Marquee stakes for clearspan structures — engineering the anchor load to the baseplate
Clearspan Structure Anchoring
Base plate anchoring guidance for site managers, installers, and structural engineers working clearspan jobs.
How Clearspan Anchoring Differs from Pole Marquee Anchoring
A clearspan marquee uses a rigid aluminium rafter-to-eave frame. There are no guy ropes. All loads from the structure transfer through the rigid frame to base plates at each leg. In a pole marquee, loads are distributed through guy ropes at angles around the perimeter. In a clearspan structure, all load at a given leg transfers through a single base plate to the stakes driven through it.
If those anchor points fail, the structural consequence is not a sagging canopy — it is loss of structural stability.
What the Baseplate Must Resist
Clearspan base plate anchoring must resist vertical uplift, lateral force, and overturning moment simultaneously. A stake driven vertically through a base plate provides good pull-out resistance against uplift but limited resistance to lateral force, which is why clearspan stakes are often driven at an angle through the base plate holes.
Pinning is the preferred method wherever ground conditions allow. Ballast is used where staking is not possible: car parks, heritage sites, venues with underground utilities, and hardstanding areas.
Stake Size Guide for Clearspan Structures
| Structure Width | Bay Length | Recommended Length | Diameter | Notes |
|---|---|---|---|---|
| Up to 10m wide | 3m–5m bays | 42" | 29mm | Soft to hard ground |
| 10m–20m wide | 3m–5m bays | 42"–60" | 29mm | High pull-out requirement or soft ground: 60"; very hard ground: 42"–48" at full depth + multi-stake where needed |
| 20m–35m wide | 5m bays | 60" | 29mm | Multi-stake per base plate where single stake pull-out resistance is insufficient or driving depth is limited |
| 35m+ wide | 5m+ bays | 60" + engineer sign-off | 29mm+ | Engineering pack mandatory |
Working to the Engineering Specification
Clearspan marquee manufacturers provide engineering packs with calculated holding loads per anchor point. These are specific to the structure model, span width, bay configuration, wall height, and calculated wind load for the site and duration.
When planning a clearspan installation: obtain the engineering pack, identify the minimum holding load per anchor point, match your stake specification, conduct a ground pull test, and document the result. CDM Regulations 2015 apply to clearspan installation as construction work.
A bent stake at a clearspan base plate is not an extraction inconvenience. It is a compromised anchor in a load path with no redundancy. Hogan's heat-drawn point and high alloy steel are what make the anchor specification achievable on the ground conditions UK clearspan operators actually encounter.
Applicable Standards
BS EN 13782:2015 is the primary UK and European standard for temporary tent structures over 50 sq m. The MUTA Best Practice Guide is the operational standard for UK clearspan marquee hire. CDM Regulations 2015 and HSE temporary demountable structures guidance both apply to installation and public opening.
BS EN 13782:2015 | MUTA Best Practice Guide | MUTA CDM Guidance | HSE Temporary Demountable Structures
Common Questions
What size stakes for clearspan and frame marquees?
For smaller clearspan applications, the 30″ (770mm) or 36″ (920mm) Tiger Stake is recommended. For larger clearspan marquees with higher structural loads, the 42″ (1070mm) or 60″ (1530mm) is more typical — depending on structure width and the manufacturer's engineering specification. Ground conditions and structural engineer requirements will determine the final choice.
Do clearspan marquee installations require engineering specifications?
Many clearspan installations are governed by structural engineering specifications that define minimum holding loads per anchor point. A stake driven accurately to its intended depth delivers the holding power that was calculated for it — precision matters both for structural safety and for compliance on public events requiring engineering sign-off. If you're unsure what your structure requires, get in touch and we can advise.