High-Strength Structural Steel Truss with Factory Pre-Assembly for Efficient Warehouse Roofing

Product Description

Our High-Strength Structural Steel Truss is purpose-built for warehouse roofing where speed, efficiency, and reliability are critical. Unlike conventional trusses that demand extensive on-site fabrication, our truss is factory pre-assembled—meaning the overwhelming majority of the work is completed in our controlled workshop before any component reaches your site.

The triangular lattice configuration of high-strength steel members delivers exceptional load-bearing capacity with minimal self-weight, enabling wide, column-free interior spans that maximise usable storage space—ideal for warehouses, distribution centres, and logistics facilities. Every truss arrives ready to erect, with all members pre-cut, pre-drilled, pre-welded, and clearly marked for rapid bolted assembly.

Why Pre-Assembly Matters – A Smarter Approach

Traditional truss projects rely heavily on on-site fabrication—cutting, welding, and assembling components in the field. This approach is slow, labour-intensive, and vulnerable to weather delays, quality variations, and safety risks.

Our approach is fundamentally different:

Conventional On-Site Fabrication	Our Factory Pre-Assembly
Cutting and welding performed in the field	All cutting, drilling, and welding completed in the workshop
Quality depends on site conditions and worker skill	Precision CNC equipment and controlled conditions ensure consistent quality
Weather delays common	Fabrication proceeds regardless of weather
Extensive on-site labour required	85–90% of the work is done before shipment
Trial assembly on-site (if at all)	Full 1:1 trial assembly in the factory before disassembly and packing
Rework and adjustments on-site common	Components fit perfectly—no field rework

The result is a dramatically faster, more predictable, and higher-quality roofing solution for your warehouse.

What You Gain – Core Benefits of Factory Pre-Assembly

Accelerated Project Timelines
With the majority of fabrication completed off-site while your foundations and site work proceed in parallel, you can reduce total project duration by up to 50%. On-site erection becomes a simple matter of bolting together pre-fitted components—a small crew can complete the roof structure in days rather than weeks.

Superior Quality Control
Shop fabrication under controlled conditions ensures dimensional accuracy and consistent quality that field fabrication cannot achieve. Every weld is performed by certified welders using approved procedures, and each truss undergoes full inspection before it leaves our facility.

Reduced On-Site Labour Costs
By moving the bulk of the work from the field to the factory, we significantly reduce on-site labour requirements. Your site team needs fewer workers for less time—lowering your labour costs and reducing on-site safety risks.

Eliminated Field Rework
Because every truss is trial-assembled at 1:1 scale in our workshop before shipment, we verify that all components fit perfectly. When your truss arrives on-site, there are no surprises, no adjustments, and no rework—just efficient assembly.

Minimised Weather Dependency
Fabrication in our workshop proceeds regardless of weather conditions. Rain, wind, or extreme temperatures do not delay your project—only the final bolting assembly happens on-site.

Structural Excellence – Engineered for Warehouse Demands

Warehouse roofing demands wide spans, high load capacity, and long-term durability. Our truss delivers on all three.

Column-Free Interiors
The triangular lattice configuration efficiently transfers loads through axial forces, enabling spans customised to your project without intermediate columns. This creates the open, unobstructed floor space that warehouses need for high-bay racking, material handling equipment, and efficient goods flow.

High Strength-to-Weight Ratio
High-strength structural steel delivers exceptional load capacity with minimal self-weight. This means lighter foundations, reduced steel consumption, and lower overall project costs compared to conventional beam-and-column systems.

Design Flexibility
We offer multiple truss configurations—Warren (zigzag diagonals for uniform loads), Pratt (diagonals slope toward centre for heavy loads), Howe (diagonals slope away for shorter spans), or custom lattice for tailored geometry. Our in-house engineering team uses Tekla Structures and STAAD Pro to model every truss, considering your specific span, roof slope, and load requirements.

Material Integrity – Certified Steel with Full Traceability

We manufacture our trusses from premium structural steel grades sourced from certified mills:

• Q355B (GB/T 1591) – the standard grade offering minimum yield strength of 355 MPa (≤16mm) with excellent weldability and low-temperature impact toughness. Fully equivalent to S355JR (EN 10025-2) .
• S355JR (EN 10025-2) – European standard grade for projects requiring EN compliance.
• ASTM A572 Gr.50 – American standard grade for projects requiring AISC compliance.
Every steel delivery includes complete Mill Test Certificates (MTCs) confirming chemical composition, mechanical properties, and heat numbers—ensuring full material traceability from mill to finished truss.

From Our Workshop to Your Site – The Pre-Assembly Workflow

Step 1: Precision Fabrication
All members are CNC cut to exact length and CNC drilled for bolt holes with positional accuracy. Welding is performed by certified welders using approved WPS (SMAW/GMAW/SAW). Components are assembled on dedicated jigs to maintain consistent geometry across all trusses.

