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Roof Panels
Roof panels for steel buildings: single-skin profiled sheets and insulated sandwich panels cut to length per roof plane, supplied with the panel maker’s declaration of performance for the profile or sandwich panel type. Supplied with flashings, fixings and sealants kitted against the same bundle numbers.
Roof panels are selected against the support condition and the performance the building needs: purlin spacing, span, wind uplift, required U-value and fire reaction class. Sandwich panels carry the insulation and the weather skin in one component with a declared U-value; single skin plus separate insulation is cheaper per square metre but needs a liner and vapour control layer.
Sheets are cut to the site schedule per roof plane and bundled per plane with strippable film, edge protection and interleaving, so the installation crew opens one bundle per face. Flashings, fixings and sealants are kitted against the same bundle numbers.
Part of Roof & Wall Cladding in Enclosure & Cladding Systems . Other components in this sub-system: Wall Panels · FRP/PC Skylight Panels · Glass Curtain Walls
Technical Specifications
| Item | Specification |
|---|---|
| Product standard | Panel maker’s declaration for the profile or sandwich panel type in the build-up |
| Performance declaration | Panel maker’s declaration of performance: U-value, fire reaction class, watertightness |
| Coating | Coil coating class stated on the certificate; ISO 12944 category for the site environment |
| Cutting | Cut to length per roof plane to the site schedule |
| Accessories | Flashings, fixings and sealants kitted per bundle |
| Documentation | Maker’s performance declaration, material certificates, coating thickness records and installation details |
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 |
|---|---|
| Declared performanceEvery panel ships with its maker’s performance declaration — U-value, fire reaction and watertightness values you can hand to the inspector. | Panel performance depends on the purlin and girt spacing of the frame and on correct fixings. |
| Selected against the supportsProfile and thickness are chosen for the actual purlin spacing and wind uplift, not assumed. | Thermal and vapour design must suit the local climate; the wrong insulation build-up can lead to condensation. |
| Cut and kitted per planeSheets cut to the roof schedule and accessories kitted per bundle — less site waste, no short deliveries of flashings and fixings. | Doors, windows and ventilation need frame openings and trimmers detailed before fabrication. |
| Coating for the environmentCoil coating class and ISO 12944 category selected for the site conditions, stated on the material certificate. | Long panels and flashings are vulnerable in transport; packing and site handling need care. |
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
Can you supply panels only, without the purlins or frame?
Yes. Send the purlin or girt spacing, span and fixing details so panel thickness and profile are selected against the actual support condition rather than assumed. Panels specified without the support spacing is the most common cause of deflection complaints.
Single-skin or sandwich panel — how do we choose?
Sandwich panels carry the insulation and the weather skin in one component, which is faster and gives a declared U-value. Single skin plus separate insulation is cheaper per m² but needs a liner and vapour control layer. State the required U-value and fire class and we quote the build-up that meets it.
Which coating class should we specify?
It follows the site environment: ISO 12944 C3 for most inland industrial sites, C4–C5 near industry or coast, CX for offshore and heavy chemical exposure. Give us the location and we propose the coil coating class.
How are sheets cut and delivered?
Cut to your site schedule per building elevation, bundled by elevation and kitted with the matching flashings, fixings and sealants. This removes site cutting waste and stops accessory shortages.
Do roof panels carry the EN 1090-2 certificate?
No, and we do not claim it for them. Roof panels ship with their maker’s performance declaration; our EN 1090-2 EXC2 certificate covers the load-bearing steelwork.
What performance values do you declare for these products?
Each item carries its maker’s performance declaration — thermal transmittance and fire reaction class for insulation, watertightness and wind resistance for cladding and openings, flow capacity for rainwater goods. Tell us the required values and we quote products that meet them.
Can you supply the envelope without the steel frame?
Yes. We quote envelope packages against an existing or third-party structure — send the purlin or girt spacing, span and fixing details so the profile and thickness are selected correctly rather than assumed.
Which coating class should we specify?
It follows the site environment: ISO 12944 C3 for most inland industrial sites, C4–C5 near industry or coast, CX for offshore and heavy chemical exposure. Give us the location and we propose the coil coating class with the expected maintenance interval.
How are sheets cut and delivered?
Cut to your site schedule per building elevation, bundled by elevation and kitted with the matching flashings, fixings and sealants. This removes site cutting waste and stops accessory shortages.
What documentation ships with the materials?
Maker’s performance declaration per product, material certificates for the substrate and coating, coating thickness records, and installation details for the profiles supplied.
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
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