Aluminium Curtain Walling: A Complete Guide to Systems, Components, and Performance

Aluminium curtain walling is a non-load-bearing external façade system that transfers its own weight and environmental loads back to the building structure through anchors, while the primary frame remains separate from the main structural system. I use it to create weather-protective, glazed or opaque building envelopes for offices, hotels, retail buildings, high-rise developments, and public facilities. The right system depends on the building height, wind exposure, thermal targets, glass specification, appearance, installation method, local regulations, and project budget.

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This guide explains the main curtain wall types, components, performance considerations, procurement requirements, and supplier evaluation criteria. It is intended to help architects, façade consultants, contractors, developers, and importers prepare a more complete technical brief before requesting quotations. As a manufacturer and exporter, Jangho can support project-specific system selection, engineering coordination, fabrication, finishing, packaging, and delivery planning.

Who This Guide Is For

I prepared this guide for buyers who need more than a general product description. It is useful when comparing stick-built and unitized systems, reviewing shop drawings, defining performance requirements, or assessing whether a supplier can manage a complete aluminium façade package. It can also help procurement teams identify missing information before fabrication begins.

For a reliable comparison, I recommend involving the architect, façade engineer, main contractor, glazing specialist, and supplier at an early stage. Curtain walling is an integrated product, so a low frame price alone does not show the final project cost or technical suitability. Coordination between structure, waterproofing, fire safety, glass, interior finishes, and mechanical systems is essential.

What Aluminium Curtain Walling Includes

An aluminium curtain wall is generally made from vertical mullions, horizontal transoms, glass or opaque infill panels, pressure plates, cover caps, gaskets, thermal breaks, fasteners, anchors, sealants, drainage paths, and accessories. The aluminium frame supports the infill and transfers wind pressure, suction, dead load, and movement to the building structure. It is not normally designed to carry the floor slabs or other primary structural loads.

Core Functions

• Weather protection: The system manages rainwater through seals, joints, pressure-equalized cavities, and planned drainage routes.
• Environmental control: Glass, insulated panels, thermal breaks, and air seals help control heat transfer, air movement, daylight, and solar gain.
• Structural support: Mullions, transoms, anchors, and brackets transfer calculated façade loads to the building structure.
• Architectural appearance: Cover caps, concealed frames, glass selection, colours, and panel arrangements define the external elevation.
• Movement accommodation: Joints and anchors are designed to accommodate building movement, thermal expansion, and installation tolerances.

Major System Types and Material Options

Stick-Built Curtain Walling

In a stick-built system, mullions and transoms are delivered as separate profiles and assembled on site, followed by glazing or panel installation. This approach can be practical for smaller projects, irregular elevations, phased construction, or sites where transport and lifting access are limited. It usually requires careful site supervision because frame alignment, sealing, drainage, and glass installation are completed progressively.

Unitized Curtain Walling

Unitized curtain walling is assembled into larger factory-produced panels before delivery to the site. The panels are then connected floor by floor using engineered anchors and interlocking joints. This method can improve factory control and reduce the amount of façade assembly at height, but it requires earlier design coordination, accurate site dimensions, suitable transport planning, and lifting equipment.

Typical Materials and Finishes

Aluminium is widely selected because it combines low density, corrosion resistance, formability, and compatibility with architectural finishes. Common finish options include powder coating, anodizing, and other project-specified surface treatments, subject to colour, durability, location, and local requirements. Glass may include insulated, laminated, low-emissivity, solar-control, acoustic, or fire-rated products, but the correct selection must be confirmed through project calculations and applicable regulations.

Key Components and Specifications

Performance should be specified as a complete system rather than by aluminium profile alone. Typical project requirements may include air permeability, watertightness, wind-load resistance, thermal transmittance, acoustic performance, solar control, fire behaviour, and resistance to building movement. For example, a buyer may specify a design wind pressure of 2.0 kPa, an overall thermal target such as 1.6 W/m²·K, or a required acoustic rating, but these values must come from the project engineer and local code rather than from a generic catalogue.

Glass area, mullion spacing, floor-to-floor height, wind zone, building geometry, and support conditions all influence the final design. A taller façade may require deeper profiles, additional reinforcement, or different anchoring from a low-rise elevation. I therefore treat published profile dimensions as preliminary information until structural calculations and project drawings confirm the complete assembly.

Matching the System to the Application

For low- to medium-rise buildings with accessible elevations and a relatively regular grid, stick-built curtain walling may provide a practical balance between flexibility and installation simplicity. For high-rise, repetitive, or fast-track developments, unitized curtain walling may be more suitable when factory assembly, floor-by-floor installation, and logistics justify the additional planning. Neither system is universally better; the correct choice depends on project sequence, site constraints, façade geometry, and required quality control.

