VIG
High-performance façades demand nuance. With vacuum insulating glass (VIG), designers can achieve superb thermal performance and visual clarity in slimmer envelopes—but success depends on sound engineering choices from concept to shop drawings.
Thermal physics in a nutshell
VIG suppresses conduction and convection by replacing the gas cavity with a vacuum. Radiative transfer is minimized using low-e coatings. The result is low U-values in a thin build—ideal for curtain walls seeking high performance without deep mullions.
Core design choices that matter
- Frame and anchors: Choose thermally broken systems with low psi-values at transoms and mullions. Coordinate gaskets and pressure plates to avoid cold bridges.
- Coatings and optics: Balance SHGC and VT to the climate and program. Spectrally selective coatings can preserve daylight while limiting heat gain.
- Structural loads: Confirm wind loads, glass thicknesses, and allowable deflections. VIG’s micro-spacer matrix and edge seals require uniform support and controlled bead compression.
For a concise designer-friendly checklist—edge distances, pillar patterns, and compatible sealants—see factors to design with VIG:
Curtain wall integration
Whether unitized or stick-built, ensure consistent rebate geometry, drainage/ventilation paths, and setting block placement. Pressure equalization and rain screen strategies remain relevant. For façade planners evaluating assembly options, applying vacuum glass in curtain wall provides practical guidance on module sizing, sightlines, and performance trade-offs:
Visual flatness, zero ripples
Architects and clients are sensitive to wavy reflections and “oil-canning.” Because VIG’s vacuum cavity avoids gas expansion/contraction issues, it helps maintain planar reflections across temperature and altitude changes. Detailing frames correctly maintains that benefit. Dive deeper into optical quality considerations in vacuum glass helps your facade free of visual distortion:
Workflow tips
- Model whole-window performance early, not just center-of-glass.
- Coordinate tolerances among fabricator, glazier, and frame manufacturer.
- Mock up critical corners and sun-exposed bays to validate thermal and optical behavior.
Conclusion
With smart detailing, VIG enables sleek, high-performing curtain walls and façades—combining thermal excellence with crisp, mirror-like reflections and refined profiles.
