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How to Replace Glass Windows

If a window pane is cracked the gaps that form allow moisture to enter the home. These holes also lower energy efficiency and resale value.

A replacement is a cost to replace window-effective and simple option. You'll require metal glazing points, pliers, latex glazing putty and the heat gun. Wear safety glasses and gloves.

Measure the Window

Getting the measurements right can be the difference between success and failure in a window replacement project. If you order a replacement window that is the wrong size, it could be expensive to install and could not fit properly into the opening. To avoid this you must follow these steps to take measurements of the old window prior to taking it down.

Start by measuring the width of the window frame in three places - the top, middle and the bottom. Use a tape measure and note every measurement. Be aware that the width of the window does not include any trimming. Then, measure the height of the frame in three places The left side, the middle and the right side. Select the shortest measurement and note it. Subtract 1/4 inch from both these measurements to get a rough estimate of the width and height.

When measuring the height, be sure to include any jamb trimming. The distance should be measured between the inside of the jambs on the left and right side to the head jamb. If the window is made of drywall, measure up to the top of it.

Once you have the measurements, you can remove the nails and putty that are holding the old pane. If the molding on the one side of the frame is soiled you can employ an old chisel, or a scraper for paint that has a pull-type. If there are only small pieces of molding, simply pry them loose with a utility knife. Then you can take measurements for the new window frame.

Remove the Old Pane

An errant baseball, a branch that is not flying or a careless cleaning session can crack even the most sturdy of window panes. In the majority of cases, the glass is held in place by glazier's putty as well as small metal clips referred to as glazier's points. To replace glass on window a broken glass pane, the first step is to eliminate any old points and glaze putty. Then the replacement can be placed in its place and coated.

To avoid damaging the new pane, wear protective gloves and work on a flat surface. Use a utility blade to remove the putty from the rabbet. If the old putty is hard to remove, soften it using a hair dryer before using your knife. You can also use a heating gun for difficult to remove glazing putty however, be sure to apply the heat in short bursts and don't touch the glass with any tools that were used on the frame.

After the old putty is gone after which you can number the nail fasteners or points and mark where they were seated in frame. Using a pair of pliers, remove the old nails or brads. If the frame is painted, you will need to chip off the paint with a knife to remove the point.

Find the width and depth of the frame opening, if you are planning to buy a new glass. Subtract 1/8 inch on all sides to ensure that the replacement glass fits. Many hardware stores and home improvement centers carry the correct size. You could also have the glass cut to your exact size by a majority of glazing and glass companies. If you decide to do this, you must make sure that the glass is a quarter inch smaller than the opening of the frame.

Set the New Pane

When replacing a window pane it is best to use energy efficient glass. You will save money on heating bills and cooling costs, as well as helping to save the environment. You can also opt for an elegant or historical glass style to improve the aesthetic of your home.

Before you begin, clean the glass you are using to make sure there are no streaks or smudges. Make use of a utility knife to scrape off the old glass putty, and then clean away any leftover. It is best to work in an area that is well ventilated. Also, keep mineral spirits, or another solvent on hand to clean up any mess.

To install the new window pane start by applying a thin bed of compound to the backstop. Place the pane into the rabbets, then press it to hold it in place. Work until the window is completely centered in the opening, and only 1/8 inch space remains between the glass's face of the glass and the rabbet.

While you're there, scrape and sand the surrounding wooden rabbets and then paint them with an exterior primer. This will help prevent water from getting into the new pane. After the primer has dried, knead it until it is soft and malleable. Then, push it into the rabbets. It's OK to be a little rough here, as the aim is to create an elongated seal that lasts.

Apply the Putty

In the past, prior to double glazing or upvc windows, the majority of windows were constructed out of steel (usually zinc-coated) or wood and one glass pane was dropped into them. Small nails or spriggs, as they were called were then placed into the frame to keep the glass in the right place. If you take a close look at the nails, it should be easy to remove them. If they don't move, you may need to spray them with silicone sealant remover and/or dissolver, as this will dissolve the glue that holds them, allowing you to free them.

Alternately, you can employ a heat gun to melt the old glazing putty and make it easier to chip away with a chipper. This is a safer option, but you must still be careful not to focus the heat on one area of the wood surface and cause cracks to form. Always wear leather gloves and eye protection when using a heat gun and ensure the window is securely secured to stop it from moving when you cut the old putty.

It is important that you clean the frame with the rag dipped in mineral turpentine before applying any new putty. This will remove any dried putty and give the frame more grip. Next apply a thin bead of white putty to the inside of the groove where the glass will be. It is vital to get it right or Replace Glass Windows the window won't fit in the groove correctly. The glazing points can be replaced if required after the putty is smoothed and shaped using a rag that has been soaked in Turpentine.

Apply the oil

If it's a casement windows (which hangs from the top and opens as doors) or a double- or single-hung window double glazing replacement, you'll need remove the sash or the sliding part of the window that holds the glass. Take off the top of the sash by pressing on the vinyl jambs that line the frame's sides. Then you can give it a slight twist to free the latch springs on the bottom. Slider windows are the simplest, as you can usually simply lift the bottom of the sash and remove it from the frame.

After the old glass has been removed then use a wirebrush and an utility knife to clean the frame. This will get rid of any dirt or paint that may have been stuck in the grooves of the glazing beadwork. You can also soften the glazing putty with a heat gun, but take care not to scorch the wood. If needed, sand the grooves until you have bare wood.

Get your new window glass at a full-service hardware shop once the sash has been removed. Make sure you take the measurements accurately and subtract 1/8 of an inch to account for shrinkage. Find a package that has glazing points to keep your glass in place until the putty is hardened.

Apply a thick coat of linseed onto the wood frame before re-glazing the window. Let it soak into. This lubricates the wood, which will help your new glue last for a longer time than it would have without it. You can then move on to the rest of your project. The same oils from linseed can be used to lubricate tracks and hinges of sliding doors. This will keep windows and doors running smoothly and stop them from binding or sticking.