What Is a Stick Built Curtain Wall System? Components, Benefits, and Applications

A stick built curtain wall system is a non-load-bearing exterior wall assembled on the construction site from individual vertical mullions, horizontal transoms, glass or opaque infill panels, gaskets, pressure plates, and caps. The building structure carries the primary gravity loads, while the curtain wall transfers its own weight and environmental loads back to the structure through anchors. I use the term “stick built” to distinguish this field-assembled approach from unitized curtain wall, which is manufactured and glazed in larger factory-built panels.

Read more

For a B2B project, the right choice depends on façade geometry, floor-to-floor dimensions, wind exposure, access, labor availability, schedule, performance requirements, and the supplier’s engineering support. Stick systems can offer flexible field adjustment and efficient shipping, but they require disciplined installation, sealing, and inspection. The U.S. General Services Administration and Whole Building Design Guide describe curtain walls as non-load-bearing enclosure systems that must be coordinated with structure, weather control, movement, and other building systems.

What Is a Stick Built Curtain Wall System?

A stick built curtain wall is a “piece-by-piece” façade system. Installers generally fix vertical mullions to the building structure first, connect horizontal transoms between them, and then install glazing, spandrel panels, pressure plates, gaskets, and exterior covers. The system can be used for glazed façades, opaque insulated panels, entrance interfaces, sunshade attachments, and selected stone or metal panel applications when the framing is designed for those loads.

The curtain wall normally resists wind pressure and suction, controls rain penetration, limits uncontrolled air movement, and contributes to thermal and acoustic performance. It may also accommodate structural movement through anchors, expansion provisions, and flexible joints. It should not be treated as a substitute for a load-bearing wall, a primary roof system, or a complete waterproofing strategy without project-specific design.

Core Components and How They Work Together

Vertical Mullions and Horizontal Transoms

Vertical mullions form the main load path between the façade and the building structure. Horizontal transoms divide the façade into panels and support glazing or opaque infill at each level. The mullion depth, alloy, reinforcement, spacing, and anchoring arrangement must be selected against project wind loads, span limits, deflection criteria, glass weight, and movement requirements.

For early coordination, a buyer may review a nominal module such as 1,200 mm wide and a floor-to-floor zone such as 3,600 mm high, but these are examples rather than universal recommendations. Actual dimensions must come from structural calculations, glass make-up, architectural appearance, and local codes. A supplier should provide section properties, connection details, and design assumptions before fabrication.

Glazing, Spandrel, and Opaque Infill

Vision areas may use monolithic, laminated, insulated, low-emissivity, or solar-control glass, depending on safety, daylight, energy, and acoustic objectives. A 24 mm or 28 mm insulating glass unit may be suitable for some designs, but the final make-up depends on thermal targets, glass availability, fabrication capability, and local regulations. Spandrel zones can use back-painted glass, insulated metal panels, stone-look panels, or other approved infill materials.

Glass selection must also consider human impact, thermal stress, edge clearance, bite, deflection, and compatibility with sealants and gaskets. I recommend that buyers request a complete glazing schedule rather than approving glass by appearance alone. The International Code Council and relevant local building codes should be consulted for safety glazing, fire separation, and façade requirements.

Gaskets, Pressure Plates, Covers, and Sealants

Gaskets and sealants help create the air and water control layers around the glass and frame. Pressure plates mechanically retain the glazing, while exterior caps provide weather protection and define the architectural sightline. Drainage paths, weep openings, end dams, splice sleeves, and pressure-equalized cavities are equally important because a façade may experience repeated wetting during its service life.

Sealant selection should be based on movement capability, substrate compatibility, ultraviolet exposure, temperature range, and manufacturer instructions. ASTM C920 classifies elastomeric joint sealants by properties such as movement capability, but the standard does not remove the need for project-specific joint design and adhesion testing. I advise buyers to request sealant compatibility documentation for glass, coatings, gaskets, insulation, and adjacent waterproofing materials.

Anchors and Movement Provisions

Anchors connect the curtain wall to slabs, beams, columns, or other structural elements. They must transfer wind loads while allowing the required combination of vertical movement, interstory drift, thermal expansion, construction tolerance, and differential movement. A typical detail may include a fixed point and sliding or adjustable connections, but the correct arrangement depends on the building’s structural design.

Ignoring movement is a common cause of cracked glass, distorted frames, failed seals, and difficult installation. The curtain wall engineer should coordinate anchor locations with slab edges, firestopping, edge protection, embeds, and concrete tolerances. The American Society of Civil Engineers publishes ASCE 7, which is widely used as a basis for determining design environmental loads in the United States; projects in other jurisdictions should follow their applicable standards.

