Components
What is a base plate?
A base plate is the steel plate at the foot of a standard. It spreads load from the tube onto the sole board or ground below, so the standard does not punch into what it stands on.
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<img src="https://scaffoldoptix.co.uk/glossary/base-plate/diagram.svg" alt="base plate — scaffold diagram from ScaffoldOptix" width="880" height="620" loading="lazy">
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<a href="https://scaffoldoptix.co.uk/glossary/base-plate">What is a base plate?</a> — diagram by
<a href="https://scaffoldoptix.co.uk">ScaffoldOptix</a>
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</figure>A standard is a tube, and the end of a tube is a very small area. Everything above it — the structure, the boards, the materials, the people — arrives at the ground through that ring of steel. The base plate takes that load and spreads it out.
Base plates have a spigot or shank that locates into the bottom of the standard, keeping it centred rather than allowing it to wander off the plate. Adjustable base plates add a threaded section and a nut so the height can be wound up or down, which is how a level scaffold gets built on sloping or stepped ground.
The base plate spreads load onto the sole board, and the sole board spreads it again onto the ground. They are two stages of the same job and neither substitutes for the other.
What goes wrong on site
- Standards stood directly on the ground with no base plate at all, usually on a short-duration scaffold that then stays up for months.
- Base plates not centred, or the standard sitting on the edge of the plate rather than located on the spigot.
- Adjustable base plates wound out near the limit of their thread to make up a large level difference, rather than the ground being prepared or the scaffold stepped.