Rooftop mechanical platforms are working-at-height jobs by definition. That means guardrails, access and walkways are the compliance foundation — not decoration.
Guardrails
Top rail 900–1100 mm, mid-rail, toeboard where required. Continuous around every fall edge over 2 m.
Access
Stair or ladder access rated for the working load, with landing at deck height and guardrail continued around the landing.
Walkways
Non-slip walking surface, 600 mm min clear width around plant, 750 mm between units where a coil pull-out is required.