Glazing Curtain Wall — All 25 Questions

A glazing curtain wall is a glazed façade built from large modules assembled and sealed in the factory, then craned into place on site. Because the weather-tight unit is completed off-site, quality control is higher and on-site installation is faster than stick-built systems.

INDECO glazing curtain wall is tested for structural wind load, water penetration, air leakage and cyclic movement. In the Waterfront Commercial Tower (Dubai) specification, the system was engineered for peak structural wind pressure up to 4.5 kPa (ASTM E330 / ASCE 7-22) and water tightness at 750 Pa with no leakage (ASTM E331). The test regime is explained in our curtain wall performance testing guide, and the system itself is detailed on the glazing curtain wall page.

A typical INDECO unit pairs a Low-E tempered outer pane, a warm-edge argon-filled cavity and an inner lite — for example 6 mm Low-E + 12 mm argon + 6 mm (6+12A+6). The Dubai specification used 8 mm Low-E + 16 mm argon + 12 mm laminated for higher security and acoustics.

Yes. Low-E coatings and argon-filled cavities keep solar heat gain low (SHGC ≤ 0.22) while letting in daylight (visible transmittance ≥ 40%), with U-values around 1.4 W/m²·K — reducing both cooling and lighting loads.

In a unitised system the entire module — frame, glass and seals — is assembled and tested in the factory, then hoisted into place. Stick-built systems are assembled piece by piece on site. Unitised delivery is faster to install and offers higher, more consistent quality control.

With laminated inner lites the system reaches STC 42 in the Waterfront Commercial Tower (Dubai) specification, cutting outside traffic and façade noise. Higher ratings are available using thicker acoustic interlayers.

Frames use marine-grade aluminium with anodised or PVDF finishes, stainless fixings and tropicalised gaskets. This protects the system against salt, humidity and intense sun — important for Middle East and African coastal projects.

Modules reach up to 1.5 × 4.0 m per unit, with options for double-skin, low-E, solar-control and acoustic-laminated glass. The exact size is balanced against wind load, crane capacity and the building's grid.

Every project is verified for structural wind load (ASTM E330 / ASCE 7-22), water penetration (ASTM E331), air leakage and cyclic movement, plus EN permeability (A4) and watertightness (RE 1200). Four standard tests confirm façade integrity before delivery.

Because units are factory-built, most projects move from approved drawings to container shipment in a predictable window; lead time depends on area, glass type and site programme. We confirm a schedule after the specification is frozen.

INDECO uses a two-stage weatherseal: a primary structural silicone (SSG) that bonds the IGU to the frame, plus a secondary EPDM or silicone gasket for redundancy and drainage. Joints are engineered for the project's movement tolerance and cured under controlled factory conditions for consistent adhesion.

Yes. Units can integrate concealed operable vents, tilt windows or smoke-exhaust vents without breaking the unitised grid, so natural ventilation and maintenance access are possible while keeping the façade's clean modular rhythm.

The aluminium frame and sealed IGU carry a 25+ year design life with minimal maintenance — periodic inspection of gaskets and drainage, plus glass cleaning. INDECO supplies a maintenance manual and replacement gasket schedule with every project.

Because every module arrives factory-sealed and pre-finished, site work is mainly hoisting and hooking units to the slab brackets. A trained crew typically closes several units per day per crane, so a tower floor can be weather-tight within days rather than weeks. The exact rate depends on module size, crane count and site logistics — we model it during the installation-plan phase.

Each module carries its own movement joint: slotted bracket holes and resilient setting blocks absorb inter-storey drift, daily thermal expansion and long-term creep. The factory-cured silicone joints are engineered per project for the calculated movement tolerance, and the system is cyclic-tested so seals stay elastic after tens of thousands of movement cycles.

Standard modules reach up to 1.5 × 4.0 m per unit; taller one-storey-plus modules can be engineered where the building grid and transport route allow. The practical limit is set by crane capacity (a typical 300–450 kg module) and road transport height — we check both before freezing the module division.

Finished units travel in A-frame steel stillages, padded per module, loaded so glass never bears load. On site a tower crane or hoist lifts the stillage to the floor, then a vacuum suction lifter rotates and sets each unit onto its bracket. Just-in-time batch delivery keeps site storage to a minimum — usually a few days of stock.

The system is tested to class A4 air permeability under EN 12152 — the highest classification — with factory-cured gaskets and silicone joints doing the sealing instead of site-applied mastic. That is why unitised façades hold their airtightness over the building's life: the critical seals never see weather during installation.

INDECO glazing curtain wall is tested and certified against both ASTM and EN regimes: structural performance to ASTM E330 with ASCE 7-22 wind pressures, water penetration to ASTM E331, air leakage to EN 12152 class A4, and watertightness to EN 12154 class RE 1200. Project-specific codes (e.g. Dubai Municipality, NZS 4284, AS 2047) are covered through the engineering review in phase 1.

Yes. The unitised principle — individual units hanging on slotted brackets with movement joints between them — is inherently drift-tolerant. The system is cyclic-movement tested for building sway and seismic activity, and for high-seismic projects we size the joint travel to the code drift requirement (for example ASCE 7 or NZS 1170) with third-party review.

Yes. For coastal hurricane exposure the design wind pressure is calculated per ASCE 7-22 including hurricane importance factors, and the 4.5 kPa structural capacity of our tested specification covers most high-rise coastal sites. Impact-resistant laminated outer lites and reinforced anchors are specified where HVHZ (High-Velocity Hurricane Zone) rules such as Miami-Dade apply.

Unitised pricing depends on module size, IGU build-up, finish and quantity — as a factory product it is quoted per unit rather than per site hour. It typically prices above stick-built on material but below it on installed cost, because site labour and programme risk drop sharply. Send us the elevation area, grid and glass specification for a budget quote within days.

Installation follows the floor-casting sequence: anchors and brackets go in as each slab is poured, units follow a floor or two behind, and the internal trades start once the weather line passes. We issue a floor-by-floor installation and delivery plan in phase 3 so modules arrive just-in-time and never block the site.

Both models work. We can send our certified installation team with a dedicated supervisor, or train and supervise the main contractor's crews — setting-out briefings, hoisting method statements and anchor pull-out testing are included either way. Many of our New Zealand, Australian and Southeast Asian projects used a hybrid: INDECO supervision with local labour.

Check four things: (1) test evidence — actual ASTM/EN reports on the tested system, not just brochures; (2) factory control — ISO-certified production with batch inspection you can audit; (3) delivered references of similar scale and climate; (4) engineering depth — in-house FEA, BIM shop drawings and a named engineer who answers your questions. Our four-test protocol and 65+ delivered projects exist precisely to make that check easy.