SCF/General/TBT-SCF-007

Scaffold Foundation and Base Plates

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Scaffold Foundation and Base Plates

Toolbox Talk Record

Ref: TBT-SCF-007  |  Issue: 1  |  Date: March 2026
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What?

  • The foundation is the most critical element of any scaffold — failure causes complete collapse.
  • Base plates spread the load from scaffold standards onto the supporting surface below.
  • The ground or surface must support the full design load of the scaffold.
  • Sole boards distribute loads further on soft ground, tarmac, or yielding surfaces.
  • Standards must be set on base plates — never placed directly on bricks or blocks.
  • TG20 guidance provides scaffold foundation requirements for standard configurations.
  • Scaffold foundations must be inspected before loading and after adverse weather.
  • Settlement of one standard can cause progressive collapse of the entire structure.
  • On paved areas, the underlying ground condition must be assessed, not just the surface.
  • Scaffold on suspended slabs or roofs requires structural checks on the support.

Why?

Prevent collapseFoundation failure is the primary cause of catastrophic scaffold collapses.
Load distributionInadequate base plates cause point loading and ground failure.
Legal requirementWork at Height Regulations require scaffolds on suitable foundations.
Progressive failureOne settling standard creates uneven loading bringing down the scaffold.
Do Don't
  • Assess the ground conditions before erecting any scaffold structure.
  • Use base plates under every standard — no exceptions.
  • Place sole boards on soft ground to distribute the scaffold load evenly.
  • Ensure sole boards are timber of adequate size, level, and good condition.
  • Check that paved surfaces are adequately supported from below.
  • Inspect foundations before loading the scaffold and after bad weather.
  • Follow TG20 or the scaffold design for specific foundation requirements.
  • Level the base plates accurately to avoid uneven loading.
  • Drain standing water away from scaffold foundations to prevent softening.
  • Seek structural advice before erecting scaffold on suspended floors or roofs.
  • DON'T erect standards directly on bricks, blocks, or loose materials.
  • DON'T place base plates on frozen ground without assessing thaw settlement.
  • DON'T omit sole boards on soft ground, grass, or clay surfaces.
  • DON'T assume a hard surface means adequate bearing capacity underneath.
  • DON'T allow excavations to undermine scaffold foundations.
  • DON'T load a scaffold before foundations have been inspected and approved.
  • DON'T ignore signs of settlement such as leaning standards or cracked surfaces.
  • DON'T use damaged or undersized base plates or sole boards.
  • DON'T erect scaffold on sloping ground without levelling the base.
  • DON'T remove sole boards or base plates from a loaded scaffold.

See also: Scaffold Safety Awareness | Scaffold Inspection and Tagging
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