CE • EN 1090-2 S350GD Cold-Formed Steel & Passive House Building Envelopes
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Steel Grade
S350GD + Z275
Yield Strength
350 MPa (N/mm²)
Zinc Coating
275 g/m² (Çift Yüzey)
Roll-Form Tolerance
±0.5 mm
Seismic Factor
q = 2.5 - 3.5 (Sünek)
Service Holes
Fabrikasyon 32 mm
EN 1993-1-3 (Eurocode 3) & S350GD+Z275 Galvanized Steel

Steel frame design | SerVilla

The structural brief should identify the destination, site conditions, architectural geometry and the applicable design route.

Engineering Drawing & Physical Cross-Section
CAD/CAM Scale 1:1 Reference
S350GD+Z275 LIGHT GAUGE STEEL C140 STUD SECTION & CNC ROLL-FORM GEOMETRY EN 1993-1-3 Eurocode 3 • Factory Service Holes • Dimple Countersunk Geometry 140 mm (Web) 45 mm 12 mm (Lip) Ø32 mm CNC Service Hole Countersunk Dimple Screw Seat STRUCTURAL ATTRIBUTES & TOLERANCES Çelik Kalitesi: S350GD+Z275 (Çift Yüzey 275 g/m² Çinko) Profil Et Kalınlığı: 1.20 - 2.00 mm Yapısal Galvaniz CNC Boy Kesim Toleransı: ±0.5 mm (Sıfır Şantiye Firesi) Kuru Montaj Sistemi: Özel flanşlı vidalar (Sıfır Kaynak) Deprem Sünekliği: Eurocode 8 q = 2.5 - 3.5 (Ultra Güvenli)
LIVE SIMULATOR

Cold-Formed Steel Structural & Tonnage Simulator

ISO / EN Compliant Math

Simulate cold-formed steel framing tonnage, foundation load reduction vs reinforced concrete, and seismic ductility factors based on floors and floor area.

Total CFS Tonnage
6.64 t
~41.5 kg/m²
Foundation Load Relief
%89 Lighter
vs Reinforced Concrete
Seismic Behavior (q)
q = 3.0
Eurocode 8 DCH (Ductile)
CNC Production Time
5 Work Days
±0.5 mm Roll-Form

Technical Specifications & International Standards

Design criteria verified against Eurocode, ISO and DIN standards.

Verified Assembly
Engineering Parameter Design Value / Specification Standard Reference SerVilla Advantage
Structural Framing System C90, C140, C250 & U-Track (1.20 - 2.00 mm); C250 joists or 30 cm C90/C140 open-web trusses for floors EN 10346 / EN 10162 / EN 1993-1-3 Precision CAD/CAM roll-forming; up to 8 m column-free spans and zero on-site waste
Corrosion Resistance & Lifespan Z275 zinc galvanization (100+ years in dry insulated envelope) ISO 9223 / ISO 12944 (Class C1-C2) 100% immune to rot, termites and moisture damage
Structural Design Methodology Direct Strength Method (DSM) & Finite Element Method (FEM) Eurocode 3 Part 1-3 & Eurocode 8 (EN 1998-1) 3D FEA calculated for site-specific wind & snow
Connection Detailing Self-drilling structural screws (Hex/Wafer), M12-M16 chemical anchors EN 14566 / EOTA EAD 330232 Zero on-site welding preserves zinc barrier
Dimensional Stability Linear thermal expansion: 12 x 10⁻⁶ K⁻¹ (Zero twisting/warping) EN 10020 / ISO 6892 No warping, shrinkage or drywall cracking over decades
Acoustic Decoupling EPDM / Elastomeric acoustic base strip (Vibration damping) ISO 717-1 / EN 12354 Eliminates structure-borne flanking noise
PHYSICS PROOF

Eurocode 3 & 8 Structural Buckling & Seismic Load Mathematics

$$ V_b = \frac{S_d(T) \cdot W}{g} \cdot \frac{1}{q} \quad , \quad N_{b,Rd} = \frac{\chi \cdot A_{eff} \cdot f_y}{\gamma_{M1}} $$

A 160 m² two-storey SerVilla light steel villa weighs approximately 18 tonnes (versus 160-200 tonnes in reinforced concrete). Because earthquake base shear (Vb) is directly proportional to mass (W), the CFS frame experiences over 80-90% lower seismic inertial forces. Effective cross-sectional area (Aeff) and buckling reduction factor (χ) calculated to Eurocode 3 Part 1-3 guarantee structural stability at 350 MPa yield stress.

Failure Mode Analysis: Conventional Errors vs SerVilla Mitigation

Comparative building physics study showing failure points avoided by SerVilla design.

