Scaffolding Planning and Site Assessment
What the planner must establish before any tube is cut
Advanced scaffold planning starts with a documented site assessment, not with a catalogue. The planner must establish ground bearing capacity and the presence of buried services, overhead power lines and their safe clearance distances, access and egress routes for both workers and the public, the proximity of openings, fragile roofs, excavations and traffic, and the exposure of the elevation to wind. The intended duty (access, edge protection, support to formwork, or a loading platform) drives the design class, and the design class drives the configuration. A common error is to select a scaffold from a previous job because it looked similar; the assessment must be specific to this site, this ground, and this duty.
Traps that appear in questions
Questions often test the hierarchy: avoid work at height first, prevent falls second, mitigate the residual risk third. A scaffold is not automatically the correct answer, and a question that describes a task completable from the ground is testing whether you reach for a tower. Other traps include confusing the scaffold designer's role with the erector's, treating a generic (non-site-specific) risk assessment as sufficient for a complex job, and assuming that a competent person can approve a design change on site. Design changes belong to the designer; the erector may only build what is specified.
Worked rule of thumb
For a new site, walk the perimeter and record, per elevation: ground type and any soft spots, slope, overhead hazards, public interface, and the maximum height that elevation will reach. If any elevation exceeds the height at which the manufacturer's or standard configuration stops applying, a design is required. A useful prompt is "ground, gap, grid, gust" - ground bearing, gaps and openings, the structural grid of the building, and wind exposure.
Documentation
Expect to be asked what the handover must contain: the design and configuration, the duty load, the sequence of erection and dismantling, the tie pattern, and the inspection regime.