Kawneer curtain walling and stick system glazing compared
Selecting a facade system affects far more than the appearance of a building. The choice influences structural coordination, weather protection, installation sequencing, thermal performance, labour requirements and the level of risk retained on site. For developers, architects and main contractors, understanding these differences early can prevent costly redesigns and programme delays.
Kawneer is widely recognised for aluminium curtain walling and architectural glazing systems used across commercial, residential, education, healthcare and mixed-use developments. Its product range supports different configurations, infill options and performance requirements, while stick-built glazing remains a familiar solution for many low- and mid-rise projects.
The key point is that these terms are not always direct opposites. Curtain walling describes a non-loadbearing external wall system, while “stick system” usually describes how that system is manufactured and assembled. A Kawneer curtain wall may itself be installed as a stick-built system, so the correct comparison is often between a site-assembled curtain wall approach and a more pre-engineered or unitised facade strategy.
What the comparison really means
Curtain walling is fixed back to the structural frame of a building and transfers its own weight, wind loads and infill loads through brackets and anchors. It does not generally carry floor slabs or form part of the primary structural frame. Aluminium mullions and transoms create a grid that can accommodate glass, panels, spandrel elements, doors, vents and other facade components.
A stick system is assembled from individual components at the project location. Vertical mullions are installed first, followed by horizontal transoms, gaskets, pressure plates, caps and infill panels. The method is flexible and well suited to buildings where dimensions may change during construction or where access makes factory-based facade installation less practical.
Kawneer systems such as AA100, AA110 and related curtain wall solutions can be specified in configurations that suit different building heights, spans, thermal requirements and visual treatments. The presence of a Kawneer specification does not automatically determine the installation method. The project team still needs to establish whether a conventional stick-built arrangement, a unitised solution or a hybrid approach is most appropriate.
How the systems are assembled
With stick-built glazing, most components arrive as lengths or separate parts. Installers cut, join, level and seal the framing on site, making accurate setting-out essential. This approach allows adjustments around slab edges, corners and interfaces, although excessive site modification can affect quality and reduce the predictability of installation time.
A more pre-assembled curtain wall solution is manufactured in larger panels, often under controlled factory conditions. Frames, gaskets, glass and selected panels may be integrated before delivery, reducing the amount of work required at height. The trade-off is that design information, structural tolerances, lifting access and delivery logistics must be resolved much earlier.
Whichever approach is selected, the junctions between facade zones require detailed coordination. Vapour control, insulation continuity, drainage paths and airtightness all influence the completed envelope. Guidance on vapour barrier design is particularly relevant where curtain walling meets insulated cladding, roofing membranes or internal linings, because an apparently minor discontinuity can lead to condensation and energy performance problems.
Performance and design implications
Both systems can achieve strong levels of weather resistance, thermal performance, acoustic control and structural capacity when correctly designed and installed. The final result depends on the exact Kawneer system, glass specification, gaskets, pressure plates, thermal breaks, anchoring arrangement and perimeter interfaces rather than the product name alone.
Stick-built glazing offers considerable design adaptability. Mullion spacing, opening lights, glass types and panel locations can be coordinated in response to architectural revisions. It can also be useful for smaller elevations, irregular geometries and phased construction. However, a large amount of site workmanship means that sealing, joint formation and drainage details must be consistently controlled.
Factory-assembled systems can provide greater repetition and manufacturing consistency, particularly across large elevations with standardised grids. They may reduce exposure to poor weather during installation and improve the predictability of facade quality. Their limitations can include restricted panel dimensions, higher transport demands and less tolerance for late changes to structural openings.
| Consideration | Stick-built Kawneer glazing | More pre-assembled curtain wall approach |
|---|---|---|
| Main assembly location | Predominantly on site | Greater proportion completed in a factory |
| Design flexibility | High during installation | Best when geometry is agreed early |
| Labour profile | More site labour and supervision | More factory coordination and lifting |
| Programme effect | Can suit phased or smaller elevations | Can accelerate repetitive facade installation |
| Quality control | Highly dependent on site workmanship | More controlled during manufacture |
| Logistics | Smaller components and simpler deliveries | Larger units, specialist transport and storage |
| Late design changes | Generally easier to accommodate | Potentially disruptive and expensive |
| Best fit | Varied, low- to mid-rise or complex areas | Repetitive, larger-scale and tightly programmed facades |
Programme, cost and site control
Initial supply and installation cost should not be considered in isolation. A stick system may appear economical because it uses standard lengths and conventional site processes. Yet the total cost can rise where access is difficult, working-at-height periods are prolonged, weather interrupts installation or extensive supervision is required.
