Curtain Wall System Types: A Practical Guide for Selecting the Right Façade

The main curtain wall system types are stick-built, unitized, and semi-unitized systems. Structural glazing and point-supported glazing are related façade configurations, but they describe how glass is retained or expressed rather than replacing the basic system classification. I recommend choosing among these options by considering building height, installation access, project repetition, schedule, weather performance, thermal requirements, and the level of factory assembly needed.

If you are looking for more details, kindly visit our website.

As a manufacturer and supplier, I help project teams compare the technical and commercial implications of each system before they finalize specifications. The best solution is not always the most advanced or the lowest initial price; it is the system that can be designed, manufactured, transported, installed, tested, and maintained reliably for the specific project.

What Is a Curtain Wall System?

A curtain wall is a non-load-bearing exterior wall assembly attached to a building’s structural frame. It generally includes vertical mullions, horizontal transoms, glass or opaque infill panels, pressure plates or structural silicone, gaskets, anchors, flashings, insulation components, and drainage paths. The system transfers its own weight and environmental loads to the structure, while the primary building frame carries the main gravity loads.

Curtain walls are used in offices, hotels, hospitals, airports, commercial buildings, mixed-use developments, and high-rise projects. They provide weather separation, daylight, views, thermal control, and an architectural exterior expression. Their performance depends on the complete assembly, including interfaces with slabs, columns, roofs, windows, doors, fire-stopping, and adjacent wall systems.

Main Curtain Wall System Types

1. Stick-Built Curtain Wall

A stick-built curtain wall is assembled mainly on site from separate vertical mullions, horizontal transoms, glazing components, and infill panels. The contractor typically installs the framing first and then fits the glass or opaque elements progressively from floor to floor. This approach provides flexibility when dimensions vary or when the façade has many local conditions.

Stick systems can be practical for low- and mid-rise buildings, smaller façades, renovations, and projects where transportation or lifting access is limited. They may also support late design coordination because individual components can be adjusted during installation, subject to approved engineering and tolerances. However, more site assembly means that installation quality, weather protection, storage, access, and sequencing require close management.

2. Unitized Curtain Wall

A unitized curtain wall is manufactured as large prefabricated panels, commonly incorporating mullions, transoms, glazing, insulation, spandrel elements, gaskets, and hardware before delivery to the site. The panels are then transported, lifted, and connected to anchors installed at the building structure. A common unit height is approximately 3–4 m, but the final module size must be determined by floor-to-floor height, glass dimensions, transport limits, lifting capacity, and structural design.

Unitized systems are often considered for high-rise or repetitive buildings because factory assembly can reduce the amount of glazing and sealing work performed at elevation. They require disciplined early coordination, accurate structural surveys, dedicated logistics, and careful protection during transportation. If the building geometry changes significantly from floor to floor, a fully unitized approach may require many special panels and lose some of its production efficiency.

3. Semi-Unitized Curtain Wall

A semi-unitized curtain wall combines features of stick-built and unitized construction. Certain components, such as glazed panels or cassette assemblies, are prefabricated, while mullions, transoms, or perimeter connections are assembled on site. This arrangement can provide a balance between factory quality control and field flexibility.

Semi-unitized systems can be useful when the project has repeated façade zones but also includes podiums, corners, setbacks, or irregular interfaces. The exact division between factory and site work varies by supplier and design. I recommend defining the assembly boundary clearly in the contract documents so that responsibilities for tolerances, sealing, testing, protection, and corrective work are not left ambiguous.

4. Structural Glazing Curtain Wall

Structural glazing is an appearance and retention strategy in which glass is bonded or mechanically supported so that external face caps may be reduced or eliminated on selected elevations. It can create a smooth glass appearance, but it requires compatible glass, framing, silicone, gaskets, drainage, and carefully controlled fabrication procedures. The design must also address replacement, edge conditions, movement, and long-term maintenance.

Structural glazing may be integrated with either stick-built or unitized construction. It should therefore be specified as part of the complete façade system rather than treated as an isolated visual feature. Project-specific engineering and approved material compatibility information are essential before production.

5. Point-Supported and Cable-Supported Glazing

Point-supported glazing uses fittings, fins, trusses, cables, or other structural components to support glass with a more transparent appearance. It is frequently considered for entrances, atriums, lobbies, skylights, and feature façades rather than as the default solution for every building elevation.

If you are looking for more details, kindly visit Jangho.

These systems can demand more detailed structural analysis and coordination than conventional framed curtain walls. The design must consider glass type, connection forces, movement, condensation control, access, cleaning, and replacement procedures. For this reason, I treat point-supported glazing as a specialized façade option that should be evaluated against the project’s architectural and engineering objectives.

