Erection, Modification, and Dismantling Procedures
Sequence and planning
Erection follows a planned sequence: set out, base and sole boards, standards, ledgers, transoms, bracing, ties, platform, guardrails, toe boards, then access. Dismantling is the reverse, top-down, removing ties only as work proceeds. A method statement, risk assessment, and competent supervision are prerequisites. Modifications (adding a lift, removing a tie, cutting a ledger) require design review - never improvise.
Competence and coordination
Erectors must be trained and competent, often with a scaffolding card or qualification. Coordination with other trades prevents clashes. Hot works near scaffolds need permits and fire watch. Partially erected scaffolds must be stable and signed.
Traps
- Erecting top-down or dismantling bottom-up.
- Removing ties before the lift above is complete.
- Treating a modification as routine when it changes load paths.
- Leaving incomplete scaffolds unmarked and accessible.
- Passing materials by throwing rather than using a gin wheel or hoist.
Rule of thumb
Build up, strip down; never remove a tie or brace until the section it supports is complete and stable. If a change alters the design, get it approved.
Worked example
A team wants to remove a facade brace to fit a hoist. Correct action: stop, refer to the designer, and provide an alternative brace or tie; do not simply remove it and continue.