Project Overview
- Project Name: Vistula Corporate Campus - Tower A & B
- Project Type: Grade-A Commercial Office Complex
- Location: Warsaw Business District, Warsaw, Poland
- SGL Products: Aluminum thermally broken curtain wall, aluminum casement windows, RC3 steel entry doors, aluminum folding entrance systems
- Scale: 86,000 m² gross floor area, 22-story twin towers
- Completion: Q3 2025
- Client: Pan-European Real Estate Development Group
The Project
The Vistula Corporate Campus represents one of Warsaw's most ambitious commercial real estate developments of the decade - twin 22-story towers spanning 86,000 m² of Grade-A office space, connected by a 4-story retail and hospitality podium. Positioned on the Vistula riverfront, the project demanded a fenestration solution that could deliver the visual drama of a near-fully-glazed façade while meeting Poland's strict energy efficiency codes and the client's equally stringent security requirements.
SGL was selected through a competitive tender process over four European and two Asian manufacturers. The selection criteria weighted three factors equally: technical certification compliance (EN 1627, EN 1279 thermal), supply chain reliability across an 18-month delivery schedule, and post-installation technical support capability in the European market.
Client Challenges
Challenge 1: Thermal Compliance Under Polish Energy Regulations
Poland's WT 2021 (Warunki Techniczne 2021) regulations set maximum Uw values of 1.1 W/m²K for windows in commercial buildings and 1.3 W/m²K for curtain walls. With 72% glazed façades on the tower elevations, achieving these values required a thermally broken aluminum system capable of consistent factory-controlled U-value performance at scale.
Initial architectural specifications called for a floor-to-ceiling vision height of 2.85m per floor - requiring unitized curtain wall modules spanning full story heights with minimal visible sightlines.
Challenge 2: Security Specification for High-Profile Tenant Requirements
The development's anchor tenant - a multinational financial services corporation occupying floors 8–16 - specified EN 1627 RC3 minimum for all core access doors, with RC4 required for two dedicated server room and vault access points. Traditional commercial aluminum door systems could not meet RC3 at the required aperture sizes (900×2100mm double-leaf configurations).
Challenge 3: 18-Month Delivery Window with Zero Schedule Delay Tolerance
The development timeline was tied to a pre-agreed tenant occupation date carrying substantial financial penalties for delay. SGL was required to deliver in 14 batches over 18 months, synchronized with each floor's construction completion - meaning no batch could arrive early (limited on-site storage) or late (construction halt implications).
Challenge 4: Coastal-Equivalent Corrosion Environment
Warsaw's location in an industrial belt, combined with the project's proximity to river moisture and winter road salting, required corrosion performance equivalent to Category C4 (ISO 12944) - the classification typically applied to coastal industrial environments.
SGL Solution
System 1: Unitized Aluminum Curtain Wall (Tower Façades)
System specified: SGL UCW-3500 Unitized Curtain Wall System
| Parameter | Specification |
|---|---|
| Module dimension | 1,500mm × 2,850mm (floor-to-ceiling unit) |
| Frame material | AA6063-T5 aluminum, 2.0mm min wall thickness |
| Thermal break | 34mm polyamide thermal break (Ensinger Insulbar) |
| Glazing | Triple-glazed units: 6mm / 20mm argon / 4mm / 16mm argon / 6mm |
| Low-E coating | Guardian ClimaGuard Premium 2T (Ug = 0.5 W/m²K) |
| Uw (frame + glass) | 0.89 W/m²K (tested to EN ISO 10077-2) |
| Air permeability | Class 4 (EN 12207) |
| Water tightness | Class E1200 (EN 12208) |
| Wind resistance | Class C5 (EN 12210) - tested to +3.2 kPa / -4.8 kPa |
| Surface finish | Powder coat RAL 7016 Anthracite Grey, 80–100 micron, Qualicoat Class 2 |
| Corrosion rating | ISO 12944 C4 compliant |
Total curtain wall supply: 4,214 unitized modules covering 9,680 m² of façade area.
