Curtain Wall Systems – Technical Detail Development (Engineering Guide + PDF)
Curtain wall systems are among the most critical components of modern architectural façades. Their performance depends on the correct design of profile sections, glass positioning, anchorage, drainage routes and thermal insulation layers. This guide explains how a complete curtain wall technical detail is created step by step, based on engineering principles and façade performance requirements.
1. System Definition and Application Areas
This technical package focuses on stick-built curtain wall systems, commonly used in:
- High-rise commercial buildings,
- Mixed-use developments and shopping malls,
- Modern transparent façade applications,
- Projects requiring modular façade grids and engineered layouts.
Curtain wall systems consist of vertical mullions and horizontal transoms carrying both wind loads and panel weights. Every detail must be designed considering structural, thermal and acoustic performance.
2. Profile Sections and Component List
The entire detail is illustrated with a numbered legend. Core components include:
- Mullion (Vertical Member): Transfers wind loads to the main structure.
- Transom (Horizontal Member): Carries glass loads and provides structural continuity.
- Glass Retainers: Secure the insulated glass units in position.
- EPDM Outer Gasket: Ensures airtight and watertight performance.
- Thermal Barrier: Minimises thermal bridging between inner–outer aluminium profiles.
- Façade Anchors: Provide structural connection between the curtain wall and the building.
- Drainage Channels: Allow condensation and rainwater to be discharged safely.
3. Structural Behaviour and Wind Load Effects
Curtain walls operate under constant wind action. Therefore, the following parameters must be evaluated during detail development:
- Mullion moment of inertia (Ix – Iy),
- Transom support condition and plate connections,
- Load transfer from glass to mullion/transom,
- Thermal expansion and expansion joints.
An incorrect profile selection or an improper connection detail can result in glass breakage, façade deformation or air leakage. This guide highlights correct engineering practices for façade safety.
4. Glazing, Insulation and Weather-Tightness
Weather performance in curtain wall systems depends on the correct configuration of:
- EPDM outer and inner gaskets,
- Continuous gasket lines with no interruption,
- Glass support blocks positioned at correct bearing points,
- Horizontal drainage paths at transom levels,
- Pressure plates or caps depending on system type.
The detail also demonstrates how moisture is controlled through multi-layered sealing systems.
5. Anchorage and Building Interface
Anchorage is one of the most critical steps in curtain wall engineering. This section illustrates:
- Adjustable façade anchor plates,
- Mullion mounting channels,
- Fire barrier placement between floors,
- Horizontal movement joints at slab edges.
Correct anchorage ensures long-term façade stability, wind resistance and seismic safety.
📥 Downloadable PDF
🔗 Useful Tools
- Aluminum Composite Panel Cutting Optimization
- Aluminum Sheet Cutting Optimization
- Capped Curtain Wall Take-Off Calculator
- Ceramic Façade Quantity & Cost Calculator
- Double-Leaf Door Take-Off Calculator
- Double-Leaf Outward Opening Door Calculator
- Façade Calculator Hub
- Feet–Inch ⇄ Metric Converter
- Fixed + Operable Sash Window Calculator
- Technical Façade Details
- 60 mm Single-Sash Window Detail
Who Is This Guide For?
- Façade engineers and consultants,
- Architectural design offices,
- Fabrication and installation teams,
- Aluminium system manufacturers,
- Architecture and engineering students.
Conclusion
This engineering guide provides a complete reference for developing a high-performance curtain wall detail. At Arkistral Façade Consulting & Engineering, we utilise similar technical details across our design, consultancy and training processes to ensure façade quality from concept to installation.