Glass Railing Technical Specifications: VSG, ESG, Wind Load & Standards
Choosing the right glass for railing projects: VSG laminated vs ESG tempered safety glass. Wind load calculation per EN 1991-1-4, load classes from 1.5 to 7.0 kPa, and mounting systems per EN 12150.
VSG vs ESG: Key Differences
ESG (Einscheiben-Sicherheitsglas / single-pane tempered) shatters into small harmless fragments on impact. VSG (Verbund-Sicherheitsglas / laminated safety glass) holds together when broken, as the PVB interlayer keeps fragments bonded. For glass railings, VSG is mandatory — if a panel breaks, it must remain in place as a barrier until replaced.
Glass Thickness Selection
Glass thickness depends on wind load, railing height and support span. EN 16612 provides the calculation methodology. Typical specifications: 2×6 mm VSG for residential low-rise, 2×8 mm for mid-rise, 2×10 mm for commercial, 2×12 mm or 2×15 mm for high-wind/high-rise applications. The PVB interlayer is typically 0.76 mm or 1.52 mm.
Heat Soak Testing
Tempered glass can spontaneously break due to nickel sulfide (NiS) inclusions. Heat Soak Testing (HST per EN 14179-1) subjects panels to 290°C for 4 hours, causing NiS-affected panels to fail in the factory rather than on site. HST is recommended for all glass railing applications and mandatory for safety-critical installations.
Specification Writing
A complete glass railing tender specification should include: glass type (VSG-ESG), thickness per ply, interlayer type and thickness, edge treatment (polished, ground, chamfered), surface treatment (clear, tinted, printed, frosted), heat soak requirement, maximum panel dimensions, load requirements per EN 1991-1-1 and relevant DIN standards.
