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How to Replace Window Panes

A damaged or cracked window can be a source of frustration. It could be a chance to upgrade your windows to energy efficient or insulated ones, and reap benefits like increased comfort, increased resale value and lower utility costs.

It's a task you can 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 Window pane your single-paned windows with tempered or insulation glass to improve energy efficiency, cut down on noise, and maintain the historical integrity of your older home. Most homeowners with basic hand tools can repair windows with ease. Alongside a replacement pane, the following tools are required: latex glazing putty; glazier's points; pliers; and the use of a heat gun to warm the old putty, if needed. Before starting, wear protective gloves and goggles since working with broken glass can cause injuries.

Begin by removing any remaining broken pieces of glass. It is recommended to use pliers for this however a flathead could work as well. Then, use a wood chisel or putty knife take the remainder of the old putty from the frame and sash. Be careful not to damage the window sash. Take your time and work slowly. This is best done on a ladder, not the ground. Also, have someone lower to hold it steady.

After you've removed all the old putty, you can prepare the window frame for 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 an hardware or home centers store to get an item cut from glass stock to the proper size. Alternately, you can cut the glass yourself if you have the appropriate tools.

After installing the new pane, run a small bead of caulking around the edges to make it weatherproof. Install a glazier's pointing on both sides of the frame. This will secure the pane. The points should not be tight enough to cause friction between the frame and sash, but they should also not be loose.

Before applying the putty make sure to knead it until it is smooth and free of lumps. Then, roll it into pencil-size strips. Apply the first strip in the corner of the frame, moving from one corner to the other to ensure it is even and smooth.

Glazier's Points

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

After the old putty as well as the glazier's point are gone, thoroughly clean the frame using a utility knife to get rid of any remaining residue. Lightly sand the wood into the rabbet grooves to smooth rough areas. If you decide to sand wood, protect it with painter's tape to protect it from damage caused by accidental sanding.

Write down the dimensions of the frame. These measurements can be taken to the hardware or home center store, and the new frame will be cut slightly smaller. This will ensure a snug fit, and allow for expansion and contraction.

Place the new window in the frame and push it into the frame with your hand. Then, use the tip of your chisel, or the back of the putty knife to make a tap on the glazier's facets, as illustrated in Figure 11. The glazier's point should be in line with the top edge of the pane and the raised shoulders should be just below that lip.

Apply a thin layer glazing compound to the rabbet grooves and the edges of the glass. This will seal and protect the edges. Allow it to dry and cure completely.

After the glazing compound dries and the glazing compound is dry, you can install the new window sash. First, coat the wood with a heavy coat of linseed oil. This will prevent the newly-created putty from drying out or cracking due to the moisture it absorbs. Apply the coating using a brush this coat, or the tip of the blade. Then, use the chisel that is on the back of the putty tool or the back of the putty handle to gently hit the new sash, or glazier's point into rabbet grooves. Repeat this process every 10 inches around the frame's perimeter.

Putty

A baseball thrown, a rock thrown in error or Replace window pane a branch falling could result in a broken or cracked window pane. Luckily, most windows can be repaired by simply putting a new piece in the proper place. The glass is held into place by a small metal clip, referred to as a glazier's point and putty. This compound is also called glazing compound. Before installing a replacement upvc window handles pane, first take out the old one and clean up the area using the help of a rag, a pull-type paint scraper or the 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 into the frame.

If you're planning to replace your original sash, remove the mold that holds the old pane. Sand the sash until it's flat and ready to receive new caulk. After the sash has been re-installed and sanded, apply a fresh silicone caulk around the glass to ensure that it doesn't swell or fade as time passes.

Remove the glazing points from the rabbets. These are the grooves on the sash, which is where the glass is located. If they're difficult to cut out, you can try holding an instrument like a heat gun to soften them first. If you're using a heated gun, be careful not to cause damage to the railings or sash by holding the tool too close.

Make the bed for your new pane after you have removed the old putty and glazing points. Roll a rope made of glazing compound between your fingers, and then make it about 1/2 inch thick. Press it into the rabbets, where the glass will be put. The glass must rest against the putty on both sides. If you need to gently tap your glass into the rabbet using your thumb.

If the new pane is cracked you can fill it with a solvent-based glass glue or silicone caulk before pressing it into the sash. If the crack isn't sealed, you will need to use putty to keep water out. When the putty dries then clean the oily film off the glass using the help of a rag. 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 in time.

Paint

If you've had a broken window pane, you may be worried about the cost of replacing it. However, replacing one glass pane does not have to break the bank if you do it yourself. In fact even windows with double panes can be replaced for only a fraction of the cost of an expert.

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

When you're ready to start taking off the old window by removing the metal glazing points that are connected to it. These are essentially small metal triangles that act as "nails" that keep the window in in the wood frame. They are buried beneath a layer of glazing putty that is then cured to form a solid, molded wedge that holds the window firmly in place and conceals the edges.

After removing the old pane, clean the frame and wood. Scrape off any old paint, and sand the rabbet grooves in which the glazing points were placed. Sand them to bare wood surfaces, so that you can paint the frames the same shade. After sanding the wood you can apply a layer flax oil. This will help to prolong the life of the frame.

Then, take measurements of the dimensions of the window opening. It is necessary to measure the horizontal and vertical dimensions of the entire opening as well as the thickness. 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 the hardware or home improvement store, and they will 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.