Notes

What's Holding Back In The Replacement Double Glazing Sealed Units Industry?
Replacement Double Glazed Units

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

It is essential to replace a damaged window to ensure that your home is fully energy efficient and well-insulated. Fortunately the task is relatively simple and easy to complete at home.

Installation

If the window was put in correctly, the new window should fit comfortably and firmly within the frame. If the new glazed panel isn't the same thickness as the old one it may be necessary to adjust the 'packers' (usually red or bluish plastic slips) in the frame. Ask your installer for instructions from the manufacturer if you're unsure.

A high-quality replacement double-glazed unit is constructed to exacting standards and should fit your frame with minimal fuss. However, a small error can have an enormous impact on the performance of your window, and should therefore be checked attentively.


Modern double-glazed units can be a great addition to any home. They are energy efficient and can save you money. They are constructed with a layer of argon gas between the panes to insulate and reduce the amount of heat that could escape your home in cold weather.

However, there are times when these units may fail or have problems with their seals. This is usually the case when moisture enters the air cavity of the glass, causing condensation between the panes. Moisture in your window cavity is not just ugly, but it also reduces the efficiency of the glass unit.

Look for a fogginess or misty appearance in 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 step to take is to take the glazing beads off around the edges of your window. It can be tricky and messy, but it is worth the effort because you will have access to the wedge gasket which keeps your glass in place. It is crucial to take care when removing the beads to ensure they don't break. It is advisable to ask for help. be a good idea at this point. Once the beads have been removed, allow the sealed unit to slide a bit out of the frame. With a helper to hold it in place while you accurately measure its size, height and width. This information is vital because it will determine the size wedge gasket to cut for your brand new double glazed sealed units.

Checking

Double glazing units or sealed units as they are commonly called, can break down over time. This is usually because of a crack in the seal that allows condensation and moisture to enter the space between the panes. This will affect the ability of the window to keep cold air out, and warm generated by the home's heating in, and solar gain from the sun's rays inside.

Seal failure can also cause draughts to be felt in the home. Double-glazed windows must be inspected regularly for indications of failure. If you see water or mists between the glass, it is an indication that the seal is failing and a replacement unit must be installed.

If you must replace a sealed unit it is vital that the new unit is of the right size to fit. The uPVC frames that the sealed unit is positioned have a very small tolerance for movement, which means that even a few millimetres of movement can impact the performance of the windows. To be certain that you are ordering the correct size, it is best to consult a professional or the manufacturer's manual.

Slide the new unit into the frame with the assistance of a partner. It is essential that you make this move in a secure location as the glass is fragile and can break or fall out. After the sealed unit is secure in the frame re-attach any packers at the bottom of the frame, and then put the glazing beads back into their original position. Once you have done this give the entire window a thorough examination to ensure that there aren't any gaps or misalignments that could affect its performance.

You may need to add a small amount of sealant around the perimeter of the frame to stop it from moving. It is also a good idea to check the thickness of the glass unit. Double glazed units come in different thicknesses. If you choose the wrong one, it can have a negative impact on the u value of your home.

Sealing

Replacement uPVC Double Glazed Window And Door Seals glazing can boost the thermal efficiency of your home and also improve acoustics. Over time the seals of the glass may get worn out, leading to misted or drooping windows. In these instances replacement is needed. It is recommended to consult a professional double glazing installer who can help choose the right glass products, ensure accurate measurements and ensure proper installations.

If you are replacing a sealed unit, the first step is clean the frame. Use an old paintbrush (4 inches is ideal) to clean the frame, removing dust that has accumulated over time. When the frame is clean, it's best to give the seals that are new a thorough clean too. The easiest method for doing this is to lever out the gaskets on the Wedge by placing your fingers on the edge and pulling it out until you reach the point that it overlaps with the friction joint. You should also make notes of the length you need for your new seals as it will be helpful when cutting them to size.

The installation of the sealed unit is straightforward after the gaskets and frame have been cleaned. It's a good idea remove the beads (the UPVC frames clips that hold the glasses) and then measure them. This will ensure that the seal is built to the right size and won't leave any gaps around it.

After the beads are in their place, you can insert the first bead and work your way round to the remaining three. You should be careful not to touch your sealed units for a while afterward as the silicone sealant will need some time to set and become hard before you are able to handle it again. I typically wait 6 hours to handle it, however the silicone sealant's setting time can vary.

Finalization

When the new double-glazed unit is secure within its frame and is sealed, it's time to seal and complete. This is more than a physical conclusion to the work; it's an affirmation that your home is now ready to withstand the elements with a new, secure guardian safely in place.

The first step is to clean the frame, by carefully removing any glazing strips or beads that bonded the old glass. The frame is cleaned of dirt, old sealant, and glazing tape, a procedure that also revitalizes the wood or aluminium of the window's frame. This is also the time to make any minor repairs with wood filler and sanding, if necessary. The most serious damage should be taken to a professional to repair.

The spacer tubes will then be filled with desiccants to take in any moisture that could 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 automated desiccant dispensing machines.

After the spacers have been filled with glass, the frame and glass are sealed with a high-performance silicone specifically designed to withstand Australia's tough climate. The sealant creates a barrier that's both robust and flexible capable of expanding and contract without becoming fragile or breaking. It is essential to choose the correct thickness, since any gaps can impact thermal performance. If you're not sure of the proper thickness you should consult an expert or a manufacturer's guide.

The final step is adding secondary sealant. It is typically polyisobutylene, or a similar substance. This is applied along the outside edges of frames to create an additional seal. It will ward off moisture and block air infiltration, thereby increasing the efficiency of energy.

The frame is then adorned with an aluminum cladding. This protective coating can withstand the weather and keep your frame looking new for a long time. It's a wise investment in the long-term stability of your home's frame especially in the case of historic homes or federation homes, where timber frames are susceptible to decay and rot.

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