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How to replace Window pane Window Panes

A damaged window pane can be an inconvenience. This could be an opportunity to upgrade your windows to energy efficient or insulated ones, and reap benefits such as improved comfort, increased resale value and lower utility costs.

You can do it yourself for a less than what it would cost to employ an expert. It requires the right tools and only an hour or two of your time.

Glass

Replace your single-paned windows with tempered or insulate glass to improve energy efficiency, reduce noise, and preserve the original character of your older home. The process of replacing a window pane is relatively easy and can be completed by anyone with basic hand tools. You'll also require an additional window sash replacement pane, glazier's tips pliers, and latex glaze putty. If you need to, you can use a heating gun to warm the old putty. Before starting, wear protective gloves and goggles since working with broken glass could cause injuries.

Begin by removing any broken pieces of glass. This can be done with pliers, however, a flathead screwdriver may be effective in a pinch. Then, use a wood chisel or putty knife remove the rest of the old putty from around the frame and the sash. Take your time and work slowly, taking care not to break the existing window sash. It is a good idea to do this on a sturdy ladder rather than the ground, and to have someone stand below the sash to help hold it steady.

After you have removed all of the old putty, it is time to prepare the window frame to fit the new pane. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. These measurements can be taken to a home center or Replace window pane hardware store to have cut a piece of glass stock to the proper size. You can also cut the glass by yourself if you have the appropriate tools.

After putting in the new pane, run a small bead of caulking around the edges to ensure it is weatherproof. Then, place a glazier's tip 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 applying the putty knead it thoroughly until it's soft and free of lumps. Then you can roll it into pencil-sized strips. The first strip should be glued to the frame's corner. Work from one corner to another to ensure it's even and smooth.

Glazier's Points

The glazier's points are tiny triangular pieces of steel which help to secure the glass into the window frame without causing damage to the delicate surface. Learning how to use these hidden tiny pieces of help is simple and could save you money on a professional installation or the cost of purchasing new glass.

After taking off the old putty, glazier points, and any other leftovers, clean the frame thoroughly with an utility knife. Lightly sand the frame in the rabbet grooves if needed to smooth rough areas. If you decide to sand wood, cover it with painter's tape to avoid accidental damage.

Measure the empty frame's dimensions and write down accurate measurements. These measurements can be brought to an hardware or home centers store, and the new frame will be cut to a smaller size. This will ensure a tight fit and leave room for expansion and contraction.

Place the new pane into the frame and push it into the frame using your hand. Use the point of the chisel, or the back of the putty knife to tap the glazier's points as illustrated in Figure 11. When you're done taping, they should be level with the top edge of the pane. the shoulders of the points should be below the rabbet's rim groove.

Apply a thin bead of glazing compound on the edges of the new glass and in the rabbet grooves to seal and protect them. Allow this to dry and cure completely.

When the glazing compound is dry it's time to put in the new window sash. First, you need to coat the wood with an even layer of linseed. This will prevent the newly-created putty drying out or cracking due to the moisture it absorbs. Use a brush to apply this coat, or even the tip of the blade. Then, use the chisel on the back of the putty tool or the back of the handle to gently smash the new sash or glazier's point into rabbet grooves. Repeat this procedure every 10 inches along the frame's perimeter.

Putty

A baseball hit or a rock thrown by error, or a fallen tree can cause a broken or cracked window pane. Fortunately, windows can be repaired by simply putting a new piece in the right place. The glass is held in place by small clips made of metal called the glazier's pointed and putty, often called glazing compound. Remove the old pane and clean the area with a rag, a pull-type scraper or wood chisel. Wear gloves and safety glasses while working. You'll need a heat gun in the event that the window is glued into the frame.

If you're planning to install the original sash, remove the molding pieces that hold the old pane in place. Sand the sash until it is flat and ready to receive new caulk. Once the sash is installed then, apply a new silicone caulk to the glass to ensure that it won't leak or discolor over time.

Take the glazing points out of the rabbets, or the grooves in the sash where the glass sits. If they're difficult to chisel, use a hand tool such as a heatgun over them to soften first. When using a heating tool, make sure to avoid damaging the sash and its railings.

Create a bed for your new pane after removing the old glaze and putty. Roll a piece of glazing compound between your hands, shaping it into a 1/2-inch thick. Press it into the rabbets where the glass will be put. The glass must be positioned against the putty on both sides. If you need to gently tap your glass into the rabbet with your thumb.

If the new pane is cracked, you can use a silicone caulk or glass glue that is based on solvents to fill in the crack prior to pressing it in the sash. If the crack isn't sealed, you will need to apply putty to keep water out. After the putty has dried, clean the oily film off the glass with an abrasive and allow it to dry completely before painting. Paint after the putty is completely dry. It won't make a strong seal and could leak or discolor with time.

Paint

If you've had a broken window pane, you might be worried about the cost of replacing it. It's true that replacing a single piece of glass doesn't need to be expensive if you do it on your own. In fact even windows with replacement double glazed window panes can be replaced at a fraction of the cost of an expert.

First, if you're working on a large window, make sure that it is securely fastened to the frame. Using the proper tools and techniques you can accomplish this task fairly easily and speedy.

When you are ready to start, remove the old window pane. Take out the glazing points made of metal that are attached to it. These are tiny triangles of metal which act as "nails" that hold the window in place. They are submerged under a bead of glazing putty that hardens into a solid, molded wedge which holds the window in place and hides the points.

After you have the old pane taken away, clean up the surrounding frame and wood. Scrape off any paint that has been used and sand down the rabbet grooves where the glazing points were. Sand them down to bare wooden surfaces, allowing you to paint the frames the same color. After sanding, apply a coat of flax oil to the bare wood to extend the life of the frame.

Next, measure the dimensions of the window opening. You will need to take vertical and horizontal measurements of the entire opening, as well as the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure you have the exact size for the new pane. This will also allow for expansion and contraction of the glass during seasonal changes. Bring these measurements to the hardware or home improvement store and ask them to cut you cut the glass 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.