Replacement Double Glazed Units
Over time, double glazed units (or sealed units as they are commonly known) may break down. This happens because the insulating qualities of the inert gases between the glass panes are broken down.
It's important to replace a damaged or broken window to ensure that your home is fully energy efficient and well-insulated. The task is relatively easy and straightforward.
Installation
If the window has been installed correctly, the new unit will fit snugly and will fit comfortably within the frame. If the new glazed window isn't the same thickness as the old one it may be necessary to adjust the 'packers' (usually red or bluish plastic slips) within the frame. Ask your installer for instructions provided by the manufacturer if you're not sure.
A top-quality replacement double-glazed sealed unit is constructed to exacting standards, and should fit in your frame with no hassle. A small error can have a significant impact on the performance of your window.
Modern double-glazed units are a fantastic energy efficient addition to any home. They use a layer of argon gas between the panes to insulate and reduce the amount of heat that can escape from your home during cold winter months.
However, in some cases, these units fail or have problems with their seals. This typically happens when moisture gets into the air cavity of the glass and causes condensation between the panes. The moisture that is absorbed by the window's cavity is not just ugly, but also decreases the efficiency and effectiveness of the glass unit.
Check for a fogginess or a misty appearance between the window panes. This is a sign that the seal between the two glass panes has broken down and moisture is leaking into your living spaces.
The first step is to remove the glazing beads from around the edges of your window. This can be a little difficult and messy, but it is worth the effort since it allows you to access the gasket that keeps your glass in place. You will need to remove the beads with care so that they do not break and it's often recommended to ask for assistance at this stage. After the beads have been removed, allow the sealed unit a little to fall out of the frame. With a helper, hold it in place while you take measurements of its width, height and thickness. This information is essential as it will determine what size wedge gasket you will need to cut for your brand new double glazed sealed units.
Checking
Double glazing units, or sealed units, as they are often called, can degrade over time. This is usually due to a break in the seal, which allows moisture and condensation to get into the space between the panes. This can affect the capacity of the window to keep cold air out, warmth generated by the home's heating in, and solar energy from the sun's rays inside.
The failure of seals can cause draughts to be felt within the home. Double glazed windows should be inspected regularly for indications of failure. The presence of mist or moisture between the glass is a clear indication that the seal has failed and a replacement should be installed.
It is important that you replace the sealed unit with the proper size. The uPVC frames on which the sealed unit is installed have a very small tolerance for movement, so even a few millimetres can alter the performance of windows. To ensure that you're getting the right size it is best to seek advice from an expert or the manufacturer's guidelines.
Slide window gaskets replacement into the frame with the help of a friend. It is essential that you place it in a secure location because the glass is fragile and may break or fall out. Once the sealed unit is secure in the frame, reconnect any packers at the bottom of the frame, and then put the glazing beads back in their original positions. Once you've completed this take the window for an inspection thoroughly to make sure there are no gaps and that it isn't misaligned.
It is possible to apply a small amount of sealant around the edges of the frame to stop it from moving. It is also a good idea to re-check the thickness of the glass unit. Double-glazed units are available in various thicknesses. If you choose the wrong one, it can have a negative impact on the value of your home.
Sealing
Double glazing can boost the thermal efficiency of your home, and improve sound insulation. However, over time, the seals in the glass can get worn out, leading to misty windows and a reduction in performance. In these instances replacement is required. It is recommended to collaborate with a professional double glazing installer who can help you choose the best glass products, ensure accurate measurements and ensure proper installations.
If you are replacing a sealed unit the first thing to do is clean the frame. Make use of an old paintbrush (4 inches is the ideal size) to clean the frame, taking off dust that has built up over time. When the frame is clean, it's a good idea to give the new seals a thorough clean too. It is easiest to remove gaskets for the wedge from the friction joint by placing your fingers on the edge of the gasket and pulling it out. You should also make a note of the length that you require for your new seals as it will be helpful in cutting them to the required size.
Once the gaskets are cleaned and the frame cleaned up it's time for the sealed unit. To get the best results when doing this, it's recommended to prise out the beads (the UPVC frame clips that hold the glass) and then measure them. This will ensure that the seal is constructed according to the correct dimensions and won't leave any gaps around it.
After the beads are put back in, you can begin with the top one and work your way to the lower ones. Be cautious not to touch the sealed units for a few minutes afterward, as the silicone sealant will need some time to set and become hard before you are able to handle it again. I usually leave it for about 6 hours prior handling but this will depend on the silicone sealant's set times.
Finalization
After the double-glazed unit is snugly in place within its frame and is sealed, it's time to seal and finish. This step is more than just a physical closure to the project; it's an assurance that your home is now ready to withstand the elements with its new, secure guardian safely in its place.
The first step is to clean the frame, taking care to remove any glazing beads or strips that secured the old glass. Then, the frame is cleaned of dirt and old sealant as well as glazing tape, a procedure that also revitalizes the wood or aluminium of the window's frame. It's also a good opportunity to assess any damage and make small repairs, using wood filler or sanding when needed. For more serious damage it is recommended to consult a professional.
The spacer tubes are then be filled with desiccants to absorb any moisture that might have accumulated between the two panes in the process of manufacturing or over time. This is a typical procedure for warm edge sealed units. Thermoseal Group stocks a range of desiccants and manual or automated dispensers of desiccant.
After the spacers have been filled with glass, it is sealed with a high performance silicone that's designed to withstand the harsh conditions of Australia's climate. This sealant forms a barrier that's durable and flexible, able to expand and contract without becoming brittle or breaking. It is crucial to choose the correct thickness as any gaps can affect thermal performance. If you're unsure of the correct thickness to use you should consult an expert or the manufacturer's guidelines.
The last step is to apply secondary sealant, which is typically polyisobutylene (PIB) or an equivalent product. This is applied to the outside edges of the frame, where it creates a secondary seal capable of repelling moisture and block air from entering and improve energy efficiency.
The frame is coated with aluminum cladding. It's a protective coating that can withstand the elements, keeping your frame looking brand new for many years to be. It's a smart investment for the long-term integrity of your home's frame, particularly in the case of historic homes or federation homes, where timber frames are susceptible to decay and rot.