Replacement Double Glazed Units
Double glazed units, or sealed units as they're also called, may wear out over time. This is usually the case due to the insulating properties of the inert gas that is between the glass panes break down.
It is essential to replace a damaged window to ensure that your home is energy efficient and insulated. The task is relatively simple and easy.
Installation
If the window was fitted correctly, the new window should be able to fit comfortably and securely within the frame. If the new unit isn't of the same thickness as the previous one, you may have to modify the existing 'packers' (usually blue or red slips of plastic) inside the frame to ensure it sits properly. Consult your installer or the instructions of the manufacturer if you're uncertain.
A top-quality replacement double-glazed sealed window is manufactured to the highest standards, and should fit into your frame with minimal fuss. However, double glazing seal repairs could have a huge impact on the performance of your window and should therefore be checked with care.
Modern double glazed units are a great energy efficient addition to any home. They are constructed with an argon gas layer between the panes to provide insulation and reduce the amount of heat that could escape from your home during cold winter months.
However, in some cases, these units fail or have problems with their seals. This usually occurs when moisture is introduced into the air cavity of the glass and creates condensation between the panes. Moisture in your window cavity is not just ugly, but it also reduces the efficiency of the glazed unit.
Look for a fogginess or a misty appearance between the window panes. This is a sign that the seal between two panes has broken and moisture is leaking in to your living space.
The first thing you need to do is to take off the glass beads that surround the window edges. It can be difficult and messy, however it is worth it as you will have access to the gasket for wedges that keeps your glass in place. It is crucial to remove the beads carefully so that they don't fall off. Asking for help can be beneficial at this stage. After the beads are removed, allow the sealed unit to fall slightly out of the frame and with an assistant, hold it in place while you measure it accurately length, width and the thickness. This information is essential because it will determine the dimensions of the wedge gasket that you need to cut for the double glazed unit.
Checking
Double glazing units or sealed units as they are usually called, may break down over time. This is usually due a leak in the seal that allows moisture and condensation into the space between the panes. This can affect the capacity of the window to keep cold air out, warm air produced by the heating system in, and solar energy from the sun inside.
Seal failure can also cause draughts in the home. Double-glazed windows should be examined often for signs of failure. If you see water or mist forming between the glass, this is an indication that the seal is failing and a replacement unit must be installed.
It is essential to replace the sealed unit with the proper size. The uPVC frames in which the sealed unit is placed have a tiny tolerance for movement, which means that even a few millimetres could alter the performance of windows. To be certain that you're ordering the right size it is best to seek advice from an expert or the manufacturer's guidelines.
Place the new unit into the frame with the assistance of a partner. It is vital to make this move in a secure location because the glass is fragile and may fall out and break. Once the sealed unit is secured in the frame re-attach any packers at the bottom of the frame and then place the glazing beads back in their original position. After you have completed this, give the entire window a thorough examination to ensure that there are no gaps or misalignments that could affect its performance.
It may be necessary to apply a small amount of sealant to the perimeter edge of the frame to prevent it from shifting in the future. It is recommended to re-check the thickness the glass unit. This is important as double glazed units are available in various thicknesses, and a wrong thickness could affect the u-value of your home's insulation.
Sealing
Double glazing can boost the thermal efficiency of your home, and provide better acoustics. However, over time, the glass's seals may be damaged, resulting in misty windows and a reduction in performance. In these cases replacement is needed. It is recommended to collaborate with a professional double glazing installer who can help you choose the appropriate glass to ensure accurate measurements and ensure proper installations.
If you are replacing a sealed unit the first step is clean the frame. Make use of an old paintbrush (4 inches is the ideal size) to clean the frame, removing dust that has accumulated over time. Once the frame is clean it's best to give the seals that are new a thorough clean too. It is easiest to remove the wedge gaskets from the friction joint by placing your fingers on the edge of the gasket and pulling it away. You should also make an outline of the length you need for your new seals since it will be useful when cutting them to size.
Installing the sealed unit is simple once the frame and gaskets have been cleaned. To get the best results from this it's a good idea to remove the beads (the UPVC frame clips that support the glass) and then measure these. This will ensure the seal is built to the correct size, and that there are no gaps around it.
After the beads are placed back in, you are able to begin with the top one and move down to the other. Be careful not to touch the sealed units for a while afterward as the silicone sealant will need some time to set and become hard before you can use it again. I usually leave it for about 6 hours before handling but this will vary based on your silicone sealant's setting time.
Finishing
Finishing the project and sealing it is now required once the double-glazed unit has been securely installed within its frame. This step is more than just a physical closure to the work; it's an assurance that your house is ready to weather the elements with its brand new, secure guardian safely in place.
The first step is to clean the frame taking care to remove any glazing strips or beads that held the old glass. The frame is then cleaned of dirt, sealant or glazing tape. This process also rejuvenates the aluminium or timber frame. This is also the moment to make any small repairs by using wood filler or sanding, if needed. Major damage should be referred to a professional to repair.
The spacer tubes are then be filled with desiccants in order to absorb any moisture that may have accumulated between the two panes during production or over time. This is a standard procedure for units with warm edges. Thermoseal Group stocks desiccants as well as manual and automatic desiccant dispensing devices.
After the spacers are filled and sealed, the glass is then sealed with a highly-performing silicone that is designed to withstand the harsh conditions of Australia's climate. This sealant creates an airtight seal that is both durable and flexible, and can expand and contract without breaking. It is crucial to choose the right thickness, as any gaps could affect the thermal performance. Talk to a professional or consult the manufacturer's manual for more information on the thickness to use.
The final step is to apply a an additional sealant, usually polyisobutylene (PIB) or a similar product. It is applied to the edges of frames to form a secondary seal. It will ward off moisture and block air infiltration, thereby increasing energy efficiency.
Then, the frame is finished with aluminum cladding. This protective coating is able to withstand the weather and keep your frame looking brand new for many years. This is a wise investment to ensure the durability and the beauty of your home's frames, especially if you have federation or period style homes with wooden frames that are susceptible to get rotted.