Home / Products / Multi-Storey Steel Buildings / Floor & Access Systems / Profiled Steel Decking
Profiled Steel Decking
Profiled steel decking for composite floors in multi-storey steel buildings: open-rib or closed-rib profiles as the design specifies, delivered with edge trims, closures and headed shear studs to the layout on the floor drawings. Detailed with the floor beams so the composite floor is built as designed.
Composite decking acts as permanent formwork during the pour and as tensile reinforcement once the slab has cured. The profile, gauge and span follow the composite design; we detail the deck layout with the floor beams so stud positions, edge trims and openings are on one set of drawings.
Headed shear studs are supplied to the stud layout and shop-welded to the beams where the sequence allows, which gives a more consistent weld than site-welding through the deck. Edge trims, closures and fixings are kitted per floor.
Part of Floor & Access Systems in Multi-Storey Steel Buildings . Other components in this sub-system: Truss Floor Decks · Steel Gratings · Welded Steel Stairs
Technical Specifications
| Item | Specification |
|---|---|
| Design basis | EN 1994-1-1 / AISC 360 Chapter I (composite floors) |
| Material | Galvanised strip to ASTM A653 or the EN equivalent |
| Profile | Open-rib or closed-rib, gauge and span per the composite design |
| Shear studs | Headed studs to EN ISO 13918 / AWS D1.1, layout per the floor drawings |
| Accessories | Edge trims, closures and fixings kitted per floor |
| Documentation | Material certificates and deck layout drawings with every shipment |
Section sizes, grades and quantities for this product are issued with the quotation once your design basis and loads are received.
Advantages vs Engineering Considerations
| Advantages | Engineering Considerations |
|---|---|
| Detailed with the beamsDeck layout, stud positions and edge trims are drawn with the floor beams, not added after the steel is cut. | Floor systems such as decking and composite slabs add wet trades and curing time compared with a single-storey frame. |
| Studs shop-welded where possibleShear studs are welded to the beams in the shop where the erection sequence allows. | Vibration and deflection limits of long floor spans often govern member sizes more than strength. |
| Kitted per floorDecking, trims, closures and fixings are bundled per floor so the concrete crew is not waiting on parts. | Fire protection to the steel frame is usually required by local code and must be priced in. |
| Galvanised stripFormed from galvanised strip to ASTM A653 or the EN equivalent with the coating class on the certificate. | Column grids are fixed at design stage; re-planning large openings later needs transfer structures. |
Certifications & Compliance
Every shipment leaves with the documents an auditor asks for. Scroll the row and open any certificate at full size.
China Steel Structure Manufacturing Grade I
AISC Certification
CE Marking – EN 1090-2 (CPR 01627)
OTC Document of Validity
International Welder Certification
Enterprise Qualifications Portfolio
DG Packaging Certificate
Labor & Scaffolding Contracting
Explosion-Proof Certificate
Industrial Pipeline Installation GC1
Power Facility License
Have drawings or a BOQ ready? Send them through the form and our engineers reply with a preliminary assessment.
Related Projects
Steel structures we fabricated and shipped for the same kind of building.
SynJect. Scale. Precision. Certainty.
SYNJECT delivers comprehensive steel structure solutions engineered for the global value chain. From investors seeking ROI to engineers demanding exact compliance, we transform complex blueprints into robust realities—on time and without friction.
SynJect ENGINEERING
From Microns to Megastructures — 12 Rigorous Stages Certified to AISC & EN 1090
Detailed Engineering & Shop Drawing Development
Utilizing advanced BIM platforms such as Tekla Structures, detailed 3D modeling and shop drawings are executed strictly in compliance with AISC 360 or Eurocode 3 (EN 1993). Connection designs are rigorously verified, with manufacturing drawings generated to ISO 2768-m tolerance standards. 100% clash detection with primary architectural and MEP systems is performed to ensure zero structural conflicts during field erection.
Nesting & Material Optimization
Intelligent nesting layouts are performed using advanced software like FastCAM/SigmaNEST in accordance with EN 10029 / ASTM A6 dimensional standards. Accounting for cutting kerf (2mm-5mm depending on plate thickness) and thermal contraction allowances, raw material utilization exceeds 92%. Offcuts are digitally barcode-tracked to ensure 100% mill test report (MTR) traceability.
Raw Material Incoming Inspection
All structural steel (Q355B/C/D, ASTM A572 Gr.50, S355JR/J2) must be accompanied by EN 10204 3.1 Mill Test Reports (MTR). Incoming quality control conducts 100% dimensional and visual inspections under ASTM A6 / EN 10029, verifying thickness tolerances (Class A/B) and internal lamination integrity via Ultrasonic Testing (UT) to ASTM A435. Chemical composition and mechanical properties are spot-verified by accredited 3rd-party labs.
CNC Cutting & Edge Preparation
Plate profiling and component cutting are executed via CNC oxy-fuel, high-definition plasma, and multi-kW fiber laser equipment. Cut surface quality strictly complies with EN ISO 9013 for perpendicularity and surface roughness (Range 3/4 tolerance). Multi-axis CNC beveling machines execute weld prep bevel angles within ±2.5° and root face dimensions within ±1.0 mm.
Primary Structural Welding
Welding is performed exclusively by AWS D1.1 or EN ISO 9606 certified welders using qualified Welding Procedure Specifications (WPS) supported by Procedure Qualification Records (PQR) per AWS D1.1 / ISO 15614. Submerged Arc Welding (SAW) and Flux-Cored Arc Welding (FCAW) dominate Complete Joint Penetration (CJP) and fillet welds. Heat input is strictly controlled, achieving weld quality levels conforming to ISO 5817 Quality Level B or AWS D1.1 standards.