Step 2: 1:1 Trial Assembly
Every truss is fully assembled in our workshop at full scale before any component is packed for shipment. This allows us to:

• Verify all dimensions and hole alignments
• Confirm that all members fit together perfectly
• Identify and correct any issues before shipment
• Document the assembly sequence for your site team
Step 3: Inspection & Testing

• Dimensional verification against shop drawings
• Visual inspection of all welds
• NDT (Ultrasonic Testing / Magnetic Particle) on critical joints as required
• Coating thickness verification using magnetic gauges
Step 4: Disassembly, Marking & Packing
The truss is carefully disassembled, and every member is clearly stencilled with a unique erection tag matching the assembly drawings. Components are packed in heavy-duty crates with edge protection and moisture barriers.

Step 5: On-Site Erection
Your site team receives a complete package: pre-cut, pre-drilled, pre-welded components, detailed erection drawings, and a step-by-step assembly sequence. Erection is simply a matter of bolting together marked pieces following the provided drawings.

Specification

Item	Detailed Description
Steel Material	Grades: Q355B (GB/T 1591) – yield ≥355 MPa (≤16mm) / ≥345 MPa (16-40mm); tensile 470-630 MPa; CEV ≤0.45%. Alternatives: S355JR (EN 10025-2), ASTM A572 Gr.50. Impact toughness: ≥34J at -20°C. Full MTCs with heat number traceability provided.
Pre-Assembly & Fabrication	Pre-assembly rate: Up to 85–90% shop-completed. Trial assembly: 1:1 full-scale assembly in workshop before disassembly. Fabrication: CNC cutting/drilling, jig-set assembly, welding by EN ISO 9606-1 certified welders. Tolerances: Length ±2mm; Straightness ≤L/1000; Hole centre ±1.5mm.
Truss Configuration	Types: Warren, Pratt, Howe, or custom lattice. Chord members: H-beams (up to 900mm depth), fabricated box sections. Web members: Angles, tubes, or channels. Thickness range: 6-40mm with stiffeners at supports and load points. All sections verified for local and global buckling per design code.
Design & Compliance	Design Codes: AISC 360, Eurocode 3 (EN 1993-1-1), or GB. Seismic: AISC 341 or Eurocode 8 available. Welding Standard: AWS D1.1 or EN 1090-2. Execution Class: EXC2 (standard) / EXC3 (request). Quality: ISO 9001.
Connection System	Shop connections: Full-penetration butt welds for chord splices; fillet welds for web-to-chord joints. Field connections: High-strength friction-grip bolts (Grade 8.8 or 10.9) – no field welding required. Gusset plates: 10-20mm thickness, bolt pattern per code for shear and bearing capacity. All bolt holes pre-drilled.
Corrosion Protection	Standard: Abrasive blast to Sa2.5 (ISO 8501-1) → Zinc-rich primer 75μm DFT → Epoxy/polyurethane topcoat, total DFT 120-160μm. Upgrade: Hot-dip galvanizing per EN ISO 1461, mean ≥85μm. Suitability: C2 to C5 corrosivity categories per ISO 12944.

All specifications are project-specific and fully customisable to your requirements.

Packaging & Shipping

We take every precaution to ensure your pre-assembled truss components arrive in perfect condition. Each member is individually stencilled with an erection tag matching the assembly drawings for error-free site sorting. Components are packed in heavy-duty steel-framed crates with foam padding or bundled with edge protection, then shrink-wrapped with VCI paper to prevent moisture ingress during sea freight. A complete packing list, lifting plan, erection sequence, and all quality certificates (MTCs, WPS/PQR, NDT reports) are included with every shipment. We arrange flat-rack or open-top containers for standard spans, with break-bulk shipping available for extra-long members.

After-Sales Service
Our commitment extends well beyond delivery. We provide detailed erection drawings with step-by-step assembly sequences, and on-site supervision is available upon request. A 12-month warranty covers material and workmanship. Our engineering team offers technical assistance within 24 hours of any post-shipment query. Full documentation—including Mill Test Certificates, NDT reports, and as-built drawings—is provided for your project file.

Company Profile

Hangzhou FAMOUS Steel Engineering Co., Ltd. (FASECbuilding) is a steel structure manufacturer specialising in factory pre-assembled trusses for warehouses and industrial facilities worldwide.

Our 50,000m² facility is equipped with CNC cutting, automatic welding, and precision assembly lines. An in-house engineering team proficient in Tekla Structures, STAAD Pro, and major design codes (AISC, Eurocode, GB) supports every project. We hold ISO 9001 certification and maintain full EN 1090 capability for European projects. With a global track record spanning Asia, Europe, the Americas, and the Middle East, we have delivered factory pre-assembled trusses for warehouses, distribution centres, and logistics facilities of all scales. Our stable production capacity reliably handles projects of any size with on-time delivery and consistent quality.

We deliver factory pre-assembled steel trusses that arrive ready to erect—saving you time, reducing on-site costs, and getting your warehouse operational sooner.