Vertical Transport & EnvelopesCWCT Standard for Systemised Building Envelopes

Curtain Walling & Commercial Facades

Engineered building envelopes integrating stick, unitised, or structural silicone glazing for multi-storey commercial developments.

Specifier Problem & Project Context: Commercial developers, architects, and principal contractors need to resolve extreme wind loads, solar heat gain coefficients, airtightness, and Approved Document B external fire spread requirements.

Architectural installation example of Curtain Walling & Commercial Facades

Architectural Installation Context — Curtain Walling & Commercial Facades

Architectural System Section

Curtain Walling & Commercial Facades

Structural Perimeter Section & Fixing Detail

Section 01150mm

Structural Soffit / Deflection Head

Absorbs ±15mm floor slab live deflection

Section 0245mm

Top Acoustic Glazing Channel

Acoustic EPDM acoustic gasket seals

Section 0312.8mm

Acoustic / Safety Glazing Pane

Central sound isolation & impact barrier

Section 0465mm

Structural Base Shoe Channel

Continuous mechanical floor fixing to BS 6180

Section 05200mm

Structural Floor Slab & Screed

Primary dead-load and moment anchor point

Evaluation

Candidate Glass Constructions & Practical Trade-Offs

Option 0128mm – 44mm Double or Triple IGUs

Thermally Broken Stick Curtain Walling (Pressure Plate / Capped)

Recommended When:Low-to-medium rise commercial office buildings (1 to 5 storeys) and school atriums.

Trade-Offs & Limits:Highly adaptable on site; lower upfront tooling cost; requires on-site scaffolding and weather-dependent external glazing installation.

Option 0232mm – 48mm High-Performance Triple IGUs

Unitised Curtain Walling (Factory-Assembled Cassettes)

Recommended When:High-rise urban office towers and fast-track city centre developments.

Trade-Offs & Limits:Factory-controlled quality and rapid crane-assisted installation without scaffolding; requires substantial upfront design lead time and higher transport costs.

Option 0332mm – 40mm Stepped Double IGUs with UV-Resistant Silicone Secondary Seal

Structural Silicone Glazing (SSG / Frameless Exterior)

Recommended When:Monolithic flush-glass architectural facades with concealed mullions.

Trade-Offs & Limits:Stunning seamless glass aesthetic; requires certified two-part structural silicone (ETAG 002 compliant) and strict quality-control adhesion testing.

Architectural Design Checklist

Calculate site-specific wind pressure to BS EN 1991-1-4 (Eurocode 1) factoring in building height, terrain category, and corner vortex amplification.

Determine solar factor (g-value) per elevation: South and West elevations typically require g ≤ 0.30; North elevations benefit from higher daylight transmittance.

Detail horizontal and vertical fire stopping at each floor slab edge compliant with CWCT standard and Approved Document B.

Incorporate drainage weep holes and pressure equalisation chambers to prevent water ingress under 600 Pa test pressures.

Statutory UK Building Regulations

CWCT Standard for Systemised Building Envelopes

Mandatory dynamic water penetration, wind resistance (serviceability and safety), and impact testing.

Building Safety Act 2022 & Approved Document B

Stringent non-combustibility rules for external wall assemblies on buildings over 18m (or 11m in Scotland).

BS EN 1279 Parts 2 & 3

Hermetic seal integrity and argon gas retention verification for commercial envelope units.

Installation & Site Access Logistics

Crane & Vacuum Lifters:Mandatory for high-level, thick multi-ply, or oversized panels.

Substrate Fixings:Dead-load and wind-load brackets must be anchored to structural concrete slabs using cast-in channels or engineered chemical anchors with verified pull-out values.

Site Tolerances:Concrete slab edge tolerances (±25mm) must be absorbed within adjustable facade bracket 3-axis slot design.

Procurement Advice: Supply-Only vs Turnkey

Curtain wall projects require a tier-1 or tier-2 specialist facade contractor with full PI (professional indemnity) design insurance, structural engineering calculations, and thermal modelling capabilities.

Reviewed by: Chartered Facade Structural Engineer (MSc CEng CWCT), BuyGlass Editorial Panel

Updated: 2026-10-30

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Curtain Walling & Commercial Facades

Curtain Walling & Commercial Facades

Candidate Glass Constructions & Practical Trade-Offs

Thermally Broken Stick Curtain Walling (Pressure Plate / Capped)

Unitised Curtain Walling (Factory-Assembled Cassettes)

Structural Silicone Glazing (SSG / Frameless Exterior)

Architectural Design Checklist

Statutory UK Building Regulations

Installation & Site Access Logistics

Procurement Advice: Supply-Only vs Turnkey

Specify Curtain Walling & Commercial Facades in Your Local Area

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