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What Is Replacement Sealed Double Glazing Units And How To Utilize It?
Replacing Double Glazed Units

Replacing double-glazed units is a home improvement task that can drastically reduce heat loss, enhance the insulation of noise and reduce heating bills. Modern coatings and argon/krypton filled units make them very energy efficient.

The new unit, crafted to exact measurements, is waiting for its time and requires attention and precision. This is the moment that stops time and puts everything in perspective.

Removing the Old Unit

It is essential to take out the old unit in order to ensure that your new double-glazed window is made to precise measurements. Make sure to clean the frame of any dust, dirt or old sealant, and then repair any damage that could be present. Sanding and wood filler can be used to repair minor damages, but major damage may require professional repair.

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

The best place to begin is to remove the bottom bead from the glazing strip using a sharp chisel or sharp wide-bladed screwdriver. Once the bead has been removed, it is advisable to ask for help from a person who can hold the sealed unit as you remove the remaining beads. This is because the unit could easily fall out of the frame and hit.

After all the beads have been removed, it is essential to carefully measure the dimensions of the width, height and thickness of the unit that is currently in use. The measurement data can then be used to construct the replacement unit you want for your home. It can also be used as a guideline to ensure that the new unit is constructed to fit the frame. It is essential to ensure that the window fits correctly because a mismatch will not only require the whole unit to be dismantled and reassembled but will also impact its performance. This is particularly relevant in Australia as our homes are often subject to extreme weather conditions.

Preparing the Frame

Whether you are replacing a fixed window, or a sliding door that has an opening or fixed sash, make sure the new unit is the correct size. UPVC frames have very little movement and a double-glazed sealed unit that is just a few millimeters larger than the original is not going to fit. Be sure to measure carefully and consult a professional or the manufacturer's guide if necessary to ensure accurate measurements.

Remove the glass from the frame once you're certain 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 strips or beads that secure the glass in the frame, from around the perimeter of the pane. You should avoid slipping the glass or straining the frame.

Make sure the frame can be opened and closed smoothly after the double-glazing unit that is sealed is installed. You can alter the fit if needed by removing or adding packing. For instance, if the frame is a sliding door, you may need to add additional packers at the top of the hinge's side and in the opposite corners to stop the sash from catching or rattle when it opens.

Then, clean the frame. Remove any old glazing tape or sealant If needed. Assess any damage, and make small repairs, if needed, using wood filler or sanding. The frame will be refreshed by a final cleaning and inspection, allowing it to withstand Australia's harsh weather for years.

Lifting the New Unit


Over time double glazed sealed units (or a 'sealed unit' as it is more commonly known) can develop issues like moisture between panes or misting. If this happens, the effectiveness of your window is diminished, letting cold air in and allowing warm air from your heating system to escape which can result in the cost of energy and loss of comfort.

This kind of failure in seals typically occurs due to aging general wear and tear, or harsh chemical cleaners deteriorating the sealing material. Sometimes, the cause is due to the shrinking and expansion of the glass during the changing seasons and the temperature fluctuations in the home.

After the frame is cleaned and ready then you can lift the new unit onto the frame. This is an exciting step because you've made a significant improvement to your home, increasing its comfort in winter and cooling in the summer, while helping to reduce your energy bill.

It is essential to ensure the new unit is properly fitted in the frame prior to locking it to the frame. This is essential to avoid damaging the frame and the glass.

If your windows use glazing tape or sealant this is the perfect time to apply a bead around the edges of the glass and frame creating a solid barrier against moisture and air infiltration. Tighten the sealant with care, ensuring it's secure but not too tight to strain the glass or frame. Finally, give the full details on the back for a job well done, and then enjoy your newly-installed double-glazed window!

Securing the Unit

With the new unit seated perfectly in the frame, and a new layer of sealant covering its entire perimeter it is the moment that marks the end of your work. The unit is now secure to withstand Australia's varying weather conditions, which is a guarantee for warmth in winter and cooling in summer. This is the moment to confirm your careful measuring and removal, a confirmation of a unit that was designed according to precise measurements.

It is essential to find the perfect balance between the need to secure the unit and not overstressing the glass. If it is too loose, then the unit may lose its airtight seal. If it's too tight, it might cause damage to the frame or weaken the material. Each screw should be put in its original position, and turned just enough to secure the unit without putting pressure too high.

This is the last step in a transformational plan that improves a home's comfort as well as energy efficiency and appearance. With the new double-glazed unit snugly seated in the frame and secured with an all-new layer of sealant around its perimeter This is the moment that marks your work's completion.

The space between the glass panes is filled with either argon or desiccant. Argon is, unlike air, has a lower thermal conductivity, which can reduce heat transfer. Desiccants also adsorb 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. The aluminium not only prevents heat transfer, but also keeps the edge warm of the insulated window to prevent condensation.

Be sure to check your work

It is important that you leave the silicone sealant to cure after you have installed the new unit. It will take at minimum four hours for the silicone sealant to reach its maximum strength and create an impenetrable barrier. While you wait, evaluate your work to see if there are any gaps or issues that could affect the effectiveness or appearance.

It is also a good moment to inspect the seals and frame for indications of damage that require attention, and to assess whether replacement of the entire window is needed. A faulty seal will affect the efficiency of your home's energy use and can cause drafts or cold spots. It can also permit ultraviolet rays to penetrate the house, causing fading of furniture and reducing the life span of carpets and curtains.

If you're experiencing any of these problems it's a sign that your double-glazed windows need replacement. It can help you save money on your energy bills, and also create a more peaceful and comfortable living space.

Replacing a double glazed sealed unit is a labor-intensive and technical process that requires the appropriate equipment, meticulous preparation and precise measuring. It is not an DIY project and should be done by a professional with prior experience working with uPVC Windows and Doors. They can ensure that the new unit is installed correctly to protect your home from the elements. Their expertise and knowledge will ensure that your double-glazed unit is quiet and efficient combination of warmth in winter and coolness in summer, shielding your home from weather.

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