Stick Curtain Wall: A Complete Guide to Selection, Specifications, and Project Procurement

A stick curtain wall is a site-assembled façade system in which vertical mullions, horizontal transoms, glass, panels, gaskets, pressure plates, and caps are installed piece by piece on the building structure. I recommend it when a project requires flexible dimensions, phased delivery, on-site adjustment, and a practical solution for low- to mid-rise commercial, institutional, residential, and mixed-use buildings. The correct selection depends on structural movement, wind pressure, water and air performance, thermal requirements, fire strategy, appearance, installation conditions, and procurement risk—not only on the visible frame profile.

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This guide explains how I evaluate a stick curtain wall from concept design through supplier quotation. It covers system composition, material choices, key specifications, project matching, cost and lead-time considerations, and a procurement checklist. Because performance depends on the complete façade assembly and local regulations, I use conservative language and recommend project-specific engineering verification before approval.

Key Takeaways for Project Buyers

• A stick curtain wall is assembled on site from linear profiles and infill components rather than delivered as complete factory-glazed units.
• Its main advantages are dimensional flexibility, accessible site logistics, and the ability to adjust installation sequentially.
• Its main risks include greater dependence on site workmanship, weather exposure during installation, and coordination between multiple trades.
• Buyers should specify design wind pressure, water and air requirements, thermal targets, glass configuration, movement allowances, finish, tolerances, and testing responsibilities.
• Supplier comparison should include engineering support, system compatibility, drawings, samples, replacement parts, packaging, inspection, and after-sales coordination.

Who This Stick Curtain Wall Guide Is For

I prepared this guide for architects, façade consultants, general contractors, developers, project procurement teams, and distributors who need to compare stick curtain wall options before issuing a technical specification or request for quotation. It is especially useful when a project has changing opening sizes, limited site access, phased construction, or a requirement to source components internationally. It can also help buyers distinguish between a complete engineered system and a basic profile supply package.

The guide is not a substitute for stamped calculations, local code review, or a project-specific façade test program. Curtain wall performance is affected by the building geometry, anchors, substrate, glass, seals, drainage paths, installation sequence, and interfaces with roofs, parapets, slabs, and adjacent walls. I therefore treat the information below as a procurement and early-design framework rather than a universal approval specification.

What Is a Stick Curtain Wall?

Basic System Concept

A stick curtain wall normally uses vertical mullions fixed to floor edges or other supporting locations, followed by horizontal transoms that divide the façade into glazed or panelized bays. Glass, spandrel panels, louvers, doors, vents, and opaque infills are then installed into the formed openings. The curtain wall transfers its own weight and environmental actions to the building structure, but it is generally not intended to replace the primary structural frame.

Unlike a unitized curtain wall, which is assembled into large factory-made panels, a stick system is delivered as profiles and separate components for site assembly. This difference affects labor, transportation, storage, quality control, installation speed, and the level of adjustment available during construction. The National Institute of Building Sciences’ Whole Building Design Guide identifies curtain wall as a non-load-bearing exterior wall system and discusses the importance of interfaces, drainage, and performance coordination in façade design.

Source: Whole Building Design Guide, Glazed Curtain Wall.

Core Components

• Mullions: Vertical profiles that resist wind-related pressure and suction, support infill, and transfer reactions to anchors.
• Transoms: Horizontal profiles that divide the elevation and support or retain glass and panels.
• Anchors and brackets: Connections between the curtain wall frame and the building structure.
• Pressure plates and caps: External or concealed retention components, depending on the system design.
• Gaskets and sealants: Components that help control air, water, glass movement, and tolerance interfaces.
• Thermal separators: Polyamide or other insulating elements used to reduce direct metal heat transfer in thermally improved systems.
• Infill materials: Insulating glass units, laminated glass, monolithic glass, metal panels, stone-look panels, or other approved assemblies.

Types, Materials, and Configuration Options

Framing Materials and Finishes

Aluminum is the most common framing material because it combines relatively low weight, corrosion resistance, extrusion flexibility, and compatibility with anodized or painted finishes. Common finish choices include anodizing and architectural powder coating, but the required color, gloss, pretreatment, coating class, and warranty terms should be confirmed for the project environment. For coastal, industrial, or high-pollution locations, I ask for a specific finish specification rather than accepting a generic “weather-resistant” description.

Many systems use a nominal frame sightline near 50 mm, but the visible width is not universal and must be confirmed from the supplier’s section drawings. Mullion depth can vary substantially according to span, glass weight, wind pressure, anchor spacing, and deflection limits. I do not recommend selecting a profile from sightline alone because a narrow appearance may require additional reinforcement or may not satisfy the project’s structural calculation.

