5 Replacement Sealed Double Glazing Units Lessons Learned From Professionals

· 6 min read
5 Replacement Sealed Double Glazing Units Lessons Learned From Professionals

Replacing Double Glazed Units

Double glazed units can be substituted to cut down on the loss of heat and noise and also reduce heating costs. With modern coatings and argon or krypton gas fills they are also very energy efficient.

The new unit, which was built to exact measurements, is awaiting its place. It needs care and precision. This is a moment that stops the world and puts your effort into perspective.

Remove the Old Unit

Removing the old unit is a crucial step to ensure that your new double-glazed window is built to exact measurements. Clean the frame carefully to get rid of dust, dirt, or old sealant. Repair any damage that is present. Repairs of minor amounts can be made by using wood filler or sanding but major damage might require professional repair.

After the glass has been removed, it is necessary to determine its width, height and thickness. The best way to do this is to take out the glazing beads that secure the unit. This is a delicate procedure that requires patience and caution. It is recommended that you take your time and wear safety equipment to protect yourself from unexpected shards of glass and accidental slips.

Begin by removing the bottom of the glazing strip with a sharp chisel, or a wide-bladed screwdriver. After the bead is removed, it is advisable to seek assistance from someone to hold the sealed unit while you remove the remaining beads. The unit could fall from the frame and break.

Once all the beads have been removed, it's essential to carefully measure the dimensions of the width, height and thickness of the unit that is currently in use. The measurements to create a replacement unit. It can also be used as a guideline to ensure that the new unit is constructed correctly for the frame. This is important because a misfit will not only cause the need to take down and reassemble the entire window but will reduce the efficiency and performance of the window. This is particularly important in Australia as our homes are frequently exposed 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, be sure that your new window is of the correct size. UPVC frames have very little movement and double-glazed units that is just a few millimeters oversize will not fit. Be sure to measure carefully and consult a professional or manufacturer's guide in order to make sure you get accurate measurements.

Once you have a clear understanding of the dimensions of your replacement, and you are sure it's fitted correctly take the glass out of its frame. Be sure to work in a well-lit area, and wear safety equipment, such as gloves, to avoid injury from glass shards. Make use of a putty blade to remove the glazing beads or stripes that secure the glass in the frame from the edges of the pane. You should avoid slipping the glass or straining frame.

Verify that the frame will open and close easily when the new double-glazing unit sealed is installed.  replacement upvc door seal  should be a tight fit, but you are able to adjust this if necessary by removing or adding packers. For example, if the frame is a sliding door, you may have to add extra packers on the hinge's side and in the opposite corners to stop the sash from getting caught or shaking when it opens.

Then, clean the frame. Take off any old sealant or glazing tape If necessary. Assess any damage, and make minor repairs if required using wood filler or sanding. The frame will be rehabilitated with a final cleaning and inspection, allowing it to withstand Australia's harsh weather for years.

Lifting the New Unit

Over time, double-glazed units can experience problems like condensation between the 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 usually 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 expanding of the glass during changing seasons and changes in temperature within the home.

Once the frame is cleaned and ready and clean, you can lift the new unit into place. This is an exciting moment, as you've just created a positive impact on your home, improving its warmth in winter and cooling in summer, whilst also aiding in reducing the cost of energy.

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

If you have glazing tape or sealing tape on your windows, this is the time to put a small bead around the perimeter of the glass. This creates a strong barrier that will prevent air and moisture from entering the window. Tighten the sealant with care making sure it's secure, but not tight enough to strain the frame or glass. Then, give yourself a pat on the back for a job well done, and then enjoy your newly-installed double-glazed window!

Secure the Unit

This is when your work is complete. The unit will be firmly seated in the frame, and a fresh sealant will be applied to its perimeter. The unit is now secure to withstand Australia's varying weather conditions, a guarantee for warm temperatures in winter and cool temperatures in summer. This is the precise measurements and removal is validated as a proof that the product was designed according to the exact dimensions.

It is essential to find the perfect balance between securing the unit without stressing the glass. If it's too loose, the unit might lose its airtight seal. If it's too tight, it might cause damage to the frame or weaken the material. Each screw has to find its original location, turning just enough to secure the unit without putting pressure too heavily on it.

This is the final stage in a transformational plan that improves a home's comfort and energy efficiency as well as its appearance. With the new double glazed unit firmly seated in the frame and secured with an all-new layer of sealant around the perimeter it is the moment that signifies the completion of your project.

The cavity that acts as an insulator between the panes of glass is filled with either argon gas or a desiccant. Argon is, in contrast to air, has a lower thermal conductivity, which decreases heat transfer. Desiccants also absorb moisture from the air, which prevents condensation and mould from the frame. The spacer bar, which is typically made of aluminium is also an essential component of the insulating system. The aluminium prevents the transfer of heat, but also keeps the edges of the glass that is insulated warm to prevent condensation.

Be sure to check your work

When you've installed the new unit and sprayed a bead of silicone sealant to the edge it is essential to allow it to set. Don't touch it! It will take at least four hours for the silicone sealant to reach its maximum strength and create an impenetrable barrier. While you wait, assess your work to determine whether there are any gaps or issues that could impact the efficiency or appearance.

This is also a great time to examine the seals and frame for indications of damage that require attention, and to assess whether replacement of the entire window is needed. A damaged seal can affect the efficiency of your home's energy usage as it can lead to drafts and cold spots. It can also allow ultraviolet rays to infiltrate the house, leading to fading of furniture and decreasing the life of carpets and curtains.


If you're experiencing any of these problems, your double glazing may require replacement. If you take care of it promptly, it can lower your energy costs and create a more comfortable and relaxed living space.

It is a complex and labor-intensive procedure that requires the correct equipment, precise measuring and careful preparation. It is not an DIY task and should only be handled by a professional in uPVC windows and doors who can guarantee the proper fitting of the replacement unit, and protect your home from the elements. Their experience and expertise will ensure that your double glazed unit is a quiet and efficient balance of warmth in the winter and coolness in summer, protecting your home from the elements.