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Vacuum Glazing Units

Vacuum Insulated Glass Units

8.4 mm vacuum-sealed glazing with a U-value of 0.5 W/m²K — outperforms triple glazing in less than a third of the thickness. Ideal for high-performance modern builds, deep retrofits, and any project where thermal performance matters and frame depth is limited.

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Trent Glass Vacuum Insulated Glass Units consist of two glass plies separated by a sub-millimetre vacuum cavity with a precision array of micro-pillar spacers. The vacuum eliminates conduction and convection through the cavity entirely — the only remaining heat path is radiation, which is suppressed by a low-emissivity coating. The result is a glazing unit that performs better than triple glazing in 8.4 mm of total thickness.

Key Features

  • U-value: 0.5 W/m²K — outperforms triple glazing
  • Total thickness: just 8.4 mm (fits in single-glazing rebates)
  • Weight: 50–60% lighter than equivalent triple glazing units
  • Pillar array: hexagonal-pitch micropillars between the two plies, all but invisible at viewing distance
  • Edge seal: laser-welded glass-to-glass hermetic seal — guaranteed 25+ year vacuum life
  • Compatible with toughened, laminated, low-iron or coloured glass plies

Ideal Applications

  • Passivhaus and EnerPHit-grade new builds
  • Deep retrofit projects targeting EPC A or B
  • Heritage and conservation refits where single-glazing rebates limit replacement thickness
  • Listed buildings (in conjunction with the Slim Profile variant)
  • High-rise residential — weight saving reduces structural and lifting cost
  • Architectural feature glazing where slim sightlines matter
  • Cold-climate exports (Scandinavia, Scotland, alpine regions)
  • Spaces where condensation control is critical (museums, archives, galleries)

Technical Specifications

  • Glass build-up: 4 mm + 0.4 mm vacuum + 4 mm (total 8.4 mm)
  • U-value: 0.5 W/m²K (centre-pane); 0.7–0.9 W/m²K whole-unit depending on frame and edge spacer
  • Light transmission: ~70% (low-iron variant up to 80%)
  • Solar factor (g): ~0.50 (configurable with coating)
  • Maximum unit size: 1500 × 2500 mm; larger by structural assessment
  • Acoustic insulation: Rw up to 38 dB (laminated outer ply)
  • Compliance: BS EN 1279 sealed insulating glass; BS EN 12150 if toughened; CE / UKCA marked
  • Warranty: 15-year vacuum performance guarantee
  • Lead time: 6–8 weeks from sign-off