Spider Glazing System: Complete Guide for Indian Buildings

What Makes Spider Glazing Different

In conventional structural glazing, glass is bonded to an aluminium frame with silicone. Spider glazing uses stainless steel point fittings — 'spiders' — bolted directly through the glass at 4 points per panel. The glass appears to float in space with minimal visible support. The visual result is dramatic: a wall of glass with no frame, no silicone lines. The engineering is substantially more complex than frame systems.

Spider Fitting Types and Their Applications

Glass Specification for Spider Glazing

Glass in spider glazing is more highly stressed than in frame systems — the entire panel load concentrates at 4 bolt holes:

• 1.Minimum glass thickness: 10mm toughened. Most applications use 12mm or 15mm.
• 2.Laminated glass is mandatory for all overhead applications.
• 3.Heat-soaking (IS 14900) is non-optional — nickel sulphide inclusions cause spontaneous breakage in public areas.
• 4.Hole diameter: typically 50-60mm, located minimum 100mm from glass edge.
• 5.Maximum panel size is constrained by both wind load deflection and logistics — panels above 2m × 3m become difficult to handle without breakage.

Structural Support Systems

Spider glazing needs a primary structure to carry loads back to the building:

• 1.Steel Truss: for large spans (above 5m). Used in airport terminals and landmark lobbies.
• 2.Glass Fin System: vertical fins of structural glass (typically 19mm laminated) carry horizontal wind loads. Premium retail and corporate lobbies.
• 3.Stainless Steel Cables: tensioned cable net systems allow curved or inclined glass walls.
• 4.Steel Rod System: tension rods for standard spans up to 4-5m between floors.

Spider Glazing Costs in India 2026

When Spider Glazing is Worth the Premium

Spider glazing costs 2-3x conventional structural glazing. It's worth specifying when:

• 1.The lobby or atrium is a brand statement — corporate HQ, 5-star hotels, airport terminals.
• 2.Unobstructed views are critical — showrooms, restaurants with panoramic views.
• 3.Large, seamless glass walls that no frame system can achieve.

Maintenance Considerations

Spider glazing is more maintenance-intensive than frame systems:

• 1.Every fitting must be checked for corrosion and torque annually.
• 2.Neoprene gaskets between fitting and glass must be replaced at 5-7 year intervals.
• 3.Silicone weather sealant at panel joints requires re-caulking every 8-10 years.
• 4.Any glass breakage requires removing entire panels — more disruptive than frame system repair.