What Structural Glazing Is

Structural glazing is a curtain wall in which the glass is bonded to the frame with structural silicone rather than held in place by visible pressure caps. From outside, the façade reads as an almost frameless sheet of glass — the aluminium that carries it sits behind the glass line, out of sight. It is the system specifiers reach for when they want a flush, high-end glass face on a prime corporate building, hotel or bank.

Facade Ghana engineers and installs structural-glazed façades across Ghana, to AAMA structural-silicone guidance, since 1982. This guide explains how the system works and how its quality is assured.

How a Bonded Glass Façade Works

In a conventional (capped) curtain wall, pressure plates and caps clamp the glass to the frame, and you see those caps as lines across the façade. In structural glazing, that mechanical capping is replaced — wholly or partly — by a structural silicone bond between the glass and the aluminium carrier frame.

Four-Sided vs Two-Sided

Four-sided structural glazing bonds the glass on all four edges, giving the fully flush, frameless face with no visible aluminium at all.
Two-sided structural glazing bonds two opposing edges and mechanically caps the other two, giving strong vertical or horizontal sightlines while still reading cleaner than a fully capped wall.

Minimal Sightlines

Because the glass is bonded rather than clamped, the visible joint between panes can be reduced to a slim silicone weather-seal line. The result is the deep, continuous glass appearance — minimal sightlines, maximum glass — that distinguishes a structural-glazed tower from a capped one. It can be built as a stick or a unitised system.

The Silicone Bond Carries Load — So QA Is Everything

In a structural-glazed façade the silicone is not just a weather seal; the structural silicone carries the wind load from the glass back into the frame. That makes the quality of the bond a safety matter, not a finish matter. Facade Ghana follows the discipline that keeps a bonded glass wall sound over its life.

Quality Assurance on the Bond

AAMA structural-silicone guidance governs the joint design, bite (bond width) and glueline thickness, sized to the glass area and wind load.
Substrate preparation — the aluminium and glass surfaces are cleaned and primed to the silicone manufacturer’s specification before bonding; a contaminated surface is the most common cause of a failed bond.
Factory bonding where possible — bonding under controlled factory conditions (as on a unitised panel) gives more reliable adhesion than site bonding, which is sensitive to dust, humidity and temperature.
Adhesion and cure testing — sample bonds are checked for full cure and adhesion before panels are accepted, so a weak batch is caught before it reaches the building.

Performance — Tested, Not Assumed

A structural-glazed façade is verified against the same performance standards as any other curtain wall: air leakage to ASTM E283, water penetration to ASTM E331, structural wind load to ASTM E330, and field water and inter-storey-drift testing to the AAMA 501 family, with fabrication to EN 1090 execution discipline. See Façade Performance Testing. We specify and test the wall — we do not claim a class it has not been tested to.

Where Structural Glazing Fits in Ghana

Corporate HQs and banks specifying a flush, frameless façade
Prime commercial towers in Airport City, Ridge and the Accra CBD
Hotels wanting an uninterrupted glass face
Buildings where the architectural intent is “all glass, no frame”

It is a premium look at a premium price — a structural-glazed façade costs more than a capped curtain wall. The value is the appearance and the engineering behind it, not waste.

Frequently Asked Questions

Is structural glazing safe if the glass is only held by silicone? Yes, when it is engineered and quality-assured properly. Structural silicone is a load-carrying material with a long track record in façades, and the bond is sized to the glass area and wind load to AAMA guidance. The risk is not the principle but a poorly prepared or poorly cured bond — which is exactly what the QA discipline (substrate preparation, factory bonding, adhesion and cure testing) exists to prevent.

What is the difference between structural glazing and a normal curtain wall? In a normal (capped) curtain wall the glass is held by visible pressure caps that read as lines on the façade. In structural glazing the glass is bonded to the frame with structural silicone, so the façade reads as an almost frameless sheet of glass. Structural glazing gives a flush premium face at a higher price; a capped wall is simpler, easier to re-glaze and lower-priced.

Can structural glazing be built as a unitised system? Yes. Structural glazing describes how the glass is fixed (bonded, not capped); stick and unitised describe how the wall is built. The two combine — a unitised structural-glazed panel is bonded in the factory under controlled conditions, which is the most reliable way to achieve the bond.

Talk to the Façade Team

A frameless glass façade lives or dies on the engineering and QA behind the bond. Facade Ghana provides a free survey, specifies the structural-glazed system to your building, and tests it against the real standards. Call +233 27 000 0844 to book your survey.