Vacuum Insulated Glass 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.
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