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How to Replace Window Panes

A damaged window pane can be an inconvenience. It could also be an opportunity to upgrade your glass to energy efficient or insulated windows to benefit from more comfort, higher the value of resales and lower utility bills.

You can do it yourself for a a fraction of what it would cost to hire 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 insulated glass to increase energy efficiency, reduce noise, and protect the historical integrity of your older home. The process of replacing windows is easy and can be accomplished by homeowners with basic hand tools. Alongside a Replacement Double Glazing Windows pane, the following items are needed such as latex glazing putty; glazier's points; pliers; and the use of a heat gun to warm the old putty, if needed. Before starting, put on gloves and safety glasses as working with broken glass may cause injuries.

Begin by removing any broken pieces of glass. This is best accomplished with a pair of pliers, however, a flathead screwdriver can also work in a pinch. Then, use a wooden chisel or putty knife remove the remaining old putty around the frame and the sash. Be careful and slow making sure not to break the existing window sash. It is recommended to work on a sturdy ladder rather than on the ground and to have someone stand below the sash in order to help hold it in place.

Once you have removed all the old putty, you can prepare the window frame for the new pane. Take measurements of 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 taken to a hardware or home center store to get a piece cut of stock glass to the right size. You can also cut the glass by yourself if you have the right tools.

After putting in the new pane, run a small bead of caulking around the edge 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 that they create friction between the frame and the sash however they should not be loose.

Before applying the putty to the surface, you must knead it thoroughly until it becomes soft and free of lumps. Then, roll it into pencil-size strips. The first strip should be placed to the corner of the frame, moving from one corner to the next so that it is even and smooth.

Glazier's Points

The glazier’s points are small triangular pieces of metal which help to secure the glass to the frame without damaging the delicate surface. Knowing how to use these hidden tiny helpers is simple and can save you money on a professional installation or the cost of buying new glass.

After the old putty and glazier's points are removed and the frame is thoroughly cleaned with a knife to eliminate any remaining residue. If necessary, lightly sand the wood in the grooves of the rabbet to smooth out rough areas. If you decide to sand the wood, make sure to protect it with painter's tape to avoid accidental damage.

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

Place the new pane in the frame and push it in with your hands. Then, use the tip of your chisel or back end of the putty knife to tap in the glazier's facets, as illustrated in Figure 11. The glazier's points should sit flush against the top edge of your pane, and the shoulders should be just below the lip.

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

Install the new window sash when the glazing compound has dried. First, coat the wood with an even layer of linseed. This will prevent the new putty from sucking up the moisture and deteriorating and cracking over time. Apply this coat with a brush or the edge of your putty knife, and then employ the chisel or back end of the putty knife to gently press the new sash and glazier's tips into the grooves of the rabbet. Repeat this process every 10 inches around the perimeter of the frame.

Putty

A baseball thrown or a rock thrown in error, or a fallen tree could result in a broken or cracked window pane. Fortunately, windows can be replaced by simply putting a new piece in the right place. The glass is held in position by a small metal clip, referred to as the glazier's point, and putty. This compound is also referred to as glazing compound. Remove the old pane and clean the area with the rag, a pull-type scraper, or a wood chisel. Wear gloves and safety glasses while working. If the window is secured to the frame, you'll need to use a heat gun to soften the adhesive before cutting it loose.

If you are planning to replace the original sash, take off the molding that supports the old pane. Then, sand the sash to ensure it's smooth and ready for a new caulk. Once the sash is put back in place it is possible to apply a silicone caulk over the glass. This will ensure that it won't get soiled or discolor over time.

Remove the glazing points from the rabbets and the grooves in the sash that the glass is. If they're hard to cut, place an instrument such as a heating gun over them to allow them to soften before. If you're using a heating gun, be cautious not to scratch the sash or its railings by placing the tool too tightly.

Create a bed for your new pane after you have removed the old glaze points and putty. Roll a piece of glazing compound between your hands, forming it into a 1/2-inch thick. Press it into the rabbets where the glass will be placed. The glass must rest against the putty on both sides. If you need to you want to tap your glass lightly into the rabbet with your thumb.

If the new pane has a crack you can fill it with a solvent-based glass glue or silicone caulk prior to pressing it into the sash. If the crack isn't sealed, you'll require putty to keep the water out. After the putty has dried clean the oily film from the glass and let it dry completely before painting. If you paint before the putty has completely dry, it won't create a strong seal and may leak or discolor in time.

Paint

You might be worried about replacing a damaged piece of glass. However, replacing a single glass pane doesn't have to break the bank if you do it yourself. Even a replacement double glazed windows-paned window could be replaced for a fraction of the price it will cost a professional.

If you're working with large glass windows, first make sure it is securely attached to the frame. This is relatively easy and fast with the right tools and techniques.

If you're ready to begin, begin by removing the old upvc window handle replacement pane by prying out the glazing points of metal that are connected to it. These are basically small metal triangles that act as "nails" which hold the window in in the wood frame. They are buried beneath a bead or glazing glue that sets to form a solid wedge that holds the wood frame securely in place and hides the sharp edges.

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

Next, measure the width of the window's opening. It is necessary to measure the vertical and horizontal dimensions of the entire opening as well as the thickness. To determine the exact dimensions of the new pane subtract 1/8 inch from both measurements. This will also allow for expansion and contraction of the glass during seasons of change. Take these measurements to the hardware or home improvement store, and they will 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.