Spigot Truss Stage Roof System: A Buyer's Guide to Specs, Loads, and Sourcing

August 13, 2026

When planning an outdoor event or a large indoor production, the stage roof is one of the most critical structural elements. A spigot truss stage roof system offers a modular, quick-to-assemble solution that is widely used for concerts, festivals, and corporate events. This guide explains the key specifications, load tables, and selection criteria you need to know as a professional buyer.

What Is a Spigot Truss Stage Roof System?

A spigot truss system uses a conical connector (the spigot) that slides into the end of an adjacent truss section, secured with a pin. This connection method is fast, requires no loose bolts, and allows for rapid assembly and disassembly—ideal for touring and temporary structures. A stage roof system typically consists of vertical support towers, horizontal roof trusses, and sometimes a canopy or roof sheet. The trusses are made from aluminum alloy, offering a high strength-to-weight ratio.

Key Components and Materials

All spigot truss sections in our range are fabricated from 6082/6061-T6 aluminum alloy. This material provides good weldability and high strength, making it suitable for load-bearing structures. The main tubes, sub tubes, and brace tubes are precision-welded to ensure consistent performance.

Here are the core truss profiles used in a stage roof system:

Ladder Truss (WRF-29): A flat truss with two main tubes and diagonal bracing. Often used as horizontal roof beams or as legs in smaller systems.
Triangle Truss (WRT-29): A triangular cross-section, offering good rigidity in one plane. Commonly used for roof spars or as a lightweight main beam.
Square Truss (WRS-29, WRS-30, WRS-40, WRS-4060, WRS-52): The most versatile profile, with four main tubes. Used for both roof and tower applications. Larger cross-sections (e.g., WRS-4060, WRS-52) provide higher load capacities for larger spans.
Spigot Lifting System: A dedicated system designed to lift and support the roof structure, ensuring safe and efficient height adjustment.

Understanding Load Tables

Load tables are provided for each truss profile, showing the maximum distributed load (kg/m) and point load (kg) for various spans. These figures are based on TÜV-tested data and are critical for system design. Always consult a structural engineer to ensure your configuration meets safety requirements.

Example Load Data (Excerpts)

WRF-29 Ladder Truss:

Span 1 m: 990 kg/m distributed, 990 kg point load
Span 3 m: 168 kg/m distributed, 115 kg point load
Span 6 m: 26 kg/m distributed, 10 kg point load

WRT-29 Triangle Truss:

Span 3 m: 371 kg/m distributed, 557 kg point load
Span 6 m: 109 kg/m distributed, 327 kg point load
Span 8 m: 67 kg/m distributed, 268 kg point load

WRS-29 Square Truss (29cm x 29cm):

Span 1 m: 1942 kg/m distributed, 1942 kg point load
Span 4 m: 488 kg/m distributed, 1466 kg point load
Span 6 m: 317 kg/m distributed, 948 kg point load

WRS-30 Square Truss (30cm x 30cm): Same load capacities as WRS-29.

WRS-40 Square Truss (40cm x 40cm):

Span 3 m: 936 kg/m distributed, 718 kg point load
Span 6 m: 320 kg/m distributed, 612 kg point load
Span 8 m: 176 kg/m distributed, 560 kg point load

WRS-4060 Square Truss (40cm x 60cm):

Span 4 m: 805 kg/m distributed, 1610 kg point load
Span 8 m: 247 kg/m distributed, 988 kg point load
Span 9 m: 210 kg/m distributed, 945 kg point load

WRS-52 Square Truss (52cm x 52cm):

Span 7 m: 460 kg/m distributed, 1255 kg point load
Span 10 m: 241 kg/m distributed, 923 kg point load
Span 12 m: 164 kg/m distributed, 782 kg point load

Note: Load values decrease as span increases. Always use the appropriate safety factor and consider dynamic loads (e.g., wind, movement) in your design.

Choosing the Right Truss for Your Stage Roof

Determine the Required Span and Load: Calculate the total weight of lighting, sound, and any hanging equipment. Choose a truss profile that can handle the load at the required span.
Consider the Roof Layout: For a rectangular roof, square trusses are often used for the main beams and perimeter. Triangle trusses can be used for lighter roof spars.
Tower Design: The vertical support towers must be designed to carry the roof loads and resist overturning. The spigot lifting system simplifies height adjustment.
Modularity and Transport: Spigot truss sections come in standard lengths (e.g., 50 cm to 400 cm) to allow flexible configurations and efficient packing.

Sourcing from a Factory-Direct Supplier

Buying directly from a factory in China can offer cost advantages and customization options. When evaluating a supplier, consider:

Certifications: Look for TÜV Rheinland certification and ISO 9001:2015 quality management. These indicate that the factory follows rigorous quality standards.
Load Test Data: Ensure the supplier provides detailed load tables for each truss profile. This data is essential for safe design.
Material Quality: Confirm that the aluminum alloy is 6082/6061-T6 and that welding is performed by certified welders.
Production Capability: A factory with in-house production can offer better lead times and quality control.

FAQ

Q: Can I use a spigot truss stage roof system for outdoor events? A: Yes, but you must account for wind loads and ensure the structure is properly anchored. The provided load tables are for static loads; dynamic loads require additional engineering.

Q: What is the difference between WRS-29 and WRS-30? A: The cross-section dimensions differ slightly (29 cm vs. 30 cm), but the load capacities are identical in our data. The choice may depend on compatibility with existing components.

Q: How do I know which truss profile to choose? A: Calculate your maximum span and load, then refer to the load tables. If you need a long span with high load, consider larger profiles like WRS-4060 or WRS-52.

Q: Are the load tables TÜV-tested? A: Yes, the load capacities provided are based on TÜV-tested data, ensuring reliable performance.

Conclusion

A spigot truss stage roof system is a reliable and efficient solution for temporary structures. By understanding the material specs, load tables, and selection criteria, you can make an informed purchase that meets your event's needs. For more details, explore the product pages: