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Replacement Double Glazed Units Over time, double glazed units (or sealed units as they are usually known) will break down. This usually happens because the insulating properties in the inert gas between glass panes degrade. If a window has been damaged down, it is essential to replace it to ensure your home is well-insulated and energy efficient. Luckily, the task is easy and straightforward to do at home. Installation If the window was put in correctly, the new unit should be able to fit comfortably and securely inside the frame. If the new glazed unit isn't of the same thickness as the old one, then you might need to adjust the existing “packers” (usually blue or red slips of plastic) in the frame to ensure that it is properly positioned. Ask your installer for instructions from the manufacturer if you're not sure. A high-quality replacement double-glazed unit is made to exacting standards and should fit your frame with ease. A small error can have a significant impact on the performance of your window. Modern double glazed units are a great energy efficient addition to any home. They use the argon gas between the panes in order to insulate and reduce the amount of heat that can escape your property during cold weather. However, in some cases, these units fail or have issues with their seals. This is usually the case when moisture enters the air cavity of the glass and creates condensation between the panes. The moisture that is absorbed by the window's cavity is not just ugly, but also affects the effectiveness and efficiency of the glazed unit. You can spot a cloudy or a misty appearance between the window panes. This indicates that the seal between two panes has ruptured and moisture is pouring in to your living space. The first thing you need to do is to take off the glass beads that surround the edges of your window. It's tricky and messy, but it's worth the effort because you will be able to access the wedge gasket that holds your glass in position. You will need to remove the beads with care to ensure that they do not break and it's often recommended to seek assistance at this point. Once 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 precisely measure the height, width and the thickness. This is important as it will determine the dimensions of the wedge gasket that you need to cut for the new double glazed sealed unit. Checking Double glazing units, or sealed units, as they are often called, can degrade over time. This is usually because of a crack in the seal, which allows moisture and condensation to enter the space between the panes. This affects how the window can keep out cold air, heat generated by the heating system within the home, and solar gain inside the window. Seal failure can also cause draughts to be felt within the home. Double glazed windows should be examined frequently for indications of failure. The presence of mist or moisture between the glass is an sign that the seal has failed and a replacement unit should be put in place. If you have to replace a sealed unit, it is vital that the replacement unit is the right size to fit. The uPVC frames on which the sealed unit is placed have a very small tolerance for movement, which means that even a few millimetres can affect the performance of the windows. Consult a professional or the instructions supplied by the manufacturer to ensure that you purchase the right size. With double glazing seal repair of a friend holding the new unit gently slide it into place in the frame. It is essential that you do this in a secure place because the glass is fragile and may break or fall out. After the sealed unit has been secured to the frame reconnect any packers at the bottom of the frame, and then replace the glazing beads back into their original position. After you have completed this, give the entire window a visual inspection to ensure there aren't any gaps or areas of misalignment that could impact its performance. It may be necessary to apply a small amount of sealant to the outer edge of the frame to prevent it from moving in future. It is also a good idea to check the thickness of the glass unit. Double glazed units come in different thicknesses. Using the wrong one could have a negative effect on the value of your home. Sealing Double glazing can increase the thermal efficiency of your home and also offer better audio. Over time, the seals on the glass can wear out resulting in misted or drooping windows. In these instances, replacement is essential. It is a good idea to consult a double-glazing professional who can help you choose the best glass products, make precise measurements and ensure that the installation is done correctly. The first thing to be done when replacing the sealed unit is to clean the frame. You can use an old paint brush (4 inch is ideal) to sweep the frame out by removing dust and cobwebs which have built up within the frame over time. After the frame has been cleaned, it's best to give the new seals a thorough clean too. It is easiest to remove the gaskets that are wedge-shaped from the friction joint by placing your hands on the edge of the gasket and pulling it away. It is also important to make notes of the length that you require for your new seals as it will be useful in cutting them to the required size. Once the gaskets are clean and the frame is clean, it's time to install the sealed unit. It's a good idea take off the beads (the UPVC frames clips that are used to hold the glasses) and then measure the size of them. This will ensure that the seal is built according to the correct dimensions and will not leave any gaps around it. After the beads have been placed back in, you are able to begin with the top one and move down to the others. After sealing the units, you should not touch them for a few hours because the silicone sealant has to set and harden. I typically wait 6 hours to handle it, but the silicone sealant's time to set will differ. Finalization The sealing and finalization of the project is now necessary once the new double-glazed unit is been securely installed within its frame. This is more than a physical conclusion to the project. It's an assurance that your home is now ready to withstand the elements with its new safe guardian in place. The first step involves cleaning the frame and removing any glazing beads, strips or other materials used to fix the old glass. The frame is then cleaned of dirt, sealant or glazing tape. This process also rejuvenates the aluminium or timber frame. It's also a good time to evaluate any damages and make small repairs, using wood filler or sanding as required. For more serious damage, you should seek out a professional. The spacer tubes are then be filled with desiccants in order to absorb any moisture that might have accumulated between the two panes during production or over time. This is a standard procedure for units with warm edges. Thermoseal Group stocks a range of desiccants as well as manual or automated dispensers for desiccant. After the spacers have been filled with the spacers, the glass and frame are sealed using a high-performance silicon, specifically designed to withstand Australia's tough climate. This sealant creates an airtight barrier that is both durable and flexible that can expand and contract without breaking. It is essential to choose the right thickness since any gaps could affect the thermal performance. If you're not sure about the proper thickness seek advice from an expert or the manufacturer's guidelines. The final step is to apply a secondary sealant, which is typically polyisobutylene (PIB) or similar products. It is applied to the outside edges of frames to create an additional seal. It can repel moisture and prevent air infiltration, thus increasing energy efficiency. The frame is then finished with an aluminum cladding. This protective coating is able to endure the elements and keep your frame looking fresh for many years. This is a wise investment to ensure the longevity and beauty of your home's frames, especially if you have federation or period homes with wooden frames that are prone to get rotted.