Pre-assembled facade panels may carry higher design, fabrication and logistics costs at the outset. They can reduce installation time, simplify repetitive elevations and allow other trades to progress sooner. On constrained urban sites, however, delivery scheduling, crane capacity, storage limitations and lifting plans may offset some of those benefits.
The most reliable comparison considers the whole package: surveys, design development, structural calculations, samples, procurement, transport, access equipment, installation, testing, remedial work and handover. A specialist envelope contractor can identify whether a system is genuinely economical for the building rather than relying on a simple cost per square metre.
Site tolerance is another important factor. Curtain walling must accommodate movement between floors, construction tolerances and differential expansion. If the supporting structure is not surveyed accurately, even a well-designed system can face difficult adjustments. Early coordination between the facade contractor, structural engineer and main contractor is therefore essential.
Integration with cladding and roofing
Glazed curtain walling is rarely installed as an isolated package. It commonly interfaces with rainscreen cladding, insulated panels, parapets, copings, roofing membranes and internal finishes. These junctions must be designed as part of a continuous building envelope, with clear responsibility for flashings, closures, cavity barriers, insulation and seals.
The relationship with insulated metal panels is especially important in industrial and logistics buildings. Where a project combines glazing with warehouse cladding, the selection of the panel system, support rails and perimeter details can affect the curtain wall interface. This overview of Kingspan insulated panels explains why panel performance and installation characteristics matter in larger envelope packages.
Roofing interfaces deserve equal attention. Curtain wall heads, parapets and roof abutments must maintain drainage, airtightness and insulation continuity. A visually clean facade can still underperform if the roof-to-wall junction contains thermal bridges or poorly coordinated membranes.
For this reason, an integrated contractor can provide an advantage where glazing, cladding and roofing are procured together. One coordinated design process can reduce gaps between trade packages and make testing, defect resolution and final handover more straightforward.
Choosing the right approach for the building
Stick-built Kawneer glazing is often well suited to projects with moderate facade areas, varied elevations or a need for installation flexibility. It can work effectively on office refurbishments, apartment schemes, schools, retail units and extensions where openings are not entirely repetitive or where access is available from internal floors or conventional platforms.
A more pre-assembled curtain wall method may be advantageous for tall buildings, large commercial developments and schemes with a highly repetitive facade grid. Faster floor-by-floor installation, reduced site assembly and factory-controlled fabrication can support demanding programmes, provided the design is sufficiently mature before manufacture begins.
The building’s geometry should be assessed alongside its height and exposure. Wind loads, mullion spans, glass weight, movement requirements and maintenance access all affect the specification. A system that is suitable for a sheltered low-rise elevation may require different profiles, anchors or infill arrangements on an exposed multi-storey building.
Architectural intent also matters. Narrow sightlines, deep reveals, projecting fins, feature panels and concealed drainage may favour one system configuration over another. Early mock-ups and performance testing can confirm how the proposed facade will look and behave before the full package is released for manufacture.
Recommendations for project teams
A sound specification should compare installation methods as well as products. The following actions help establish whether a Kawneer stick-built curtain wall or another curtain wall configuration is appropriate:
- Define the required thermal, acoustic, airtightness, water and wind-load performance before selecting profiles and infill.
- Review structural tolerances, slab-edge details, movement joints and anchor positions with the facade contractor at an early stage.
- Coordinate curtain walling with cladding, roofing, cavity barriers, insulation and internal finishes as one envelope package.
- Assess whole-life cost, access, lifting, storage, testing and maintenance rather than comparing supply rates alone.
- Use representative samples or a project-specific mock-up to verify appearance, interfaces, drainage and installation quality.
The selected system should also be supported by clear responsibility matrices and coordinated fabrication drawings. These documents need to show where the glazing contractor’s work starts and finishes, how adjacent materials are sealed, and who provides or installs interface components.
Testing and inspection should be planned before installation starts. Site checks may include anchor positions, mullion alignment, gasket continuity, glass condition, pressure plate fixing, sealant application and drainage openings. Where performance is critical, field water testing and airtightness checks can provide useful evidence before internal finishes conceal the work.
Bak Cladding Solutions can help project teams develop a coordinated approach to curtain walling, roofing and cladding, from design consultation and material specification through installation and handover. Engage an experienced building envelope contractor early to compare Kawneer configurations, confirm interfaces and deliver a facade package aligned with the building’s programme and performance requirements.