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How to Replace Window Panes

A damaged or cracked window is an inconvenience. This can be an opportunity to upgrade to energy-efficient windows or insulated ones, and reap benefits like increased comfort, increased resale value and reduced utility costs.

This is a project you could tackle yourself at a fraction of the cost of hiring an expert. It requires the right equipment and an hour or two of your time.

Glass

Replace your old single-paned windows with tempered or insulation glass to improve the efficiency of your energy, reduce noise, and protect the historical integrity of your older home. Most homeowners with basic hand tools can replace windows with ease. In addition to a new pane, the following tools are needed such as latex glazing putty; Glazier's points; pliers and the use of a heat gun to warm the old putty if required. Wear safety glasses and gloves before you begin. Working with broken glass could cause serious injuries.

Begin by removing any broken pieces of glass. This is best accomplished with a pair of pliers, but a flathead screwdriver can also be used in the pinch. Make use of a wood chisel or putty knife to get rid of any old putty that remains around the frame and the window sash. Be careful to not scratch the window sash. Work slowly and carefully. It is recommended to work using a sturdy ladder rather than the ground, and to have someone standing below the sash to help keep it in place.

After you've removed all the old putty, it is time to prepare the window frame for the new pane. To allow replacement handles for upvc windows windowreplacement seasonal expansion or contraction and contraction, subtract 1/8 inch from the measurements of the width and height. Take these measurements to the nearest hardware store or home center, and have a piece of stock glass cut to size. Alternatively, you can cut the glass yourself, if you have the right tools.

After installing the new glass Apply some caulking to the edge. This will make the glass weatherproof. Install a glazier's pointing on both sides of the frame. This will help secure the pane. The points shouldn't be so tight that they cause friction between the frame and sash however they shouldn't be too loose.

Before applying the putty to the surface, gently knead it until it becomes soft and free from lumps. Then you can roll it into pencil-sized strips. The first strip should be glued to the corner of the frame. Work from corner to corner to ensure it's even and smooth.

Glazier's Points

The glazier's points are tiny triangular pieces of steel which help to secure glass into a window frame without scratching or damaging the fragile surface. Understanding how to use these little helpers is easy and could save you money on professional installation or the cost of buying new glass.

After the old putty as well as the glazier's point are gone Clean the frame thoroughly using a utility knife to remove any remaining residue. Lightly sand the frame in the rabbet grooves to smooth out rough areas. If you decide to sand the wood, be sure to protect it with painter's tape to avoid accidental damage.

Measure the empty frame's dimensions and write down accurate measurements. Take these dimensions to a hardware store or home center and request that the new pane cut slightly smaller than the frame's opening. This will ensure that the pane fits perfectly and allows for expansion and contraction.

Place the new pane into the frame and press it down with your hands. Utilize the point of the chisel, or the back of the putty knife to tap in the glaziers' points as shown in Figure 11. After you're done, the points should be flush with the top edge of the pane, and the raised shoulders of the points should be below the rabbet's lip. groove.

Apply a thin layer of glazing compound on the rabbet grooves as well as the edges of new glass. This will seal and protect the edges. Let it dry and cure completely.

When the glazing compound is dry, 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 prevent the new putty from soaking up the moisture and deteriorating and cracking with time. Apply this coat using a brush or the tip of your putty knife, then employ the chisel or back end from the putty knife to gently hammer the new sash and glazier's points into the grooves of the rabbet. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball hit, a rock thrown in error, or a fallen tree could result in a broken or cracked window pane. Fortunately, the majority of windows can be easily replaced by simply putting a new piece in the proper place. The glass is held in place with a small metal clip called the glazier's pointed and putty, often called glazing compound. Before installing a replacement double glazing windows pane, first take out the old one and clean the area using an abrasive and a pull-type paint scraper or a wood chisel. Wear safety glasses and gloves while doing this work. If the window is attached to the frame, you'll need to employ a heat gun in order to soften the adhesive before taking it off.

If you're planning to replace your original sash, remove the molding that holds the old pane. Sand the sash until it's flat and ready to receive new caulk. Once the sash is reinstalled then, you can apply a silicone caulk over the glass. This will ensure that it won't get soiled or discolor over time.

Remove the glazing points in the rabbets. These are the grooves on the sash, which is where the glass is located. If they're hard to chisel, use the hand tool, such as a heating gun over them to soften first. If you're using a heating gun, make sure not to cause damage to the railings or sash by placing the tool too close.

Create a bed for your new pane after removing the old glaze and putty. Roll a rope of glazing compound between your hands, forming it to be about 1/2-inch thick. Then, press it into the rabbets, where the glass will be. The glass must rest against the putty on both sides. If necessary, lightly tap your glass into the rabbet with your thumb.

If the new pane is cracked you can fill it with a solvent-based glass glue or silicone caulk prior pressing it into the sash. If the crack is not sealed, you will need to use putty to keep water out. Once the putty is dry clean the oily film off of the glass and allow it to dry completely before painting. If you paint before the putty has completely dry, it will not form a solid seal and could discolor or leak in time.

Paint

You might be worried about replacing a damaged piece of glass. But the truth is that replacing a single glass pane doesn't require a huge amount of money if you do it yourself. In fact, even a double-pane window can be replaced at less than the cost of a professional.

If you are working with large glass windows, first make sure it is securely attached to the frame. This can be done relatively easy and quick with the proper tools and techniques.

When you are ready to begin taking down the old window pane. Remove the glazing points made of metal that are attached to it. These are tiny triangles of metal that act as "nails", holding the window in the frame. They are buried beneath a bead or glazing glue which hardens into an unbreakable wedge that holds the wood frame firmly in position and hides the points.

After you have removed the old pane removed Clean up the frame and wood. Scrape off any old paint, and sand the rabbet grooves in which the glazing points were. These should be sanded to bare wood so that you can paint them the same shade as the rest of the frame. After sanding the wood, apply a layer of flax oil. This will help prolong the life of the frame.

The next step is to measure the dimensions of the window's opening. You'll need to take vertical and horizontal measurements of the entire opening and also the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure that you get the exact measurement for the new pane. This will allow for seasonal changes in the glass. Bring these measurements to a hardware or home improvement store and have 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.