Notes

What Experts From The Field Want You To Know
Replacing Double Glazed Units

Replacing double glazed units is a project for home improvement that can greatly reduce heat loss, improve noise insulation and lower heating bills. With modern coatings and argon or Krypton gas fills, they can be extremely energy efficient.

The new unit, made to exact measurements, is awaiting its place. It needs care and accuracy. This is the moment that will stop the world and puts your effort into perspective.

Remove the Old Unit

It is crucial to remove the old unit to ensure that the new double-glazed window has been constructed to exact measurements. Clean the frame thoroughly of any dust, dirt or old sealant and repair any damage that might be present. Small repairs can be made with wood filler or sanding, while major damage may require professional repairs.

After the glass has been removed, it's important to determine its width, height and thickness. This can be done by removing the glass beads that hold the unit. This is a delicate process that requires patience and care. Take your time and wear safety gear to avoid shards and slips.


The best place to start is by removing the bottom bead of the glazing strip, with a chisel that is sharp or a sharp wide-bladed screwdriver. After the bead is removed, it's recommended to ask for help from someone who can hold the sealed unit while you take out the remaining beads. The unit is prone to fall off the frame and break.

After you have removed all the beads, it is crucial to determine the width, the height and the thickness of the current unit. The measurement data can then be used to accurately construct the replacement unit you want for your home. It can also be used as a guide to ensure that the new unit is sized correctly for the frame. This is important as an inadvertent misfit could cause the need to remove and reassemble the entire window but also affect its efficiency and performance. This is especially important in Australia where homes are frequently exposed to extreme weather conditions.

Preparing the Frame

If you are replacing a fixed sliding door window that has an opening or fixed sash make sure that the new unit is the proper size. UPVC frames offer only a small amount of movement, and a sealed double glazing unit that's a few millimeters too big will simply not fit. Measure carefully and consult a professional or manufacturer's guide in order to make sure you get accurate measurements.

Remove the glass from the frame when you are sure that the replacement is the right size and has been correctly fitted. Wear safety gear, like gloves and work in an area that is well-lit to prevent injury from glass fragments. Utilize a putty knife to remove the glazing stripes or beads that hold the glass in the frame from the perimeter of the pane. The glass is hard, and you should be careful to avoid slipping or stressing the frame.

Make sure the frame can be opened and closed smoothly after the new sealed double-glazing unit is installed. It should be a good fit, but you are able to adjust it if you need to by adding or removing packing. For instance, if the frame is a sliding door you may need to add additional packers on the hinge's side and in the opposite corner to keep the sash from getting caught or shaking when it opens.

Then clean the frame. Remove any old glazing tape or sealant If necessary. Examine any damages and make small repairs with wood filler or sanding, if required. The frame will be rejuvenated by a final cleaning and inspection and will be able to stand up to the harsh Australian weather for many years.

Lifting the New Unit

Over time, double-glazed sealed units (or a sealed unit as it is often called) may develop issues such as moisture in-between panes or misting. This can reduce the efficiency of your windows and allow cold air to pass through and warm air from your heater to escape, leading to high energy bills and discomfort.

This type of seal failure typically occurs due to aging, general wear and tear or harsh chemical cleaners that deteriorate the sealing material. Sometimes, however, the cause could be due to the expanding and shrinking of the glass due to temperature fluctuations and seasonal changes.

When the frame is cleaned and ready, you can begin to move the unit into place. This is a thrilling moment as you've improved the heating of your home in the winter months and cooling in the summer months, while also reducing your energy bill.

It is crucial to ensure that the new unit is properly fitted into the frame before securing it to the frame. A little care during this stage will help prevent any damage to the frame, and also the glass.

If you are using sealing tape or glazing tape on your windows, this is the perfect time to apply a bead along the perimeter of the glass. This will create a strong barrier that will prevent air and moisture from entering the window. Be certain to tighten the sealant in a controlled manner but not so much that it strains the frame or glass. Enjoy your newly installed double-glazed windows and reward yourself a pat on the back for a job well done!

Securing the Unit

With the new unit sitting comfortably in the frame and a fresh bead of sealant covering its entire perimeter it is the moment that signifies the end of your work. The unit is now secure to hold up to Australia's varied weather which guarantees warmth in winter and coolness during summer. It's the moment when you can confirm the accuracy of your measurement and removal, a confirmation of a product that has been designed according to precise measurements.

No matter if a window has glass beads or screws fastening the new unit to the frame requires a delicate balance between tight enough to hold it in place and soft enough not to stress the glass. If it is too loose, the window could be unable to seal its airtight. If it's secure enough, it could damage the frame or warp material. Each screw must be put in its initial position and turned just enough to secure the unit without putting too much pressure on it.

This is the final stage in a transformational plan that improves a home's comfort as well as energy efficiency and appearance. When your work is complete, with the new double-glazed unit safely placed in the frame and a new bead adorning the perimeter.

The glass panes can be filled with either argon or desiccant. Unlike air, argon has significantly lower thermal conductivity and reduces heat transfer through the glass. Desiccants also absorb moisture from the air, which prevents mould and condensation in the frame. The spacer bar that is usually made of aluminium is also an essential component of the insulation system. Aluminium not only impedes heat transfer, but also keeps the edges warm of the window insulated to avoid condensation.

Checking Your Work

It is essential to leave the silicone sealant to set once you have installed the new device. It will take at least four hours for the silicone sealant to reach its maximum strength and create an impenetrable barrier. While you wait, take the opportunity to visually evaluate your work and determine if you can identify any gaps or issues that could compromise the performance or appearance of the unit.

It's also a good opportunity to check the seals and frames to determine if there are any signs of damage, and determine if the entire window needs to be replaced. Window and Door Seals and Gaskets Replacement can have a huge impact on the energy efficiency of your home, leading to drafts and cold spots. It also lets UV rays enter the home which can cause furniture to fade, and curtains and carpets to wear more quickly.

If you are having any of these issues, your double glazing may need to be replaced. If you take care of it promptly, it can lower your energy costs and create a more comfortable and relaxing home.

Replacing a sealed double glazed unit is a labor-intensive and technical process that requires the right equipment, meticulous preparation and precise measurements. It is not an DIY project and should be undertaken by a specialist who has experience with uPVC Windows and Doors. They can ensure that the new unit is installed correctly to protect your home from the elements. Their experience will ensure the double-glazed model you choose is both efficient and quiet offering warmth in the winter months and cooling in summer. This will protect your home against the weather.

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