Sealed Unit Double Glazing

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Sealed Unit Double Glazing Guide:

 

Sealed unit double glazing is a popular and efficient window solution for modern homes and buildings. Here’s an overview of sealed double glazed units:

Structure and Composition

Sealed double glazed units consist of two panes of glass separated by a spacer bar, typically ranging from 20mm to 28mm in thickness. The space between the panes is filled with an inert gas, usually argon, which enhances thermal insulation4. The entire unit is sealed around the edges to create an airtight barrier.

Manufacturing Process

The production of sealed units involves several steps:

  1. Glass cutting and washing
  2. Application of a superspacer to connect the panes
  3. Filling the cavity with argon gas
  4. Sealing the edges with hot melt butyl sealant4

Benefits

Improved Insulation: Double glazed units offer superior thermal and acoustic insulation compared to single glazing. This helps maintain a comfortable indoor temperature and reduces energy costs.

Energy Efficiency: The trapped gas between the panes creates an insulating barrier that keeps heat in and cold out. This improves the overall energy efficiency of buildings.

Noise Reduction: The double-pane structure helps reduce external noise, creating a quieter indoor environment.

Condensation Prevention: Properly sealed units reduce the likelihood of condensation forming between the panes.

Maintenance and Replacement

Over time, the seal in double glazed units can fail, leading to issues like misting between the panes. This is often referred to as “blown” double glazing. When this occurs, replacement of the sealed unit is typically recommended to restore energy efficiency and aesthetics. Importantly, in many cases, only the glass unit needs to be replaced, not the entire window frame.

Customization Options

Sealed double glazed units can be customised to suit various needs:

  • Different glass thicknesses (3mm, 4mm, 6mm, etc.)
  • Low-E coatings for enhanced thermal performance
  • Toughened glass for increased safety and strength
  • Various shapes including rectangles, triangles, and arches
  • Optional extras like Georgian bars or lead designs

Ordering and Installation

Many suppliers offer online ordering systems for custom-made double glazed units. This allows homeowners and professionals to easily order replacement units to exact specifications. Installation can be done by professionals or, in some cases, by experienced DIY enthusiasts.

In conclusion, sealed unit double glazing provides an effective solution for improving home insulation, reducing energy costs, and enhancing comfort. With proper maintenance and timely replacement when needed, these units can significantly contribute to a more energy-efficient and comfortable living space.

 

Styles and costs of sealed unit double glazing:

Common Styles

  • Casement windows: The most popular and affordable style, with hinged sashes that open outwards. Average cost £300-£400 per window.
  • Sash windows: Vertical sliding sashes, more expensive at £600-£800 per window on average.
  • Tilt and turn windows: Can open inwards or tilt for ventilation. Average cost £500-£600 per window.
  • Bay windows: Projecting outwards, typically more expensive due to size and complexity.

Cost Factors

  • Frame material: uPVC is cheapest, aluminium and wood more expensive.
  • Glass type: Standard double glazing vs. specialised options like low-E or self-cleaning glass.
  • Window size: Larger windows cost more.
  • Number of windows: Buying in bulk can reduce per-unit costs.
  • Energy efficiency rating: Higher rated units cost more but offer better insulation.

Average Costs

  • Single standard uPVC casement window: £450-£1,200
  • Double glazing a 3-bed house: £2,320-£5,800 for 4-6 windows
  • Small double glazed unit replacement: £70-£150
  • Large double glazed unit replacement: £300-£400

The most affordable option is typically uPVC casement windows. For maximum energy efficiency, consider units with argon gas filling and low-E glass, though these will increase costs. Getting multiple quotes from installers is recommended to find the best price.

 

 

 

sealed unit double glazing

 

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