Core Functions of a Stick Built Curtain Wall

A properly designed system performs several enclosure functions at the same time. It sheds rain, limits air infiltration, moderates heat transfer, admits daylight, and presents the required external appearance. Its performance depends on the complete wall assembly, including interfaces with slabs, roofs, parapets, entrances, louvers, and adjacent opaque walls.

• Wind resistance: Mullions, transoms, glass, anchors, and fasteners transfer positive and negative pressure to the structure.
• Water management: Gaskets, seals, drainage cavities, sill flashing, and weeps control incidental water.
• Air control: Continuous seals and pressure-equalized details reduce uncontrolled air leakage.
• Thermal control: Thermal breaks, insulated glass, warm-edge spacers, and spandrel insulation influence heat flow and condensation risk.
• Movement accommodation: Joints and anchors help the façade respond to temperature changes and building movement.
• Visual enclosure: Glass, metal caps, finishes, and opaque panels create the intended architectural expression.

The Whole Building Design Guide recommends treating the building envelope as an integrated system rather than evaluating a single product in isolation. This is important because a high-performing frame can still underperform if perimeter seals, slab-edge fire containment, or adjacent waterproofing are incomplete.

Typical Applications

Commercial and Office Buildings

Stick curtain wall is commonly considered for offices, retail buildings, hotels, schools, healthcare facilities, and mixed-use developments. It is especially practical where the façade has repeated bays but the project requires some field adjustment around slab edges, corner conditions, or local geometry. The final application must still satisfy daylight, thermal, acoustic, safety, and fire requirements.

Low- and Mid-Rise Projects

Field assembly can be attractive for low- and mid-rise buildings because materials can be delivered as relatively compact lengths and installed progressively. However, “low-rise” and “mid-rise” do not establish a universal height limit for the system. Wind pressure, span, access, lifting strategy, labor capability, and local code requirements determine whether a stick system is technically and commercially appropriate.

Renovation and Irregular Façades

For renovation work, a stick system may offer useful flexibility when existing openings, structural lines, and access conditions are not perfectly repetitive. Installers can measure and adjust certain field conditions before final closure, subject to approved tolerances and engineering limits. Existing structure must be surveyed carefully because field flexibility does not compensate for unknown anchors, unstable substrates, or inadequate perimeter waterproofing.

Goto Jangho to know more.

Stick Built Curtain Wall Types and Material Options

Most stick systems use thermally improved aluminum framing because aluminum offers a favorable balance of weight, corrosion resistance, extrusion capability, and architectural finish options. Thermal breaks may use polyamide or other engineered components, while finishes may include anodized surfaces or powder coatings selected for the exposure and appearance requirements. The specific alloy, temper, coating class, and finish warranty should be confirmed in the technical submittal.

Framing can be pressure-glazed, captured, or structurally glazed, depending on the approved system design and local practice. Captured systems use pressure plates and exterior caps, while structural glazing uses compatible silicone bonding and requires strict fabrication, inspection, and quality-control procedures. I recommend selecting a proven system family rather than combining profiles, gaskets, glass, and accessories from unrelated sources without engineering approval.

These values are specification categories and illustrative examples, not universal performance claims. Test pressure, allowable deflection, U-value, air leakage, and wind pressure must be established by the project consultant and applicable standards. ASTM E283, ASTM E331, and ASTM E330 are commonly referenced test methods in North American curtain wall specifications, while other markets may use EN or national standards.

Benefits and Limitations

Main Benefits

The primary advantage of a stick built system is field flexibility. Individual components can be shipped in manageable lengths, staged by elevation, and adjusted within approved tolerances during installation. This can support projects with varied bay widths, complex interfaces, phased construction, or limited access to large lifting equipment.

Stick systems can also provide broad design freedom through different mullion depths, cap profiles, glass types, finishes, spandrel treatments, and sun-control accessories. Because the frame is assembled on site, repair or replacement of selected components may be straightforward when access and replacement details are planned. These benefits depend on a coordinated design and an experienced installation team.

Main Limitations

Field assembly creates greater dependence on site workmanship, weather conditions, inspection, and sequencing. A system that performs well in laboratory testing can be compromised by damaged gaskets, incomplete seals, incorrect pressure-plate torque, blocked drainage, or poor perimeter interfaces. Site quality control is therefore a procurement issue, not only an installation issue.

Compared with a unitized system, a stick system may require more façade labor at the building and may progress more slowly on tall, repetitive projects. The correct comparison should include access, scaffolding, hoisting, labor rates, inspection, storage, rework risk, and schedule—not only the quoted material price. A façade consultant or qualified engineer should confirm the best system for the actual project constraints.

