Replacement Double Glazed Units
Over time double glazed units (or sealed units as they are commonly called) will break down. This is usually the case because the insulating properties in the inert gas between the glass panes degrade.
If a window has been damaged down, it is essential to replace the unit to ensure your home is properly insulated and energy efficient. Fortunately the task is relatively easy and straightforward to do at home.
Installation
If the window was installed correctly, the new window will fit snugly and securely inside the frame. If the new window is not the same size as your old one you may need to adjust the 'packers (usually blue or red plastic slips) within the frame. If you are unsure how to do this then consult your installer or the instructions of the manufacturer for advice.
A good replacement double glazed sealed unit is made to the highest standards and should fit into your frame with a minimum of hassle. 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 a fantastic energy efficient addition to any home. They use a layer argon between the panes glass to insulate and cut down on the amount of heat that can escape from your home in cold weather.
However, in some cases, these units fail or have issues with their seals. This is usually the case when moisture is introduced into the air cavity of the glass and causes condensation between the panes. Moisture in the windows' cavity is not just ugly, but also affects the efficiency and effectiveness of the glass unit.
Condensation can be caused by a range of causes. The most effective method to determine the cause is to look for a hazy or misty look between the windows. This is a sign that the seal between the two panes of glass has broken down and moisture is leaking into your living spaces.
The first step to take is to remove the glazing beads around the edges of your window. This can be tricky and a bit messy but is well worth the effort since it lets you access the wedge gasket that keeps your glass in place. You will need to remove the beads with care to ensure that they don't break and it's often recommended to ask for assistance at this stage. Once the beads are removed, allow the sealed unit to slide a bit out of the frame. With the help of a person to hold it in place while you accurately determine its width, height and thickness. This is crucial because it will determine the size wedge gasket to cut for your newly double-glazed sealed units.
Checking
Double glazing units, or sealed units as they are commonly called and can fail in time. This usually happens due to a break in the seal that allows condensation and moisture to infiltrate the space between the panes. This affects how the window is able to keep out cold air, heat produced by the heating system inside the home, and solar gain inside the window.
Failing seals can also cause draughts to be felt in the home. Double-glazed windows should be inspected regularly for signs of failure. Moisture or misting in between the glass is a strong indication that the seal has failed and a replacement unit is required.
If you do need to replace a sealed unit, it is vital that the new one is of the right size to fit. The uPVC frames in which the sealed unit is installed have a very limited tolerance for movement, which means that even a few millimetres of movement can impact the performance of the windows. Get advice from a professional or follow the guidelines that is provided by the manufacturer to ensure that you purchase the right size.
With the help of a friend holding the new unit gently move it into the frame. It is vital to place it in a secure place since the glass is fragile and could fall out and break. Once the sealed unit has been secured to the frame attach any packers that are on the bottom of frame and then replace the glazing beads back into their original position. Once you've completed this take the window for a thorough visual inspection to ensure that there are no gaps, and that it is not misaligned.
You may have to add a small amount of sealant around the edges of the frame to prevent it from moving. It is recommended to re-check the thickness of the glass unit. This is crucial since double-glazed units come in different thicknesses, and using the wrong thickness could affect the u-value of your home's insulation.
Sealing
Double glazing is an excellent option to boost your home's thermal efficiency as well as enhance audio quality by decreasing the transfer of sound. Over time, the seals on the glass may get worn out, leading to windows that are drooping or misty. In these instances, replacement is necessary. It is a good idea to collaborate with an experienced double glazing contractor who can assist you in selecting the appropriate glass, ensure accurate measurements and ensure proper installations.
When replacing a sealed unit the first thing you need to do is clean the frame. Use a paintbrush from the past (4 inches is the ideal size) to clean the frame, getting rid of dust that has accumulated over time. After the frame has been cleaned, it's a good idea give the new seals a clean too. The easiest method for doing this is to pull out the Wedge gaskets by putting your fingers on the edge, and then pulling it out until you reach the point where it overlaps with the friction joint. You should also make a note of the length that you require to make your new seals, as it will be helpful in cutting them to the required size.
Installation of the sealed unit is simple once the frame and gaskets have been cleaned. It's a great idea to take off the beads (the UPVC frames clips that hold the glasses) and measure them. This will ensure that the seal is constructed to the correct dimensions and there aren't any gaps in it.
Once the beads are back in place, you can put in the top bead, and then move on to the next three. Be cautious not to touch the sealed units for a few minutes afterward as the silicone sealant will require time to set and become hard before you can handle it again. I usually let it sit for about 6 hours before handling but this could differ based on your silicone sealant's setting times.
Finalization
The sealing and finalization of the project is now required once the new double-glazed unit has been installed securely within its frame. This is more than a physical closure to the project; it's an assurance that your house is now ready to withstand the elements with a new, secure guardian safely in its 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 then cleaned of any dirt, old sealant and glazing tape. This process also rejuvenates either 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 for repair.
The spacer tubes will then be filled with desiccants to take in any moisture that could be trapped between the two panes in the process of manufacturing or over time. Replacement rubber gutter seals is the standard procedure for warm edge sealed unit. Thermoseal Group stocks a range of desiccants and manual or automatic desiccant dispensers.
After the spacers are filled with glass, it is sealed with a high performance silicone designed to withstand Australia's harsh climate. This sealant forms a barrier that's both robust and flexible, able to expand and expand without becoming brittle or breaking. It's crucial to select the right thickness, as any gaps could affect thermal performance. Ask a professional for advice or refer to the manufacturer's manual in case you're not sure about the right thickness for your.
The final step is adding secondary sealant. This is usually polyisobutylene, or a similar substance. This is applied along the outside edges of frames to form a secondary seal. It will ward off moisture and block air infiltration, thus increasing energy efficiency.
The frame is finished with aluminum cladding. This protective coating can withstand the weather and keep your frame looking brand new for many years. This is a wise investment to ensure the durability and beauty of your home's frames, especially if you have period or federation style homes with timber frames that are susceptible to rot.