RISK MITIGATION
Warping, Twisting and Dimensional Drift in Timber or Sub-Grade Studs EN 10346 / DIN EN 1993-1-3
Conventional Failure Risk

Ruptured airtightness tapes, finishing cracks, jamming door and window joinery.

SerVilla Engineering Solution

SerVilla S350GD high-tensile structural steel with precision roll-forming eliminates shrinkage and warping with ±0.5 mm tolerance.

On-Site Cutting Inaccuracies and Unapproved Web Penetrations EN 1090-2 EXC2
Conventional Failure Risk

Structural capacity loss, web crippling, and burn-off of protective galvanizing layer.

SerVilla Engineering Solution

All service punchings (32mm) and fastener pilot holes are CAD/CAM pre-punched in factory; no hot works on site.

Premature Corrosion from Insufficient Zinc Coating ISO 12944-2 C1/C2
Conventional Failure Risk

Low-grade Z100-Z140 galvanizing degrades within 15-20 years in humid environments, reducing structural integrity.

SerVilla Engineering Solution

Mandatory Z275 (275 g/m² hot-dip continuous zinc) coating ensuring 100+ years service life in conditioned wall cavities.

BIM LEVEL 2 / OPENBIM SPECIFICATION

BIM Specification & Structural Data Sheet

IFC 4 / ISO 16739-1
IFC Data Schema
IFC 4 Design Transfer View (Structural Analysis)
Fire Reaction Class
REI 90 (Double Layer Type F Gypsum & Mineral Wool)
Acoustic Sound Index
Rw 56 dB / Ln,w <= 48 dB
Durability & Lifetime
Class C1/C2 Indoor (100+ Years Lifetime)
CE Declaration of Performance
DoP No: SV-CFS-2026-EU / EN 1090-1 CE Marking
Material Specification
Hot-Dip Galvanized Structural Steel S350GD+Z275-M-A-C

Governing Standards & Eurocode Norms

S350GD+Z275 galvanized framing delivers a 100+ year maintenance-free structural lifecycle per Eurocode 3.

EN 1993-1-3 EN 10346 EN 1998-1 EN 1090-2 (CE)
Passive House / Passivhaus KfW / Effizienzhaus 40–55 Minergie, Minergie-P, Minergie-A and ECO RE2020

4-Stage Process: From CNC Roll-Forming to Site Assembly

01

3D Structural & BIM Modeling

Architectural drawings converted into 3D light steel studs with pre-located MEP service holes and bolt coordinates.

02

CNC Roll-Forming & Inkjet Coding

Structural coils roll-formed, cut to ±0.5 mm tolerance, dimpled and inkjet-stamped with unique part numbers.

03

Flat-Pack Compact Logistics

Grouped by wall panels and roof trusses. Complete 160-220 m² two-storey villa structure fits into a single mega truck.

04

5-10 Days Dry Assembly

Zero welding or mortar. Erected with cordless impact drivers by 3-4 installers in 5-10 days under supervision.

5-Point On-Site Quality Assurance Checklist

1
Raw Material Galvanization Verification: Zinc mass tested to 275 g/m² using electromagnetic gauges on S350GD coils.
2
Roll-Form Dimensional Tolerance: Continuous caliper verification of member lengths (±0.5 mm) and flange squareness.
3
Pre-Punched Service Hole Check: Flanged 32 mm MEP service holes inspected for smooth de-burred edges.
4
Concrete Anchor Torque Audit: M12-M16 chemical foundation anchors verified with calibrated torque wrenches.
5
Zero On-Site Welding Policy: Strict confirmation that all connections are mechanically fastened without heat damage.

1. Structural Cold-Formed Steel Engineering Principles

SerVilla structural framing utilizes prime certified S350GD+Z275 hot-dip galvanized structural steel with a guaranteed minimum yield strength of 350 MPa (N/mm²]. Roll-formed via computerized CAD/CAM continuous profiling mills to within ±0.5 mm dimensional tolerances, the C90, C140 and C250 profiles alongside 30 cm open-web lattice floor trusses (engineered from C90 & C140 profiles] constitute the primary gravity and lateral load-resisting system.

Structural Verification to European Codes

  • Eurocode 3 (EN 1993-1-3 & EN 1993-1-5]: Design of cold-formed thin-gauge members and sheet connections. Elastic local, distortional and global flexural-torsional buckling modes are analyzed using the Direct Strength Method (DSM] and 3D FEA frame modeling.
  • Eurocode 8 (EN 1998-1]: Earthquake resistant design. The lightweight nature of the superstructure (80-120 kg/m² dead weight] coupled with high ductility (behavior factor q = 2.5 - 3.5] reduces seismic base shear by over 80% relative to concrete structures.
  • Environmental Loading: Wind speeds and ground snow loads are calculated site-specifically in strict compliance with Eurocode 1 (EN 1991-1-3 and EN 1991-1-4].

