Replacing a sealed double-glazed unit is often a straightforward and cost-effective way to restore a window’s insulation and clarity without changing the entire frame.

Over time, glass units can develop condensation, lose efficiency, or become damaged, but swapping out just the sealed unit can resolve these issues while keeping costs low. 

This process can be tackled as a DIY project with the right tools and careful handling. Understanding when and how to replace the unit ensures better energy efficiency, improved aesthetics, and long-term savings.

Short Answer: Yes

In many cases, you can replace just the sealed double-glazed unit without the need to replace the entire window frame. The glass unit is the part of the window that provides insulation, and replacing it can restore its thermal efficiency and aesthetic appeal.

However, whether or not you can replace just the glass unit depends on the condition of the window frame and the type of double glazing in use.

• Replacement of the sealed unit is usually sufficient when the frame is intact and undamaged.
• Replacing the entire window may be necessary if the frame is also damaged or rotten.
• Cost-effectiveness: Replacing only the glass unit is often much cheaper than replacing the whole window.

Benefits Of Replacing Only The Sealed Unit

• Cost-saving: It’s a more budget-friendly option compared to full window replacement.
• Energy efficiency: A new sealed unit can improve insulation, helping reduce energy costs.
• Appearance: Fogged or damaged glass can be replaced, enhancing your window’s clarity and look.

Can I Replace The Sealed Double Glazed Unit Myself?

The DIY Approach To Replacing Sealed Double Glazed Units

If you’re handy with home improvement projects, replacing a sealed double-glazed unit can be a DIY task. However, it’s important to consider your skill level, the type of window, and whether you have the correct tools for the job. Below, we will outline the basic steps involved in replacing the unit.

Steps To Replace A Sealed Double Glazed Unit

Step 1: Prepare The Necessary Tools And Materials

Before you begin, make sure you have all the necessary tools and materials. These include:

• Measuring tape: To measure the dimensions of the existing unit.
• Flat pry bar or putty knife: To remove the glazing beads or sealant.
• Suction cups: For handling the glass unit safely.
• Replacement sealed double-glazed unit: Ensure it matches the size and specifications of the old unit.
• Sealant: For securing the new unit into place.
• Gloves: For safety when handling glass.

Step 2: Measure The Existing Sealed Unit

To ensure you order the correct replacement unit, you must measure the existing sealed unit accurately. This is crucial to ensure the new glass fits perfectly into the frame.

• Measure the width and height: Measure both the width and the height of the unit from edge to edge.
• Check for square: Double-check your measurements at various points to ensure the frame is square. If the window frame is out of square, the new unit may not fit correctly.

Step 3: Remove The Old Sealed Unit

Now that you have the correct measurements, you can proceed to remove the old sealed unit. The process of removing the glass unit may vary depending on the type of frame you have:

• For uPVC windows:
  • Use a flat tool, such as a putty knife or pry bar, to remove the glazing beads from around the window frame.
  • Once the beads are removed, carefully lift the glass out of the frame using suction cups to avoid touching the glass directly.
• For timber windows:
  • The glass is typically fixed with nails or screws, so you will need a hammer or screwdriver to remove these fasteners.
  • After removing the fasteners, gently pull the glass out of the frame.
• For aluminium windows:
  • Similar to uPVC windows, aluminium window frames also use glazing beads. Use a flat tool to gently remove the beads and take the glass out.

Step 4: Install The New Sealed Unit

After removing the old glass, it’s time to install the new sealed unit.

1. Clean the frame: Before placing the new unit, thoroughly clean the frame to ensure there’s no dirt or debris that could affect the seal.
2. Place the new unit: Carefully position the new sealed unit into the frame, ensuring that it sits evenly and securely.
3. Reinstall the glazing beads: Place the glazing beads around the new glass, pressing them into position to secure the unit in place.

