Temporary structure safety: what every event professional needs to know

Safety is not optional when it comes to temporary demountable structures (TDS). For event organisers, venue operators, and contractors, structural integrity is a quantifiable engineering requirement rather than a subjective judgment. Understanding the principles that govern stability, anchoring, and load resistance is essential to meeting legal obligations and mitigating operational risk.

Core safety principles: loadings, anchoring, and wind ratings

The safety of any temporary structure depends on its ability to resist three primary forces:

• Vertical loads: The weight of the structure itself, ballast, flooring, plus equipment, lighting, AV, or people inside.
• Uplift: Forces caused by wind attempting to lift the structure.
• Slide: Lateral forces pushing the structure sideways under wind pressure.

Wind ratings

UK and EU context
BS EN 13782 defines design, calculation, and installation requirements for temporary structures. A compliant supplier will specify the maximum gust speed a structure can safely resist, which typically ranges from  35 to 55 mph depending on structure type, size, and configuration.

US context
In the United States, wind design is informed by ASCE 7, which provides regional wind speed data. Compliance with the International Building Code (IBC) and local amendments ensures structures are rated for expected environmental conditions. Professional suppliers will provide documented calculations to show the structure meets or exceeds these design requirements.

Anchoring

Anchorage can be achieved through ground stakes or weighted ballast. In all cases, the anchoring system must meet or exceed calculated combined uplift & Slide forces.

UK guidance
IStructE emphasises that ground conditions can vary significantly even within a single site. Pull-out tests or mathematically verified ballast weights are required; estimates or assumptions are insufficient for compliance.

US guidance
Similarly, US best practice requires documented verification of anchoring strength relative to design wind loads, often referenced against ASCE 7 calculations. Ballast or stake specifications must match the expected environmental forces at the site.

Method statements and risk assessments (RAMS)

Site-specific Method Statements and Risk Assessments (SSRA) form the operational blueprint for safe installation and dismantling. Generic documents are insufficient.

A robust Method Statement details the assembly sequence, ensuring stability during critical phases. A Risk Assessment identifies site-specific hazards such as overhead power lines, underground utilities, pedestrian proximity, and vehicle access points.

UK context
Under CDM 2015, these documents are integral to the Health and Safety File, providing a transparent record of risk management and mitigation measures.

US context
In the US, similar expectations are outlined by OSHA, local authorities, and the Event Safety Alliance. SSRA-equivalent documentation is often required for permit approval or inspection and serves as the basis for operational compliance during events.

Responsibility: Who manages safety on site?

Safety is a shared responsibility between organisers (clients) and suppliers (contractors).

• The Organiser is responsible for providing accurate site information, specifying requirements, and ensuring the contractor is competent.
• The Supplier is responsible for structural integrity and crew safety during installation. Once a structure is handed over, responsibility for operational safety—including monitoring wind speeds, occupancy limits, and emergency procedures—shifts to the event management team. The supplier typically provides a Wind Management Plan to guide ongoing operations.

UK reference
Health and Safety Executive – Temporary Demountable Structures Guidance

US reference
Event Safety Alliance – Event Safety Guide, IBC Chapter 31, ANSI E1.21

By integrating these practices, organisers in the UK, US, and internationally can manage the inherent risks of temporary structures while ensuring legal compliance and operational continuity.

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