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How to Replace Window Panes

A cracked window pane can cause a lot of trouble. It can also be an opportunity to upgrade your glass to energy-efficient or insulated windows, and enjoy benefits such as greater comfort, a higher the value of resales and lower utility bills.

You can do it yourself for less than what it would cost to employ an expert. You'll need only the appropriate tools and a few hours of your time.

Glass

If your single pane windows are old broken, deteriorating or damaged, replacing them with newer insulated or tempered glass can increase energy efficiency and decrease noise while preserving the original character of older homes. The replacement of the window pane is easy and can be completed by anyone with basic hand tools. You will also need an additional window pane, glazier's suggestions, pliers, and latex glazing putty. If you need to, you can use a heatgun to warm the old putty. Wear safety goggles and gloves before you begin. Working with broken glass can cause serious injuries.

Begin by removing any remaining broken pieces of glass. This can be done with pliers, though using a flathead screwdriver can also work in a pinch. Utilize a wood chisel or putty knives to remove any old putty that remains around the frame and the window seal replacement sash windows (Gwwa Yodev says) sash. Be careful to not scratch the window sash. Be careful and slow. It is recommended to do this on a stable ladder rather than on the ground, and to have someone standing below the sash to help hold it steady.

Prepare the window frame to accept the new pane when you have removed the old putty. To allow for seasonal expansion or contraction, subtract 1/8 inch each from the measurements of the width and height. Bring these measurements to the nearest hardware store or home center and find a piece glass cut to size. Alternately, you can cut the glass yourself if have the right tools.

After putting in the new glass Apply caulking around the edge. This will make the glass weatherproof. Install a glazier's point on both sides of the frame. This will help secure the pane. The points should not be too tight that they cause 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 is soft and free from lumps. Then make it into pencil-sized strips. The first strip should be placed in the corner of the frame, working 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 steel that help secure the glass into the window frame without causing damage to the delicate surface. It's easy to understand how to use this hidden tool, and you'll save money on the cost of an expert installation.

After the old putty as well as the glazier's points have been removed Clean the frame thoroughly using a utility knife to eliminate any remaining residue. If needed you can lightly sand the wood in the grooves of the rabbet to smooth rough spots. If you sand wood, protect it with painter's tape to protect it from damage caused by accidental sanding.

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

Insert the new pane into the frame and push firmly with your hands. Then, you can use the point of your chisel or the back end of the putty knife to make a tap on the glazier's points, as shown in Figure 11. When you're done taping, they should be in line with the top edge of the pane and the raised shoulders of the points should be just below the lip of the rabbet groove.

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

Install the new window sash once the glazing compound has dried. First, coat the wood with a thick layer of linseed. This will keep the new putty from taking up the moisture and drying out and cracking with time. Apply the coat using a brush or the edge of your putty knife, then use the chisel or the back end from the putty knife to gently hammer the new sash and glazier's tips into the rabbet grooves. Repeat this process in intervals of 10 inches around the frame.

Putty

A baseball thrown or a rock thrown in error or a branch falling could result in a broken or cracked window. Luckily, most windows can be easily replaced by simply putting a brand new piece in the right place. The glass is held into the position with a tiny metal clip, referred to as the glazier's point, and putty. This compound is also known as glazing compound. Remove the old pane and clean the area using a rag, a pull-type scraper or wood chisel. Wear protective glasses and gloves when working. If the window is attached to the frame, you'll have to make use of a heat gun to soften the adhesive prior to cutting it loose.

If you're planning to install the original sash, remove any molding pieces that secure the old pane. Then you can sand the sash down to ensure it's level and ready for new caulk. Once the sash is put back in place, you can apply a silicone caulk on the glass. This will ensure that it won't get soiled or discolor over time.

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

After the old points of glazing and putty have been removed prepare a bed for the new pane. Roll a rope of glazing compound between your hands, forming it to be about 1/2-inch thick. Press it into the rabbets where the glass will be placed. The glass should rest against the putty on both sides. If necessary gently tap your glass into the rabbet with your thumb.

If the new pane has damaged, you can use a silicone caulk or glass glue made from solvents to seal the crack before pressing it into the sash. In other cases, you'll need to apply putty over the crack to create an airtight seal and keep water out. After the putty has dried, wipe the oily film from the glass and let it dry completely before painting. Paint before the putty has completely dried. It won't create a solid seal and could be leaking or discoloring over time.

Paint

You may be concerned about replacing a damaged piece of glass. The truth is, replacing a single piece of glass doesn't need to be costly when you do it on your own. In fact, even a double-pane window can be replaced for only a fraction of the cost of an expert.

If you are working with large glass windows first, ensure that it is securely attached to the frame. Using the proper tools and techniques, you can complete this task easily and speedy.

When you are ready to begin with the removal of the window pane. Pry out the glazing points made of metal that are attached to it. They are basically tiny metal triangles which function as "nails" which hold the window in in the wood frame. They are placed under a bead or glazing putty that sets to form a solid wedge which holds the wood frame in place and hides the sharp edges.

Once you have the old pane taken away clean the surrounding frame and wood. Scrape off any paint and window seal replacement sand down 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 you can apply a layer flax oil. This will help extend its life.

Then, take measurements of the dimensions of the window opening. You'll need to take horizontal and vertical measurements of the entire opening and also the thickness of the old pane. 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 in times of seasonal change. Bring these measurements to a hardware or home improvement store, and they will 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, it can be painted with the same color as the frame to prevent water and air from leaking into the frame and causing fogging.