Intermediate Floor Framing & Joist Engineering

Intermediate floor structures in SerVilla cold-formed steel homes are engineered using two high-performance structural systems tailored to project spans and MEP integration:

  1. C250 mm Solid Roll-Form Joists: Continuous C250 mm depth cold-formed steel joists roll-formed to precise tolerances, providing high bending stiffness and fast assembly for standard spans.
  2. 30 cm (300 mm] Open-Web Lattice Trusses (Engineered from C90 & C140 Profiles]: Precision-engineered lattice floor trusses fabricated using C90 mm and C140 mm structural steel profiles.
  • Clear Spans up to 8.5 Meters: Eliminates intermediate load-bearing columns and interior load-bearing walls, enabling expansive, unobstructed living spaces.
  • Seamless MEP & MVHR Duct Routing: The open-web lattice geometry allows heat-recovery ventilation (MVHR] spiral ducting, plumbing, and electrical conduits to pass horizontally within the 30 cm floor depth without cutting or notching structural members.
  • Acoustic and Deflection Superiority: Combined with acoustic rockwool batts and decoupled dry/wet screed layers, floor assemblies achieve high structural dampening and minimal impact noise transmission (L'n,w < 43 dB].

Corrosion Immunity & 100-Year Structural Lifespan

All framing studs, joists and trusses receive a hot-dip Z275 zinc coating (275 g/m² combined mass]. Enclosed within a continuously insulated and vapor-controlled thermal envelope, framing operates under microclimate dry exposure (Class C1/C2 to ISO 9223]. Annual zinc degradation remains below 0.1 µm, delivering verified maintenance-free structural stability exceeding 100 years. On-site welding is entirely eliminated to keep galvanization intact.

SerVilla Engineering Note: Details documented in this specification are engineered project-specifically based on local soil conditions, statutory climate data, wind/snow loads and chosen energy targets (PHI, KfW 40, Minergie). Certified execution drawings govern contracts.

Explore Other Building Physics Modules

Wall Build-Ups & Cavity Thermal Bridge Elimination Airtightness & Membranes Triple Glazing & Shading Roof & Foundation Interface MVHR Ventilation & Heat Pumps PHPP & Blower Door Testing

Consult Our Engineering Desk on This Technical Assembly

Receive preliminary thermal bridging calculations and structural CFS advice directly from our senior engineering team.

Consult via WhatsApp

Explore Other Model Concepts

Compare alternative footprints, storey options and spatial arrangements.

Important Note: Veranda, garage, terrace, pool, BASEMENT FLOOR, etc. are NOT included in areas & PRICES. Semi-detached / twin models: 1 unit basis.
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Model 25-1004 American Style

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Model 25-1004 — 114 m², 1 storey

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Model 25-1005 — 135 m², 1 storey

Model 25-1005 • 135 m²

Model 25-1005 — 135 m², 1 storey

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Frequently Asked Questions

Essential answers regarding steel construction, energy targets and project delivery.

No. SerVilla structural framing utilizes S350GD structural steel hot-dip galvanized with Z275 (275 g/m² zinc) in compliance with EN 10346. Enclosed within a continuously insulated and vapor-controlled envelope, the framing operates in a permanently dry climate class (C1/C2), providing a certified service life exceeding 100 years.

Light steel framing offers exceptional seismic safety. Weighing only 80-120 kg/m²—roughly 90% lighter than reinforced concrete—it experiences dramatically reduced inertial earthquake forces (F = m · a). The ductile screw-fastened shear walls absorb seismic energy through controlled micro-deformation without sudden structural collapse.

Strictly no. On-site welding is prohibited in SerVilla engineering because high temperatures destroy the protective zinc galvanization layer. All connections are 100% mechanically assembled using precision pre-punched CNC dimples, structural self-drilling screws and certified chemical concrete anchors.

No. The steel studs are placed at 600 mm structural centerlines rather than forming a solid metal sheet or continuous Faraday enclosure. Radio frequencies, mobile 4G/5G signals and internal Wi-Fi pass effortlessly through glazing, door openings and drywall cavities.

Steel is non-combustible (Euroclass A1). Structural fire resistance is achieved by pairing the CFS frame with non-combustible rockwool cavity batts (A1) and fire-rated gypsum linings (Type F). The resulting composite wall achieves certified fire resistance ratings from REI 60 up to REI 90 to EN 13501-2.

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