Marianne Martinez
Double-pane windows are a standard feature in modern homes, offering better insulation and noise control than single-pane windows. Over time, the seal between the two panes can break, causing water to condense between the panes, or one of the panes may crack, requiring repair or replacement. While some opt to restore the window's airtight seal, this is a labour-intensive process, and it is often more cost-effective to replace the glass unit. Homeowners can choose to replace just the panes if the window frame is in good condition, typically if it is less than 15 years old and made of vinyl or aluminium. However, if the frame is outdated or in poor condition, it may be necessary to replace the entire window.
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What You'll Learn
When to call a professional
While it is possible to replace double-pane glass in aluminium windows yourself, there are some situations in which it is best to call a professional.
Firstly, if your window frame is in poor condition, it is recommended that you replace it. This is a job for a professional, as it is a more complex task than simply replacing the glass. If your frame is outdated, you may also choose to replace it, and a professional can help you make the right decision based on factors such as your home's style and your budget.
Secondly, if the airtight seal between the two panes of glass breaks, you should call a specialist. This is because the window's service life will significantly decrease, and mould and other issues may start to appear. While it is technically possible to restore the tightness of the glass unit, this is a time-consuming and labour-intensive job, and in most cases, it is much easier to buy a new glass unit and call a professional to install it.
Thirdly, if your window is in a hard-to-reach place, it may be best to call a professional for safety reasons.
Finally, if you are unsure about any aspect of the repair or replacement process, it is always best to seek professional advice. A glass expert can help you decide between repairing and replacing your window, and a specialist will be able to evaluate your window repair needs and advise you on the best course of action.
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Removing the sash
To remove the sash from an aluminium window, you will need a few essential tools. These include a flathead and Phillips screwdriver, pliers, safety glasses, gloves, and a dust mask if you're working in a dusty environment.
First, close the window completely and use a screwdriver to remove any locks or latches. Place a sturdy support under the sash to prevent it from falling and clear the area around the window. Locate the spiral balancer at the sides of the window frame—these are the mechanisms that help hold the sash in place. Carefully unwind the spiral by turning it counterclockwise to release the tension. Make sure to support the sash while you do this to prevent it from falling. Once the tension is released, you can safely remove the sash.
If your window has rubber gaskets on the interior faces of the tracks, you may need to pry them out with a screwdriver. You can then slide the sash upwards and tilt it out. Be careful when removing the sash, as there may be springs attached that can cause the sash to come undone suddenly.
If your window has a cable attached to the sash, you will need to disconnect it before removing the sash. Make sure to also check for any debris or dirt in the window track, as this can cause resistance when trying to remove the sash. You can use a silicone spray to help the sash slide more easily.
Once the sash is removed, place it on a soft surface to avoid scratches or damage. If you need to store it for an extended period, wrap it in a blanket or bubble wrap and keep it in a dry area to prevent moisture damage.
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Measuring the glass
Step 1: Remove the Broken Glass and Clean the Frame
Start by putting on some heavy, slash-proof gloves for safety. Carefully remove the broken glass from the frame and dispose of it properly. Be sure to keep a piece of the broken glass, as you will need it to match the type and age of the glass for the replacement. Once the glass is removed, clean the frame thoroughly, removing any glazing, adhesive, or other objects with a screwdriver or small pry bar.
Step 2: Measure the Full Interior Width and Height of the Frame
Use a tape measure to determine the full interior width and height of the frame opening. Take measurements at the left, middle, and right sides of the window for the height, and at the top, middle, and bottom for the width. Circle the smallest measurement of the three figures for both height and width. These dimensions will be used to order the replacement glass.
Step 3: Determine the "Tight Fit" Dimensions
The space where the glass must fit is larger than the hole you see, so simply measuring the hole is not enough. You need to determine the "tight fit" dimensions, which refer to the recess into which the glass fits. Locate the outer edges of the glazing beading (the strips of wood or plastic that overlap the edges of the glass) and measure the horizontal distance between the two outer edges on either side of the window.
