if you need to, lightly tap the glass into the rabbet using your thumb.

If the new pane is cracked, you can apply a silicone caulk or glass glue that is based on solvents to seal the crack before pressing it into the sash. If the crack isn't sealed, you'll need to apply putty to keep water out. After the putty has dried then clean the oily film off the glass with a rag and allow it to dry completely before painting. If you paint before the putty has completely dry, it won't form a strong seal and may discolor or leak in time.

Paint

If you've experienced a broken window pane, you may be concerned about the expense of a new one. However, replacing one glass pane does not require a huge amount of money when you do it yourself. In fact even windows with double glazing replacement window panes can be replaced at less than the cost of a professional.

First, if you are working on a large-sized window, ensure that it is securely fixed to the frame. This task can be made relatively simple and quick with the proper tools and techniques.

When you are ready to begin, remove the old window pane. Pry out the metal glazing points that are attached to it. These are tiny triangles of metal that act as "nails", holding the window in place. They are buried under a bead of glazing putty that transforms into a solid moulded wedge which holds the window panel replacement windows and doors (Read Much more) in place and conceals the points.

After taking off the old pane clean the frame and the wood. Scrape off any paint that has been used, and sand the rabbet grooves that the glazing points were. They should be sanded to bare wood 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 determine the size of the window's opening. You'll need to determine the vertical and horizontal dimensions of the entire opening, as well as the thickness. Subtract 1/8 inch from each measurement to ensure you get a precise size for the new pane. This will also allow for expansion and contraction of the glass in times of seasonal change. You can take these measurements to a hardware or home improvement shop 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.