Glass and Infill Choices

Infill selection may include single glazing, double insulating glass units, triple insulating glass units, laminated glass, heat-treated glass, fritted glass, spandrel glass, or opaque panels. A double insulating glass unit commonly has two panes and one sealed cavity, but the actual thickness, cavity width, coating, gas fill, edge spacer, and safety classification must be stated in the specification. For example, a project may compare a 6 mm outer pane with a 12 mm cavity and 6 mm inner pane, but this configuration must be checked for thermal, acoustic, safety, and structural suitability rather than assumed to be adequate.

For safety-critical locations, glass type and thickness should be determined by the applicable building code, human-impact requirements, wind loading, thermal stress analysis, and the consequences of breakage. Spandrel zones also require coordination with insulation, slab-edge fire containment, shadow boxes, and interior finishes. I recommend treating the glass, frame, gaskets, setting blocks, and sealants as one tested or engineered assembly.

Key Stick Curtain Wall Specifications

Air, water, and structural performance should be evaluated using the test standards and acceptance criteria required by the project location. In North America, ASTM E283 is commonly associated with air leakage testing, ASTM E331 with static water penetration testing, and ASTM E330 with structural performance testing; the applicable edition and project criteria must be confirmed by the design team. The U.S. General Services Administration also emphasizes whole-building enclosure coordination and performance verification rather than relying only on product descriptions.

Sources: ASTM International, ASTM E283; ASTM International, ASTM E331; Whole Building Design Guide, Building Enclosure Design Guide.

How to Select a Stick Curtain Wall for a Project

Step 1: Establish Project Inputs

I begin with the building location, elevation, exposure category, height, floor-to-floor dimension, bay width, opening schedule, substrate condition, and installation access. A 3 m floor-to-floor height and a 1.5 m bay width, for example, create different mullion demands from a 4.2 m floor-to-floor height and a 2.4 m bay width. These dimensions are examples of design inputs, not universal system limits, and they should be verified through calculations.

Step 2: Define Performance Targets

The project team should establish design wind pressure, allowable frame deflection, water penetration criteria, air leakage criteria, thermal targets, acoustic requirements, solar-control objectives, and safety-glazing requirements. Thermal targets may be expressed as U-values in W/m²·K, while solar control may be assessed through solar heat gain coefficient and visible transmittance. I ask the buyer to define the measurement basis because center-of-glass, frame, and whole-product values are not interchangeable.

Step 3: Select the Framing and Infill Strategy

Next, I compare standard and thermally improved framing, captured or structural glazing appearance, cap profiles, glass thickness, panel zones, vents, doors, and access requirements. If the façade includes a high percentage of opaque spandrel, the team should coordinate insulation continuity and slab-edge details early. If the design includes operable vents or doors, the hardware, drainage, movement, and maintenance requirements must be checked as part of the curtain wall package.

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Step 4: Verify Testing and Engineering

A supplier quotation should identify the calculation basis, system drawings, material grades, finish specification, gasket compatibility, sealant requirements, and testing responsibility. For a complex or high-risk façade, I recommend a representative performance mock-up or laboratory test when required by the consultant, code, or contract documents. A product brochure alone cannot confirm project performance because the installed result depends on joints, anchors, interfaces, workmanship, and approved installation details.

Step 5: Review Installation and Maintenance

Stick systems require coordinated site sequencing, safe glass handling, clean storage, accurate setting blocks, controlled sealant application, and inspection of gaskets and drainage paths. The buyer should confirm whether the site has sufficient lifting equipment, weather protection, storage space, access platforms, and trained installers. Maintenance planning should also address glass replacement, cap removal, gasket replacement, sealant renewal, and access to drains or pressure-equalization cavities.

Application Matching: Where Stick Curtain Wall Fits Best

Stick curtain wall is often considered for office buildings, schools, hotels, retail façades, apartment common areas, healthcare projects, entrance halls, and smaller or irregular elevations. It can be practical where floor-by-floor installation is convenient and where transportation or hoisting restrictions make large unitized panels difficult to handle. It may also suit renovation or extension projects that require field measurement and incremental adaptation.

For very tall buildings, highly repetitive façades, accelerated schedules, or sites with limited exterior access, a unitized system may deserve comparison because factory assembly can shift more work into controlled conditions. That does not make unitized construction automatically better; the best choice depends on building geometry, labor availability, logistics, design maturity, tolerances, and local installation capability. I recommend a documented comparison of total installed cost and schedule rather than comparing profile prices alone.

Cost, MOQ, Lead Time, and Procurement Considerations

What Drives Total Cost

Stick curtain wall cost is influenced by aluminum weight, extrusion complexity, finish, glass specification, panel content, hardware, gaskets, anchors, packaging, engineering, testing, shipping, installation labor, access equipment, and project management. A lower material price may not produce a lower installed cost if it creates more site cutting, rework, custom tooling, or packaging damage. I therefore request a line-item quotation separating profiles, glass, accessories, engineering, samples, testing, packing, freight, and optional services.