Step 4: Make Adjustments to the Measurements
To allow for the frame to expand and contract without compressing and fracturing the glass, you need to make some adjustments to your measurements. Deduct 1/8 inch from each side of every dimension, resulting in a total deduction of 1/4 inch from the original measurement. These adjusted measurements will be used for cutting the new sheet of glass.
Step 5: Measure the Thickness of the Glass
If you are unable to take a piece of the old glass with you to match the thickness, you will need to measure the thickness of the glass. Use a glass measurement gauge by placing it on the corner of a piece of glass and pressing the red button. Hold it down and view the screen from a 45-degree angle. The second laser line will indicate the glass thickness.
By following these steps, you can ensure that you have accurate measurements for your replacement double pane glass for your aluminium window.
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Sealing the glass
If your double-pane window glass is cracked, foggy, or broken, you may not need to replace the entire window. You can call a glass expert to repair the pane or the aluminium frame.
Double-pane windows consist of two sheets of glass sealed together with a bit of space between them. This airspace between the two panes is often filled with argon or krypton gas to provide further energy-efficient insulating properties. When this airtight seal breaks, or just one of the two panes cracks, windows can get foggy or drafty, which eventually leads to a need for repair.
Double-pane glass consists of two panes of glass separated by air. A spacer keeps the glass apart and seals the space between them. This space is usually filled with a special material to absorb moisture, called a desiccant. Sometimes, the seal between the double-pane windows breaks. The desiccant becomes saturated, and water begins to condense between the panes of your windows. This is common in older windows and is usually due to one of three things: water damage deteriorating the seal, direct sun exposure causing the window to expand and contract and weakening the seal, or the seal reaching the end of its lifespan.
If your window is under a “no fog” guarantee, the manufacturer may replace the glass for free. You can find the manufacturer by looking for a name or ID number on the aluminium spacer between the panes. If your window is not under warranty, you can call a glass company to measure and replace the glass.
To replace the glass, the sash (the part that slides up and down) is removed from the frame. The sash is then disassembled by removing the screws at the corners. If the IGU (double-paned insulating glass unit) has a rubber boot (marine glazing) around it, that can be reused. If it has two-faced tape glazing, you will need to get the right size and thickness of tape. Once you have the measurements, you can order the glass and install it when it arrives.
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Choosing a new frame
If your double-pane window glass is cracked, you may not need to replace the entire window. Usually, you only need to replace your window if you want a new type of frame.
When choosing a new frame, you should consider the following:
Material
The most common types of window frames are vinyl, aluminum, and wood. Vinyl is a good option for energy efficiency, while aluminum is a durable choice. Wood frames can add a natural, traditional look to your home.
Operating type
You may also want to consider changing the operating type of your window. Some options include double-hung, single-hung, and casement windows. Matching the style of your other windows can help create a cohesive look for your home.
Size and compatibility
It is important to ensure that the new frame is the correct size and is compatible with your existing window sashes. Measure the height, width, and opening of your current window to ensure the new frame will fit properly.
Installation process
Consider the ease of installation when choosing a new frame. Aluminum windows, for example, can often be repaired in place without removing the sash, making the process simpler.
Cost
The cost of the frame and installation should be considered. Compare prices from different suppliers and installers to find the best option for your budget.
Overall, when choosing a new window frame, it is important to consider the material, operating type, size compatibility, installation process, and cost to ensure you make the best decision for your needs and preferences.
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Frequently asked questions
Yes, it is possible to replace the glass in double-pane aluminium windows yourself. However, it is a tricky job and it is recommended that you call a professional window repair company. If you do decide to do it yourself, make sure to wear gloves and eye protection.
No, you can usually repair the glass while the window is still in the frame. However, some people recommend removing the sash and laying it flat to make the job easier.
First, remove the vinyl strip from the aluminium frame by using a flat-head screwdriver or putty knife to pop it out. Then, clean the frame and remove any shards of glass or remaining silicone. Next, measure the height, width, and opening of the pane, as well as the thickness of the old glass. Finally, order a new pane of glass in the correct size or cut a large glass sheet to the correct size yourself.
Yes, it is possible to replace just one pane of a double-pane window if the other pane and the frame are still in good condition. However, if the seal between the panes is broken, the window may need to be completely replaced.