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Retail and commercial buildings may prioritize large glazed areas, entrance integration, solar control, and visual consistency. Hotels and residential towers often require attention to acoustic separation, operable windows, balconies, opaque spandrels, and interfaces with interior finishes. Industrial or public projects may place greater emphasis on durability, maintenance access, impact resistance, fire-related interfaces, or cost-controlled panel options.

A Practical Selection Framework

1. Define the Building and Exposure

I first request the building location, height, orientation, elevation drawings, structural grid, floor-to-floor dimensions, and local environmental conditions. Wind exposure, coastal atmosphere, temperature range, rainfall, and seismic considerations can affect profile design, finish selection, anchoring, and joint detailing. If this information is incomplete, the quotation should be clearly identified as budgetary rather than final.

2. Set Performance Requirements

The design team should define the required air, water, structural, thermal, acoustic, solar, and fire-related performance. These requirements should be linked to recognized project standards and local building regulations. A supplier should explain which values are calculated, which are based on prior system data, and which require project-specific testing or engineering review.

3. Confirm Appearance and Interfaces

Buyers should approve the visible cap design, frame sightlines, colour, glass reflection, spandrel treatment, opening types, corners, parapets, and transitions to doors or stone panels. I also recommend reviewing how the curtain wall meets slabs, roofs, columns, expansion joints, and interior partitions. Many avoidable changes occur when aesthetic decisions are made without checking fabrication and installation interfaces.

4. Review Fabrication and Installation

Ask for system drawings, section details, material schedules, sample finishes, packing methods, quality checkpoints, and an installation sequence. Confirm who is responsible for site measurement, embedded items, sealants, testing, damage inspection, and replacement parts. A complete responsibility matrix reduces the risk of gaps between the façade supplier, glazing contractor, and main contractor.

Pricing, MOQ, and Lead-Time Considerations

Curtain wall pricing is normally affected by the total façade area, system type, aluminium consumption, glass specification, finish, opening percentage, engineering complexity, hardware, packaging, shipping terms, and installation scope. A quotation based only on square metres may exclude anchors, corner conditions, fire-stop interfaces, special glass, mock-ups, or site services. I recommend requesting a line-item quotation with clear exclusions and assumptions.

Minimum order quantities vary according to profile extrusion, finishing batches, glass procurement, and production planning. Project-specific extrusion and colour matching may require a larger commitment than standard profiles and finishes. Lead time should be separated into design approval, material procurement, extrusion, finishing, glass production, assembly, inspection, packing, and transport, rather than presented as one unexplained number.

Supplier Evaluation Checklist

• Can the supplier provide system drawings, shop drawings, calculations, and coordinated interface details?
• Are aluminium alloy, finish specification, glass make-up, gasket material, sealant compatibility, and hardware clearly identified?
• Can the supplier explain its quality-control process for dimensions, colour, assembly, glazing, drainage, and packaging?
• Does the supplier have an export process covering crating, container loading, shipping documents, and replacement components?
• Are testing responsibilities, site support, warranties, maintenance information, and defect procedures defined in writing?
• Can the supplier adapt the solution to local code, project geometry, installation resources, and required performance?

At Jangho, I approach aluminium curtain walling as a coordinated building-envelope package rather than a collection of profiles. Our support can cover product selection, technical communication, façade detailing, customization, manufacturing coordination, surface-finishing requirements, quality inspection, export packaging, and delivery planning. The final scope depends on the project drawings, specifications, destination, and contract responsibilities.

Key Takeaways

• Aluminium curtain walling is a non-load-bearing façade system that transfers environmental and self-weight loads to the structure.
• Stick-built systems suit many flexible or smaller installations, while unitized systems can support repetitive and fast-track high-rise construction when logistics are suitable.
• Performance depends on the complete assembly, including profiles, glass, thermal breaks, seals, anchors, drainage, and interfaces.
• Buyers should define wind, thermal, air, water, acoustic, solar, movement, and fire-related requirements before requesting a final quotation.
• Supplier capability should be assessed through engineering support, customization, quality control, packaging, documentation, and after-sales responsibilities.

Conclusion: How to Proceed with Your Project

The best aluminium curtain walling system is the one that matches the building’s performance requirements, façade geometry, installation method, programme, and procurement strategy. I recommend starting with elevation drawings, structural information, target specifications, glass requirements, finish preferences, estimated quantities, and delivery location. This allows the supplier to distinguish between a budget concept and a technically coordinated proposal.

If you are sourcing an aluminium curtain walling package, Jangho can review your project information and help identify a suitable system, component configuration, customization route, and supply scope. Send your drawings, specifications, quantity schedule, and required delivery date for an initial technical and commercial discussion. A clear project brief at the beginning is the most practical way to reduce revisions, compare suppliers fairly, and move toward reliable façade procurement.

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