Scaffolding, site safety & access

Scaffold ties under OSHA's height-to-base rule, the load on a bay against light, medium and heavy duty and the load classes of BS EN 12811-1, plank spans, face area and hire weeks, and the bearing under a base plate; guardrail and toe-board dimensions, roof anchor spacing, debris nets, ladder setup angles, covered walkways, temporary access ramps and temporary fencing with its wind ballast.

Which rule the scaffold or barrier was put up to, and what it is carrying. A scaffold is tied, planked and loaded to a duty chosen before it went up — light for inspection, heavier where materials are stacked on it — and the arithmetic here only means something against that duty, the manufacturer's instructions or the design it was erected to. The pages count and compare; none of them signs a scaffold off.

Scaffold design itself — tie forces, anchor capacity in the wall, bracing, wind on a sheeted scaffold — and the permanent ramps, stairs and guarding of the finished building, which have a family of their own.