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How to replace Window Pane Window Panes

A cracked window pane is an inconvenience. It can also be an opportunity to upgrade your glass to energy efficient or insulated windows, and benefit from greater comfort, a higher potential for resales, and less costs.

You can do it yourself for a fraction of 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 old single-paned windows with tempered insulation glass to improve energy efficiency, reduce noise, and maintain the original character of your older home. The procedure of replacing a window pane is relatively easy and can be completed by most homeowners who possess basic hand tools. In addition to a new pane, the following items are needed such as latex glazing putty; glazier's points; pliers; and a heat gun for warming the old putty if required. Wear safety glasses and gloves prior to beginning. Working with broken glass could result in serious injuries.

Begin by removing any remaining broken pieces of glass. This can be done with pliers, but flathead screwdrivers can be effective in a pinch. Use a wood chisel, or putty knives to remove any remaining old putty around the frame and window sash. Be careful to not damage the window sash. Take your time and work slowly. This is best done on a ladder, not on the ground. Also, you should have someone below the sash hold it steady.

Once you have removed all the old putty, it is time to prepare the window frame to accommodate the new pane. Measure the width and height of the opening in the sash by subtracting 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be sent to a hardware or home center store to get a piece cut of glass stock to the proper size. You can also cut the glass yourself if you have the tools you need.

After installing the new glass Apply some caulking around the edge. This will make the glass weatherproof. Then install a glazier's point on the frame's opposite side to secure the pane into its place. The points should not be so tight as to cause friction between the sash and the frame however they should not be too loose.

Before applying the putty to the surface, knead thoroughly until it is soft and free from lumps. Then you can roll it into pencil-sized strips. Place 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 points are small triangular pieces of steel which help to secure the glass into the window frame without causing any damage to the fragile surface. Learning how to use these tiny helpers is simple and can save you money on a professional installation or the cost of buying new glass.

After taking off the old putty, glazier points as well as any remaining remnants Clean the frame thoroughly using an utility knife. Lightly sand the frame in the rabbet grooves to smooth rough areas. If you do sand your wood, make sure to protect it with painter's tack to avoid accidental damage.

Take the dimensions of the frame and note down precise measurements. Take these dimensions to an 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 snugly and allows for expansion and contraction.

Insert the new pane into the frame and push firmly with your hands. Then, use the tip of your chisel, or the back of the putty knife to pierce the glazier's facets, as shown in Figure 11. After you're done, the points should be in line with the top edge of the pane. the raised shoulders of the points should be just below the rabbet's rim groove.

Apply a small amount of glazing compound over the edges of the new glass and into the rabbet grooves, to seal and protect them. Let it dry completely and cure.

Once the glazing compound has dried, you're ready to install the new window sash. The first step is to coat the wood with a thick coat of Linseed oil. This will keep the new putty from sucking in the moisture and drying out and cracking over time. 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 putty handle to gently smash the new sash or glazier's point into the grooves of the rabbet. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball thrown at you or an unintentional rock, or falling branch could cause a window pane to crack or break. Fortunately, the majority of windows can be repaired by simply putting a brand new piece of glass in its the right place. The glass is held in the position with a tiny metal clip, referred to as the glazier's point, and putty. This compound is also referred to as glazing compound. Before installing a replacement upvc window handles pane, first get rid of the old one and clean up the area using a rag and an abrasive scraper that is a pull type or an abrasive wood chisel. Wear gloves and safety glasses when working. You'll need a heating gun in the event that the window is glued to the frame.

If you are planning to replace the original sash, gently remove any pieces of molding that are used to secure the old pane. Sand the sash until it is flat and ready to receive new caulk. Once the sash is installed then, you can apply a silicone caulk on the glass. This will ensure that it doesn't leak over time or discolor.

Remove the glazing points from the rabbets, or the grooves in the sash, where the glass sits. If they're hard to chisel out, try placing an instrument like a heat gun over them to soften them before you do. When using a heated tool, be sure to not damage the sash or its railings.

Once the old glaze points and putty are removed, prepare a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it around 1/2 inch thick. Then, push it into the rabbets where the glass will be. The glass should rest against the putty on both sides. If necessary, lightly tap your glass into the rabbet using your thumb.

If the new pane has a crack you can fill it with a solvent-based glass glue or silicone caulk before pressing it into the sash. If not, you'll have to apply putty over the crack to form a tight seal and keep water out. After the putty has dried and the film is oily, wipe it off the glass using an abrasive and replace window pane allow it to dry completely before painting. If you paint before the putty is completely dry, it won't create a strong seal and may be leaking or discoloring over time.

Paint

You might be worried about replacing a damaged piece of glass. In reality, replacing a single pane glass doesn't have to be expensive when you do it on your own. In fact even windows with double panes can be replaced at less than the cost of an expert.

If you're working with large glass windows first, ensure that it is securely attached to the frame. This task is relatively easy and quick with the appropriate tools and techniques.

When you are ready to start taking down the old window pane. Take out the metal glazing points attached to it. They are basically tiny metal triangles that act as "nails" which hold the window in place within the frame of wood. They are buried under a bead of glazing putty, which is then cured to form a solid, formed wedge which holds the window in place and hides the edges.

After removal of the old pane clean the frame and wood. Scrape away any old paint and sand down the rabbet grooves, where 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 sanding, apply a layer of flax oil to the wood that is not sanded down to prolong its life.

Then, take measurements of the dimensions of the window's opening. You will need to take horizontal and vertical 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 seasons of changes. Take these measurements to a hardware or home improvement store and have 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, replace window pane it can be painted with the same color as the frame to prevent water and air from leaking into the frame and causing fogging.