MOQ and Lead-Time Questions

Minimum order quantity can vary by extrusion die, finish, glass type, color, and production batch, so it should be confirmed in writing for each project. Lead time should be broken into drawing approval, die preparation if needed, extrusion, surface treatment, glass processing, assembly or kitting, inspection, packing, and transport. As a planning example, a buyer may need to coordinate a 2-week technical review and a 6-week production window, but these are planning assumptions rather than a supplier promise and must be validated against the actual bill of materials and production schedule.

International buyers should also confirm Incoterms, export packing, container utilization, spare parts, labeling, replacement procedures, customs documents, and responsibility for damage inspection. Shipment quantities should be matched to installation zones so that profiles and accessories arrive in a usable sequence. A phased delivery plan can reduce site congestion, but it may increase packaging, handling, and inventory-control requirements.

Supplier Evaluation Checklist

1. Can the supplier provide system sections, installation details, material specifications, and project-specific calculations?
2. Are the proposed mullion depths, transom sections, anchors, and glass supports compatible with the design loads?
3. Does the supplier clearly identify air, water, structural, thermal, acoustic, and fire-interface responsibilities?
4. Can the supplier provide finish samples, glass samples, gasket information, and a method for approving color and appearance?
5. Are drawings, shop drawings, bill of materials, packing lists, inspection records, and replacement-part information included?
6. Can the supplier coordinate with the façade consultant, architect, contractor, glass processor, and installer?
7. Are quotation validity, MOQ, lead time, delivery terms, warranty scope, exclusions, and payment milestones transparent?

I also recommend asking for evidence of relevant production capability without assuming that a general factory statement proves project suitability. Useful evidence may include anonymized technical drawings, sample inspection procedures, material traceability documents, coating information, and references to applicable test methods. Any certification, test report, or compliance statement should be checked for its issuing body, scope, product configuration, date, and relevance to the actual proposed assembly.

Common Procurement Mistakes

Comparing Only Aluminum Price

Comparing aluminum price per kilogram or per square meter can hide differences in glass, finish, thermal breaks, accessories, engineering, packaging, and installation responsibility. Two quotations that appear similar may contain different assumptions about anchors, sealants, drainage components, and testing. I prefer a compliance matrix that lists every required component and identifies whether it is included, excluded, or subject to confirmation.

Approving Profiles Before Structural Review

A visually attractive profile may be unsuitable for the project span, pressure, movement, or glass weight. The supplier and façade consultant should review mullion inertia, anchor spacing, load combinations, deflection criteria, and connection details before final approval. The same principle applies to thermal performance because a nominal thermal break does not by itself establish a whole-window or whole-curtain-wall U-value.

Ignoring Interfaces and Site Conditions

Many façade problems occur at transitions rather than in the center of a standard bay. I ask the team to review slab edges, corners, parapets, roofs, doors, vents, fire containment, adjacent masonry, waterproofing, and movement joints through coordinated details. Installation training, inspection hold points, and water-management checks should be included in the project plan instead of treated as informal site activities.

How Jangho Can Support Stick Curtain Wall Procurement

At Jangho, I can structure a project discussion around the elevation drawings, opening schedule, performance requirements, glass build-up, finish, delivery location, and installation method. Based on the information provided, our team can help organize a preliminary system proposal, component list, technical questions, sample requirements, and quotation scope for review. Final suitability remains subject to project engineering, applicable code requirements, approved drawings, and the responsibilities defined in the contract.

For an efficient inquiry, I recommend sending the building location, façade elevations, typical bay dimensions, floor-to-floor heights, design wind data if available, glass requirements, target finish, estimated quantity, required delivery date, and whether installation support is needed. If the project is still at concept stage, a marked-up elevation and preliminary performance brief can be a useful starting point. This information allows the supplier to identify missing inputs before pricing and reduces the risk of comparing incomplete offers.

Conclusion: A Practical Decision Path

A stick curtain wall is a flexible, site-assembled façade solution that can fit projects requiring adaptable dimensions, phased installation, and manageable component logistics. Its success depends on a complete system approach covering structural design, drainage, air and water control, thermal performance, glass safety, fire interfaces, finish quality, and installation workmanship. I would select it when those project conditions align and when the team can control site coordination effectively.

The next step is to prepare a project data sheet and request a technically itemized quotation from qualified suppliers. Ask for system sections, calculations, performance criteria, material and finish details, delivery assumptions, testing responsibilities, and installation requirements before comparing price. To discuss a Stick Curtain Wall package with Jangho, send the project drawings and procurement brief so we can identify the required information, clarify scope, and develop a suitable quotation path.