Key Specifications to Compare

System type is only one part of curtain wall selection. The project team should establish design loads, allowable movement, glass configuration, thermal targets, acoustic requirements, fire interfaces, drainage strategy, finish, and maintenance access. For example, a project may use a target thermal transmittance of 1.6 W/m²K for a defined portion of the façade, but the applicable requirement depends on the local code, climate, glass ratio, frame, spandrel, and calculation method.

Water and air performance should be specified through project requirements and tested according to the applicable standards. A pressure value such as 300 Pa may appear in a project test specification, but it should never be assumed to apply universally. I recommend confirming the required performance class, test sequence, specimen size, joints, interfaces, and acceptance criteria before manufacturing begins.

How I Match the System to the Project

Step 1: Review the Building and Façade Geometry

I first review building height, floor-to-floor dimensions, elevation repetition, corners, setbacks, slab edges, and access conditions. A repetitive high-rise façade may support unitized production, while a smaller building with many unique openings may be more suitable for stick or semi-unitized construction. The decision should reflect actual geometry rather than a generic preference.

Step 2: Confirm Performance and Interfaces

Next, I coordinate structural movement, wind loading, glass selection, thermal targets, acoustic needs, drainage, fire-stopping, and adjacent construction. Curtain wall performance can be compromised at interfaces even when the central panel is correctly designed. For that reason, details at slabs, parapets, corners, windows, doors, and transitions should be reviewed early.

Step 3: Evaluate Manufacturing and Installation

The supplier should confirm available extrusion, glass, panel, coating, sealant, and hardware capabilities. The team should also evaluate shipping dimensions, storage space, lifting equipment, installation sequence, replacement access, and site tolerances. A factory-built panel is valuable only when the project can receive and install it safely and accurately.

Step 4: Compare Total Project Value

Initial material price is not the complete purchasing decision. I compare engineering effort, tooling, packaging, freight, site labor, installation duration, testing, maintenance access, corrective work, and future replacement requirements. The lowest quotation may not be the lowest total cost if it excludes interfaces or requires extensive site modification.

Common Buyer Mistakes

One common mistake is selecting a system before the architectural grid and structural movement are sufficiently coordinated. Another is comparing quotations with different scopes, such as one supplier including glass, engineering, anchors, and testing while another excludes them. Buyers should request a clear scope matrix, performance schedule, interface responsibility list, and sample details before making a final comparison.

It is also risky to treat standard dimensions as universal specifications. Glass weight, wind pressure, mullion span, anchor movement, thermal requirements, and local regulations vary by project. Any proposed specification should be verified by qualified project engineers and adjusted to the actual site conditions.

How Jangho Supports Curtain Wall Projects

At Jangho, I approach curtain wall supply as a coordinated process rather than a component-only transaction. Our support can include system selection, façade detailing, shop drawing coordination, material planning, fabrication, packaging, delivery coordination, and installation guidance, depending on the agreed project scope. We can discuss stick-built, unitized, semi-unitized, and selected specialized façade solutions according to the project’s technical requirements.

For an effective inquiry, I recommend providing architectural elevations, typical wall sections, floor-to-floor heights, location, performance requirements, estimated quantities, finish preferences, and target delivery schedule. If some information is not yet available, a preliminary discussion can still establish a practical system direction. Final design, structural verification, testing, and compliance remain subject to the project’s applicable codes and qualified engineering review.

Key Takeaways

• Stick-built systems offer field flexibility and are often suitable for smaller, irregular, or lower-rise projects.
• Unitized systems are commonly considered for repetitive façades where factory assembly and coordinated installation provide value.
• Semi-unitized systems can balance prefabrication with site adaptability.
• Structural glazing and point-supported glazing describe specialized appearance or support strategies that require additional coordination.
• Thermal, air, water, structural, fire, acoustic, logistics, and maintenance requirements should be compared together.
• A complete supplier quotation should define scope, interfaces, engineering, testing, packaging, delivery, and installation responsibilities.

Conclusion: Which Curtain Wall System Type Should You Choose?

There is no single curtain wall system type that is correct for every building. I generally consider stick-built systems when flexibility and local adaptability are priorities, unitized systems when the façade is repetitive and installation logistics support prefabricated panels, and semi-unitized systems when the project needs a combination of both approaches. Structural glazing and point-supported solutions are best evaluated for specific architectural zones and performance objectives.

Your next step should be to prepare the project drawings, performance criteria, quantities, and schedule, then request a supplier comparison based on the same scope. Jangho can help review the available options, identify coordination risks, and develop a curtain wall solution aligned with your building, budget, and delivery requirements. Contact our project team with your preliminary information to begin a technical and commercial discussion.