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20 Resources That'll Make You Better At Replacement Double Glazing Sealed Units
Replacement Double Glazed Units

Over time, double glazed units (or sealed units as they are often known) can break down. This is usually the case due to the insulating properties of the inert gas between the glass panes break down.

When a window has broken down it's important to replace the window to ensure your home is fully insulated and energy efficient. Luckily, the task is easy and straightforward to do at home.

Installation

If the window is properly installed, the new window will fit firmly in place and will fit comfortably within the frame. If the new window is not the same size as your old one you may need to adjust the 'packers (usually red or bluish plastic slips) within the frame. Consult your installer or the instructions of the manufacturer if you're uncertain.

A good replacement double glazed sealed unit will be manufactured to the highest standards and should fit in your frame with a minimum of fuss. However, a small error can have an enormous impact on the performance of your window and must be inspected carefully.


Modern double-glazed units are an energy efficient addition to any home. They use an argon gas layer between the panes in order to insulate and reduce the amount of heat that could escape your home in cold winter months.

Sometimes, these units develop problems with their seals. This typically happens when moisture enters the air cavity of the glass and causes condensation between the panes. Moisture in your window cavity is not just ugly however it also decreases the efficiency of the glass unit.

Look for a fogginess or a misty appearance between the window panes. This is an indication that the seal between two panes is broken and moisture is leaking into your living space.

The first step is to take the glazing beads off around the edges of your window. It's tricky and messy, but it's worth it because you will be able to access the wedge gasket that holds your glass in position. It is crucial to remove the beads with care so that they don't fall off. A little help from a friend can be helpful at this stage. After the beads have been removed then allow the sealed unit a little to fall out of the frame. With the help of a person, hold it in place while you accurately take measurements of its length, width and height. This information is vital as it will help you determine the size wedge gasket you will need to cut for your new double glazed sealed units.

Checking

Double glazing units, or sealed units as they are often called they can break down in time. This usually happens due to a breach in the seal that allows condensation and moisture to infiltrate the space between the panes. This will affect how well the window can keep out cold air, heat generated by the heating system inside the home and solar gain inside.

The failure of seals can result in draughts being felt inside the home. Double-glazed windows must be checked often for signs of failure. Moisture or misting in between the glass is a strong sign that the seal has failed and a replacement should be put in place.

It is important that you replace the sealed unit with the proper size. The uPVC frames that the sealed unit sits in have a very limited tolerance for moving, so even just a few millimetres over can have an impact on the performance of the window. To ensure that you're getting the correct size, it is best to consult an expert or the manufacturer's guide.

Slide the new unit into the frame with the help of a friend. This must be done in a safe place as the glass can break if it falls. Once the sealed unit is secure within the frame, re-attach any packers that are at the bottom of the frame, and then put the glass beads back in their original position. Once you've completed this make sure you give the window a thorough visual inspection to ensure there are no gaps and that it is not misaligned.

It is also possible to apply a bit of sealant to the outer edge of the frame in order to prevent it from moving in the future. It is also a good idea to re-check the thickness the glass unit. Double glazed units come in different thicknesses. Making the wrong choice could have a negative effect on the u value of your home.

Sealing

Double glazing can boost the efficiency of your home and also improve sound insulation. Over time the seals of the glass may wear out resulting in condensation or drooping windows. In these instances replacement is required. It is recommended to collaborate with an experienced double glazing contractor who can help choose the appropriate glass, ensure accurate measurements and ensure proper installations.

The first thing that needs to be done when replacing an item that is sealed is to clean the frame. You can make use of an old paintbrush (4 inch is the best) to sweep the frame out, removing dust and cobwebs that build up in the frame over time. It's a good idea to clean the new seals after the frame has been cleaned. It is easy to remove the gaskets that are wedge-shaped from the friction joint by placing your fingers on the edge of the gasket and pulling it away. You should also take an outline of the length that you require for your new seals as it will help in cutting them to the required size.

Once the gaskets are clean and the frame is cleaned it's time for the sealed unit. It's a good idea to remove the beads (the UPVC frames clips that are used to hold the glasses) and measure them. This will ensure that the seal is constructed to the right size and there aren't any gaps in it.

After the beads have been put back in, you can begin with the top one and move to the lower ones. Be cautious not to touch the sealed units for a few minutes afterward as the silicone sealant needs time to set and become hard before you can handle it again. I usually leave it for about 6 hours prior to handling but this will vary based on your silicone sealant's setting time.

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Sealing and finishing the project is now required once the new double-glazed unit is been snugly installed within its frame. This step is more than a physical closure to the project; it's an assurance that your home is ready to weather the elements with its brand new secure guardian securely in the right place.

The first step involves cleaning the frame and taking out any glazing beads strips or other materials that were used to secure the old glass. The frame is cleaned of dirt and sealants that have been used for years, as well as glazing tape, a procedure that also revitalizes the wood or aluminium of the frame of the window. This is also the moment to make any small repairs using wood filler and sanding, if needed. Major damage should be referred to a professional to repair.

The spacer tubes will be filled with desiccants in order to absorb any moisture that might have been trapped between the two panes during production or over time. This is the standard procedure for a warm edge seal. Thermoseal Group stocks a range of desiccants, as well as manual and automated dispensers for desiccant.

After the spacers have been filled, the glass is sealed with a high-performance silicone designed to withstand Australia's harsh environment. The sealant creates a barrier that's durable and flexible capable of expanding and contract without becoming fragile or breaking. It is essential to choose the right thickness, as any gaps could impact the thermal performance. If you're not sure of the right thickness to use, consult with an expert or the manufacturer's guidelines.

The final step is to add secondary sealant. It is typically polyisobutylene or another similar material. It's applied to the edges of the frame's exterior, where it creates a secondary seal that's capable of repelling moisture and stop air penetration, helping to increase the efficiency of energy.

Then, the frame is coated with aluminum cladding. This protective coating can endure the elements and keep your frame looking brand new for a long time. It is a wise investment for the long-term integrity and the beauty of your home's frames, particularly if have period or federation style homes with timber frames that are susceptible to get rotted.

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