System 2: Aluminum Thermally Broken Windows (Podium & Internal Cores)
For the 4-story podium retail and office levels and all internal partition glazing, SGL supplied its AL-860TB casement and fixed window system:
- U-value: 1.08 W/m²K (with double glazing)
- Frame depth: 86mm with 28mm polyamide thermal break
- Opening configurations: Fixed, top-hung vent, parallel vent
- Glazing: 4/16argon/4 double glazed, Guardian SN72 Low-E
- Quantity: 847 window units across 11 configurations
System 3: Steel RC3 Security Entry Doors (Core & Server Room Access)
System specified: SGL Steel Security Door Series SD-RC3 and SD-RC4
| Parameter | RC3 Specification | RC4 Specification |
|---|---|---|
| Certification | EN 1627:2011 RC3 | EN 1627:2011 RC4 |
| Test laboratory | Institut für Fenstertechnik (ift) Rosenheim | ift Rosenheim |
| Door leaf thickness | 72mm | 84mm |
| Steel core | 3mm cold-rolled steel skin + honeycomb steel core | 4mm + reinforced steel frame |
| Lock system | 5-point multipoint Mul-T-Lock + motorized deadbolt | 7-point + Abloy Protec² |
| Hinge system | 5× anti-lift welded hinges | 7× reinforced welded |
| Frame | 100mm steel frame, 4mm wall | 120mm steel frame, 5mm wall |
| Aperture | 900×2100mm (single) / 1600×2100mm (double-leaf) | 900×2100mm |
| Finish | Powder coat RAL 7016 / 7021, C4 | As specified |
| Quantity | 164 units | 16 units |
System 4: Aluminum Folding Entrance Systems (Lobby)
The twin tower lobbies each required a 12-meter wide folding glass entrance wall - a showpiece architectural element requiring custom engineering:
- System: SGL Folding Door System FD-80
- Opening width: 12,000mm per tower
- Module: 9 panels × 1,333mm per tower
- Glass: 12mm toughened laminate (6+0.76PVB+6), clear
- Operation: Motorized (Dorma Agile 150) with manual override
- Frame: 80mm aluminum, powder coat RAL 9005
- Wind load certification: EN 12210 Class C2
Implementation Highlights
Factory-Level QA Integration
Given the project's scale, SGL implemented a dedicated quality assurance protocol mirroring the project's ISO 9001-compliant construction management system:
- Each curtain wall module was factory-tagged with a QR code linking to its test records, production date, glazing batch number, and powder coat batch reference
- Inspection reports were shared with the project's independent technical auditor (ITA) via shared BIM model integration
- Zero rework incidents were recorded across the 4,214-module supply - a result attributed to SGL's in-factory thermocycle testing of 2% of modules per batch
Phased Delivery Execution
| Delivery Batch | Content | Delivery Week | Construction Floor |
|---|---|---|---|
| Batch 1 | Podium entrance systems + RC4 doors | Week 4 | Podium Level 1 |
| Batch 2–3 | Tower A floors 1–6 curtain wall | Week 8–12 | Tower A L1–L6 |
| Batch 4–5 | Tower B floors 1–6 + core doors L1–8 | Week 14–18 | Tower B L1–L6 |
| Batch 6–10 | Tower A & B floors 7–16 | Week 20–36 | Mid-rise floors |
| Batch 11–14 | Floors 17–22 + snag inventory | Week 40–52 | Upper floors |
All 14 deliveries completed on schedule. Zero critical path delays attributable to SGL supply.
On-Site Technical Support
SGL deployed two resident technical advisors on-site from Week 4 through Week 54 to support:
- Unitized module installation guidance (SGL proprietary installation method)
- On-site glazing quality inspection
- Hardware commissioning for all 180 security doors
- Preparation of as-built documentation and O&M manuals
Project Results
| Performance Indicator | Target | Achieved |
|---|---|---|
| Uw curtain wall (tested in-situ) | ≤1.3 W/m²K | 0.91 W/m²K |
| Uw windows (tested in-situ) | ≤1.1 W/m²K | 1.05 W/m²K |
| Air permeability test (EN 13829) | Pass Class A | Class A - Pass |
| Water tightness test | No leaks at 600 Pa | No leaks at 900 Pa |
| Security door certification | RC3 all core doors | RC3 confirmed + RC4 vault |
| On-time delivery rate | 100% | 100% - all 14 batches |
| Installation defect rate | <0.5% modules | 0.11% (5 modules reworked) |
| BREEAM credit contribution | Credits for façade | 6 BREEAM credits contributed |
BREEAM Excellent Certification
The Vistula Corporate Campus achieved BREEAM Excellent at practical completion - the highest BREEAM rating awarded to a commercial development in Poland in 2025. SGL's façade systems contributed directly to 6 BREEAM credits across energy (Ene 01, Ene 04) and materials (Mat 01, Mat 03) categories, primarily through:
- High recycled content aluminum (73% recycled material)
- Demonstrated thermal performance reducing building energy demand by 23% vs. the WT 2021 reference case
- Qualicoat Class 2 powder coating eliminating VOC-emitting solvent finishes
Client Testimonial
"SGL's ability to engineer a curtain wall system meeting 0.89 W/m²K at the scale of two 22-story towers - while simultaneously delivering a certified RC3/RC4 steel door system - demonstrated technical breadth we hadn't seen from a single-source supplier. The phased delivery performance was frankly exceptional: 14 batches, zero critical delays, two resident technical advisors on-site throughout. This project has cemented SGL as our preferred fenestration supplier for our European pipeline."
- Head of Procurement, Pan-European Real Estate Development Group (name withheld per client request)
Key Success Factors
- Single-source supply: Coordinating curtain wall, windows, and security doors through a single supplier eliminated inter-system compatibility issues and simplified the project's supply chain management.
- Pre-certification at scale: SGL's RC3/RC4 steel door systems arrived pre-certified with ift Rosenheim test documentation - eliminating the need for on-site or third-party testing, which would have added 6–8 weeks to the security door program.
- BIM-integrated delivery management: Integration with the project's BIM model enabled floor-level delivery scheduling that matched construction sequencing, eliminating on-site storage constraints and protecting all modules from site damage.
- Resident technical advisory: Having SGL technical staff on-site throughout the installation phase reduced RFI (Request for Information) response time from the typical 3–5 day industry standard to same-day resolution, maintaining installation momentum.
About SGL Doors & Windows
SGL is a specialist manufacturer of aluminum, steel, and uPVC windows and doors for commercial and high-end residential projects globally. With production facilities certified to ISO 9001:2015 and a dedicated export team serving Europe, North America, the Middle East, and Central Asia, SGL supports projects from specification through post-installation technical service.
Interested in a similar project? Our commercial team provides:
- Technical specification support
- Certified system selection guidance
- Project-specific pricing within 5 business days
Related Products: SGL Curtain Wall Systems | SGL Steel Security Doors | SGL Aluminum Windows
Related Case Studies: Kazakhstan Residential Complex | High-Rise Window Solutions
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