Weld Distortion Straightening
Post-weld angular distortion, camber, and sweep are rectified using automated hydraulic flange straighteners and controlled thermal flame straightening. Heating temperatures for High-Strength Low-Alloy (HSLA) steels are strictly maintained between 600-650 Celsius (air-cooled, zero water quenching) to prevent microstructural degradation. Post-straightening straightness tolerances meet ±3 mm, conforming to EN 1090-2 Execution Class 2 (EXC2) and AISC COSP standards.
Non-Destructive Testing (NDT)
NDT protocols are operated by ISO 9712 / ASNT Level II certified NDT personnel. 100% of critical Complete Joint Penetration (CJP) welds undergo Ultrasonic Testing (UT per ISO 17640 / ASTM E164) or Magnetic Particle Testing (MT per ISO 17638 / ASTM E709). Radiographic Testing (RT) is applied as requested for heavy sections. Weld acceptance conforms strictly to ISO 11666 Acceptance Level 1 or AWS D1.1 criteria.
Trial Assembly & Shop Alignment
Complex geometries, long-span trusses, and heavy framing undergo 1:1 physical trial assembly or high-precision 3D laser scanning virtual assembly per EN 1090-2 / AISC requirements. Bolt hole alignment is verified (≥95% free-pass rate for high-strength bolts), and critical dimensions (span, camber, 3D spatial alignment) are verified within tight tolerance limits (±2.0 mm) to eliminate site fitting risks.
Surface Preparation & Protective Coating
Structural members undergo automated shot blasting to achieve SSPC-SP10 / NACE No. 2 / ISO 8501-1 Sa 2.5 cleanliness, with a surface profile (anchor depth) of 45-75 microns. High-performance protective coatings are applied using airless spray technology in compliance with ISO 12944 (C3 to CX corrosive environments), featuring Zinc-Rich Epoxy Primers, Epoxy Micaceous Iron Oxide Intermediate coats, and Polyurethane/Fluorocarbon Topcoats. Dry Film Thickness (DFT) is verified adhering strictly to the 90/10 rule.
Final Quality Inspection & Certification
Final Quality Control (FQC) performs a comprehensive audit, inspecting paint aesthetics (zero runs, pinholes, sagging), critical geometry, bolt hole pitches, and component mark traceability. A complete Manufacturing Data Report (MDR) comprising MTRs, NDT records, coating inspection logs, and Certificates of Conformance is compiled to support CE Marking (DoP under EN 1090) and AISC final acceptance.
Export Packaging & Logistics Protection
Protective packaging is engineered for containerized (40HQ/OT/FR) and breakbulk ocean freight under heavy maritime transit conditions. Structural members are bundled on heavy-duty steel skids with high-tensile steel strapping. Machined connections are wrapped with VCI anti-corrosion film, EPE foam padding, and heavy rubber cushions. All timber packing complies fully with ISPM 15 phytosanitary standards and IMO Cargo Stowage and Securing (CSS) rules.
Global Field Erection & Site Management
We deliver international site erection supervision and turnkey EPCM construction services adhering to OSHA 1926 safety protocols, AISC COSP, and EN 1090-2 erection standards. Field teams, led by multilingual HSE and QA/QC engineers, utilize high-precision total stations to maintain structural plumbness within H/1000 (25mm max). High-Strength Structural Bolting is executed via calibrated Wrench or Turn-of-Nut methods with 100% torque audit documentation.
Frequently Asked Questions
Do you supply composite decking with the shear studs?
Yes — profiled decking and headed shear studs are quoted together, with the stud layout following the composite design to EN 1994-1-1 or AISC 360. Studs are shop-welded where the sequence allows, which gives a more consistent weld than site-welding through decking.
Open-rib or closed-rib — which do you recommend?
The composite design decides it: closed-rib profiles suit exposed soffits and services fixed to the deck; open-rib profiles are the common choice for concealed floors. Send the floor design and we supply the profile it names.
Can the decking span without propping?
Unpropped span depends on profile, gauge and slab depth. Where the composite design needs longer unpropped spans, truss floor decks are quoted instead — see the Floor & Access Systems sub-system.
How is decking packed?
Sheets are cut to the floor layout, bundled per floor with edge protection and strapped for ocean transit, with the stud and fixing kit in the same consignment.
Do you supply decking for a frame we did not fabricate?
Yes. Send the beam layout, beam flange widths and the composite design; the deck layout and stud schedule are detailed to them.
Can you supply this sub-system on its own, without the full frame?
Yes. We quote sub-systems separately where the scope makes sense — for example secondary framing or bracing against an existing structure. Send the BOQ and connection details of the receiving structure so the interfaces are engineered rather than assumed.
Which design code do you fabricate to?
Whichever your design specifies. Design intent to AISC 360 or Eurocode 3 (EN 1993), execution to EN 1090-2 EXC2 under certificate 2787-CPR-01627.
Do you substitute section sizes or grades?
Never without written approval. If a specified section has a long lead time we propose the alternative with the calculation showing equivalence, and you decide.
What documentation ships with these components?
Mill test certificates per heat, WPS/PQR, welder qualification certificates, NDT reports with technician level, and coating thickness records against the specified ISO 12944 system.
What is a realistic lead time?
The standard cycle for a single-building scope is 40 to 50 days: 1–2 weeks to shop drawings for your approval, then 4–5 weeks for procurement, fabrication, coating and loading.
Send Us Your Drawings or BOQ
Tell us the footprint, span, crane capacity and local loads — our engineering team reviews every request and replies with a preliminary assessment.
- Reviewed by our engineering team
- AISC certified · CE marked EN 1090-2 (EXC2)
- Mutual NDA available on request
🔒 100% Private and Secure, No Spam