Step 5: Apply Sealant And Finishing Touches

Once the new unit is in place and secured, you should apply a high-quality sealant around the edges to ensure there are no gaps. This will prevent drafts, moisture, or air from seeping into the unit, maintaining its energy efficiency.

• Apply sealant: Ensure that the sealant is applied evenly and smoothly to the perimeter of the glass.
• Clean the window: Wipe down the window with a cloth to remove any excess sealant and ensure the glass is clean.

Tips For Replacing Sealed Double Glazed Units

While replacing a sealed double-glazed unit can be a DIY project, there are several tips to ensure you do the job correctly and safely.

Tip 1: Handle The Glass Carefully

Glass is fragile, so always handle it with care. Use suction cups when lifting the unit to avoid putting pressure on the glass. Never lift the glass by the edges, as this can cause it to break.

Tip 2: Check The Frame Condition

Before installing a new unit, carefully inspect the window frame. If the frame is damaged, cracked, or rotten, it may not properly support the new sealed unit. In this case, it’s best to consult a professional to assess whether you need to replace the entire window.

Tip 3: Order The Correct Replacement Unit

Ensure that the new sealed unit you order matches the thickness, size, and type of the previous unit. Double-check the measurements to avoid ordering a unit that doesn’t fit properly.

Tip 4: Work With A Professional If Necessary

If you are unsure about any aspect of replacing the sealed double-glazed unit, consider hiring a professional. A professional glazier can ensure that the unit is replaced correctly and can also inspect the frame for any underlying issues that may require attention.

Tip 5: Consider Energy-Efficient Glass

If you’re replacing a sealed unit due to a damaged or aged one, it’s an ideal time to upgrade to energy-efficient glazing. Double-glazed units with Low-E glass or gas-filled cavities can further improve your home’s energy efficiency and comfort.

When Should You Call A Professional?

While DIY replacement is possible, there are times when it’s better to call in a professional:

• Damaged frame: If the window frame is damaged or deteriorating, it may not be able to support the new glass.
• Larger windows: If you’re replacing a large or heavy glass unit, professional help can make the job safer and easier.
• Lack of expertise: If you’re unsure of how to properly remove and install the unit, a professional can do the job with precision.

A professional will also be able to advise you if the frame requires repairs or if the issue with your double glazing goes beyond just the glass unit.

How Much Does It Cost To Replace Sealed Double Glazed Units?

The cost of replacing a sealed double-glazed unit will depend on several factors:

• Size of the unit: Larger glass units will naturally be more expensive.
• Type of glass: Special glass types, such as Low-E glass or laminated glass, will cost more.
• Labour costs: If you hire a professional to replace the unit, labour costs will be added to the price of the glass unit.
• Location: The cost may vary depending on your location, with some areas having higher rates for installation.

Generally, replacing just the sealed unit is a more cost-effective option compared to replacing the entire window frame.

Conclusion

Replacing a sealed double-glazed unit is a practical and cost-effective solution for restoring insulation, clarity, and energy efficiency to your windows without the expense of replacing the entire frame. 

Whether you choose to tackle the job yourself or hire a professional, ensuring accurate measurements, careful handling, and a proper seal will help maintain your window’s performance and longevity.

If your window frame is still in good condition, swapping out just the glass can be a simple way to improve both comfort and appearance while keeping costs down.

Frequently Asked Questions

How Do I Know If My Double Glazed Unit Needs Replacing?

Signs that your sealed unit needs replacing include condensation or fogging between the panes, cracks, or reduced insulation. If you notice draughts or higher energy bills, your double glazing may no longer be effective.

How Long Do Sealed Double Glazed Units Last?

Typically, sealed double glazed units last between 15 to 25 years, depending on the quality of materials and installation. Factors such as weather exposure and maintenance can impact their lifespan.

Can I Replace Double Glazed Units Myself?

While it’s possible to replace a sealed unit yourself, it’s usually best left to professionals to ensure a proper fit and seal. Incorrect installation can lead to poor insulation, condensation, or even damage to the window frame.

Get More Info on this site.