Glass Fins and Metal Connectors for Curtain Wall Bracing

t496-37

Glass fins are vertical glass plates bonded or mechanically fixed to the glazing to stiffen a curtain wall against wind and out-of-plane loads. Metal connectors transfer those loads from the fin to the primary structure, so their geometry, material and fixing points must be designed together with the glass.

When glass fins are the right bracing solution

Glass fins are useful when the facade needs a clean, transparent look and the mullions would otherwise interrupt the view. They work well on tall glazed walls, atriums and lobbies where wind pressure governs the design. Fins allow larger glass panels to span between points of support while keeping the wall visually open.

Before committing to fins, confirm the wind load case, the deflection limit for the glazing and whether the fins can be reached for maintenance. A fin that is hard to inspect or clean is often a poor trade for the visual gain.

Choosing the fin glass and its build-up

Fins are typically laminated, heat-strengthened or fully tempered glass, selected for the load and the failure behaviour you want. Laminated glass is preferred where residual strength after breakage matters, because the interlayer holds the fragments in place.

Confirm the fin thickness against the calculated bending and buckling demand.
Specify edge finish and any drilling or cut-outs before tempering.
Coordinate the glass supplier's requirements with the metal connector drawings.

Metal connectors and how loads travel

The metal connector carries the load from the fin into the primary frame or slab. A typical connector is a stainless steel or aluminum shoe, bolted through the fin or bonded to it, with a fixing point to the structure. The detail should show a clear load path so the connector does not rely on the glass edge alone.

Design the connector so that it accommodates tolerances in the building structure and allows for thermal movement of the glass and frame. Slotted holes and sliding bearings are common solutions where movement must be absorbed.

Connection details that need careful coordination

Most problems appear at the junction between the fin, the glazing and the connector. The contact surfaces should be protected with suitable gaskets or setting blocks so that glass is never loaded directly against metal. Bolt holes in glass need generous clearance and should be located away from high stress zones.

Points to check on the drawings

Bearing and edge clearance around every fixing hole.
Isolation material between metal and glass.
Corrosion compatibility between stainless steel, aluminum and any galvanized steel.

Fabrication, finishing and site installation

Connectors are usually cut, drilled and formed in the workshop to match the fin drawings, then finished for the environment. Stainless steel suits coastal and high-exposure sites, while galvanized and powder-coated steel are common on structural elements. Surfaces in contact with glass should be smooth and free of burrs.

On site, the fins should be installed in the sequence shown on the shop drawings, with alignment checked before final tightening. Tolerances in the primary structure are the usual source of delay, so measuring the actual structure before fabrication is recommended.

Coordinating with the structural engineer

The fin, connector and primary structure form one system and should be checked together. The structural engineer confirms the loads, deflections and fixing capacities, while the glass consultant verifies the fin stresses and failure modes. Exact design values and code checks, including requirements under the Israeli railing standard SI 1142 where relevant, should be confirmed with the engineer for each project.

Send your facade elevations, wind load information and structural drawings early so the connector design can be developed alongside the glass layout.

Frequently asked questions

What is the main function of a glass fin in a curtain wall?

A glass fin acts as a vertical stiffener that resists wind pressure and out-of-plane loads on the glazing. It lets the glass span between supports without visible mullions.

Why are metal connectors needed for glass fins?

Connectors transfer loads from the fin into the building structure and accommodate tolerances and thermal movement. They keep the glass from carrying loads directly at its edges.

Which metals are commonly used for these connectors?

Stainless steel and aluminum are common for visible or exposed connectors, while galvanized or coated steel is often used for structural parts. Material choice should consider corrosion compatibility and the site environment.

Who should approve the fin and connector design?

The structural engineer should approve the loads and fixing capacities, and the glass consultant should verify the fin design. Exact code values should be confirmed with the engineer for each project.

Common mistakes to avoid

Designing the fin and the connector separately, or allowing metal to bear directly on the glass without isolation, are the most common causes of failure. Ignoring tolerances in the primary structure often leads to costly site adjustments.

Our recommendation

Coordinate the fin, connector and structure in one shared set of drawings from the start, and measure the actual structure before fabrication. Send the connector drawings to the engineer for review before ordering the glass.

Summary

Glass fins with well-designed metal connectors provide an open, transparent curtain wall that resists wind loads effectively. Clear load paths, proper isolation and early coordination with the engineer make the system reliable.

השאירו פרטים ונחזור אליכם