How B2B Buyers Should Evaluate a System

1. Confirm the Performance Brief

Start with the project location, building height, exposure category, wind design data, seismic or drift requirements, thermal target, acoustic target, fire strategy, glass safety requirements, and appearance schedule. Confirm whether the specification requires project-specific mock-ups, laboratory testing, field testing, or performance verification. This brief becomes the reference point for comparing suppliers.

2. Review Engineering and Interfaces

Ask for typical vertical, horizontal, corner, sill, head, jamb, splice, and anchor details. Review how the system interfaces with slab-edge fire containment, waterproofing, insulation, sunshades, louvers, doors, and adjacent walls. Request calculations or engineering confirmation for mullion spans, glass loads, anchors, and expected movement rather than accepting only a marketing brochure.

3. Check Manufacturing and Quality Controls

Evaluate extrusion sourcing, machining capability, coating or anodizing control, gasket storage, glass processing, packing, labeling, and inspection records. A practical submittal should identify profile codes, finish specifications, glass make-ups, sealants, gaskets, fasteners, and installation sequence. If the supplier cannot clearly distinguish tested system configurations from customized proposals, technical risk increases.

4. Compare Total Delivered Cost

Compare the complete package, including profiles, glass, panels, hardware, anchors, sealants, packing, shipping, site support, testing, spare materials, and installation responsibility. Confirm the quotation currency, Incoterms, packaging dimensions, estimated production duration, approval milestones, and replacement-part process. Lead time should be tied to approved shop drawings and material availability rather than presented as an unconditional promise.

How Jangho Can Support Curtain Wall Procurement

At Jangho, I approach a stick built curtain wall inquiry as a coordinated façade package rather than a profile-only purchase. Our discussion can begin with drawings, elevations, schedules, project location, performance requirements, and target delivery sequence. From there, we can help organize system selection, material options, shop-drawing coordination, bill-of-material review, packing requirements, and communication between the project team and manufacturing side.

For a responsible quotation, I would ask the buyer to provide the available façade drawings, typical bay dimensions, floor-to-floor height, glass specification, finish requirements, design wind data, applicable standards, quantities, delivery destination, and installation scope. Where information is incomplete, I will identify assumptions clearly instead of presenting unverified performance values. Final engineering responsibility, code compliance, and site installation should remain with the appointed project professionals unless those services are expressly included in the contract.

Key Takeaways for Project Teams

• A stick built curtain wall is a field-assembled, non-load-bearing façade made from mullions, transoms, glazing or panels, gaskets, pressure plates, caps, anchors, and sealants.
• Its performance depends on the complete enclosure, including drainage, air seals, thermal breaks, movement joints, fire containment, and adjacent construction.
• Its strongest advantages are field flexibility, manageable component shipping, and suitability for varied or phased façades.
• Its main risks are site workmanship, weather exposure during installation, interface errors, and labor or schedule pressure.
• Buyers should evaluate wind pressure in kPa, water test pressure in Pa, air leakage in L/s·m², thermal performance in W/m²·K, glass thickness in mm, and movement or deflection criteria.
• Supplier selection should include engineering, documented system details, quality control, packaging, delivery planning, and post-delivery technical support.

Conclusion: Is a Stick Built Curtain Wall Right for Your Project?

A stick built curtain wall system is a practical choice when a project needs a flexible, field-assembled glazed façade and has the labor, access, engineering, and inspection resources to install it correctly. It is often worth considering for commercial, institutional, renovation, irregular, and low- to mid-rise applications, but no universal height or performance limit can be assigned without project data. The final decision should be based on the building envelope brief, structural calculations, local code, interfaces, schedule, and total installed cost.

My recommended next step is to prepare a concise inquiry package containing the elevation drawings, typical sections, module dimensions, glass and finish requirements, design loads, applicable standards, quantity, destination, and required delivery date. Jangho can then review the information, identify missing inputs, and develop a technically transparent proposal for the stick built curtain wall scope. This process gives the project team a clearer basis for comparing systems, controlling procurement risk, and moving toward approved shop drawings.

Ready to discuss your curtain wall requirement? Send Jangho your project drawings and performance brief for an initial product and supply review. We can help clarify suitable components, material options, technical documentation, packing, delivery coordination, and the information required for a reliable B2B quotation.

Reference Sources

• Whole Building Design Guide, Building Envelope Design Guide
• ASTM E283, Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors
• ASTM E331, Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls
• ASTM E330, Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls
• American Society of Civil Engineers, ASCE 7: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
• International Code Council, International Building Code resources