Curtain wall system
Unitized Curtain Wall System
Glazed and sealed in the factory, set floor by floor on site.
- 140 / 160 / 180 mm depth
- ±1 mm unit tolerance
- Up to 1,500 × 4,200 mm
Overview
How the system is built
BLTC manufactures and exports this system to facade contractors, developers and importers in North America, the Gulf and Europe. Unitized is the default system for towers above roughly fifteen storeys, and for any project where facade installation has to be fast, predictable and possible with a small crew. Each panel reaches site fully glazed, with spandrel, insulation, fire-stop and gaskets already fitted. The site team sets the unit, levels it and engages the interlock — no scaffolding-width work front, no glazing at height.
We detail from your shop drawings or produce them in-house from architectural drawings. Wind-load deflection, inter-storey drift and thermal movement are calculated before the first extrusion is cut, and the initial production units are assembled on a full-size mock-up for the consultant to sign off.
Specifications
Unitized Curtain Wall data
Ranges we manufacture to. Project values are fixed by calculation and confirmed on the approved shop drawings.
| Material | AA6063-T5 extrusions; AA6061-T6 for structural mullions |
|---|---|
| System depth | 140 mm, 160 mm or 180 mm face-to-back |
| Surface finish | PVDF 70% KYNAR 500 (2- or 3-coat), 25–35 µm; anodized 15–25 µm |
| Glazing | IGU 6+12A+6 to triple glazed; laminated 6.38–13.52 mm; low-E and solar-control |
| Maximum panel size | 1,500 × 4,200 mm (W × H); 2,000 mm width on request |
| Fire rating | B-s1,d0 to EN 13501-1; 1 h and 2 h rated spandrel build-ups |
| Air and water | EN 12152 Class AE; EN 12154 Class RE 1200 |
| Wind load | Design to 5.0 kPa, tested to 7.5 kPa |
| Thermal performance | Ucw 1.1–2.0 W/m²K depending on glazing |
| Acoustic performance | Rw 38–45 dB depending on glass build-up |
| Design life | 25 years minimum; 30-year coating warranty available |
Indicative values for preliminary sizing. Project values are confirmed by structural calculation, thermal modelling and mock-up testing before production.
System details
Joints, movement and anchorage
The four details that decide whether the facade performs for twenty-five years. Project-specific drawings are issued for approval before production.
01
Unit frame and factory assembly
Mullions and transoms are cut on CNC lines and assembled on fixed steel jigs. Corners are crimped and sealed with two-component silicone, so the frame is watertight before glazing. Every unit is measured against its shop-drawing number and recorded before it is packed.
02
Double-wall interlock and drainage
Adjacent units engage through a double-wall interlock with two independent EPDM gaskets. Water that passes the outer gasket is collected in a pressure-equalised chamber and drained at each floor line, so a single failed seal does not become an interior leak.
03
Movement, tolerance and drift
Vertical joints at every floor absorb slab deflection; horizontal joints accommodate inter-storey drift. In seismic regions the interlock engagement is sized to the calculated drift and verified on the mock-up rather than assumed.
04
Anchorage and adjustment
Cast-in channels are preferred; adjustable steel brackets are used where the structure is already poured. Brackets give ±20 mm adjustment in three axes, so the facade plane can be corrected after the slab edges are surveyed.
Finishes
PVDF or anodized?
Both are factory-applied and both last decades. The choice is usually decided by colour range and by what the specification in your market recognises.
| Property | PVDF (70% KYNAR 500) | Anodized |
|---|---|---|
| Film build | 25–35 µm, 2- or 3-coat system | 15–25 µm, integral anodic layer |
| Colour range | Full RAL / NCS range, metallics, mica, wood-grain | Natural silver, champagne, bronze, black (limited) |
| Weathering | AAMA 2605 / EN 12206, 10-year Florida exposure | Excellent — the surface is not a coating |
| Colour stability | ΔE ≤ 5 after 10 years, standard colours | No coating to fade; colour is in the metal |
| Impact / abrasion | Good; touch-up possible on site | Very good; scratches are difficult to repair |
| Best suited to | Facades, panels, coastal and high-UV exposure | Interiors, entrance frames, exposed metallic look |
| Warranty | 20–30 years, project-specific | 10–15 years |
Powder coating is available as a third option for interior and low-exposure applications. For coastal projects we default to a 3-coat PVDF build at 35 µm minimum.
Downloads
Documents for your submission
Files are released per project so that the correct profile family and revision reaches your consultant. Request the set and we will send it with the quotation.
Where it is used
Typical applications
FAQ
Questions about this system
If your question is about a specific elevation, send it with the drawing — the answer is usually in the geometry.
How is a unitized system different from a stick system?
What lead time should we plan for?
Can you work to our shop drawings or BIM model?
Unitized Curtain Wall
Send the elevation — we will price the package
Include the building height, the wind region and the glazing specification if you have it. We reply with a preliminary panel schedule, the applicable test reports and a quotation.