Fragile Roof / Skylight & Penetration Cover Work SWMS

Fragile roof, skylight and penetration cover work is any work carried out on a roof whose surface — fragile cement sheeting, fibreglass or polycarbonate skylights, corroded metal decking, or temporary penetration covers — cannot reliably bear a person's weight. It is high risk construction work under the NSW WHS Regulation 2025 because work on a roof involves a risk of a person falling more than 2 m (s291), so a SWMS is mandatory under s299. What sets this work apart from ordinary roof work is that the fall hazard is not just at the edge: the roof surface itself is the trap. A worker can step onto a skylight that looks like roofing, or onto aged asbestos-cement sheet that has lost its strength, and fall straight through to the floor below. Fragile roofs are responsible for a large share of fatal falls in construction precisely because the danger is hidden across the whole roof plane, not concentrated at the perimeter. The defining controls therefore manage the entire roof area: identifying fragile elements before access, covering or guarding skylights and penetrations, providing load-bearing crawl boards or platforms so workers never bear weight on the fragile surface, and arresting any fall that does occur. Older roofs frequently contain asbestos cement, so asbestos is treated as a live hazard. Fall protection is to AS 1657 and AS/NZS 1891, and SafeWork NSW is the regulator.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Carry out the task from below or from an elevating work platform so workers never set foot on the fragile roof
2. 2Substitution — Substitute a mobile platform or scaffold deck for direct foot traffic on the roof surface where access is required
3. 3Engineering — Load-bearing crawl boards, walkways or staging that span the structural members so weight is never on the fragile surface
4. 4Engineering — Fixed or temporary covers and guardrails over every skylight and penetration, secured against displacement
5. 5Engineering — Roof-edge guardrail or perimeter fall-arrest, and catch decks or safety mesh beneath fragile areas where practicable
6. 6Administrative — Pre-access survey identifying fragile elements, skylights and asbestos-cement sheeting, marked on a roof plan
7. 7Administrative — Asbestos controls — assume asbestos in aged cement sheet until tested, with licensed handling where disturbed
8. 8Administrative — Permit and exclusion of others from beneath the work area, with a rescue plan for an arrested fall
9. 9PPE — Fall-arrest harness with a short lanyard or restraint, connected to a certified anchor or static line
10. 10PPE — Respiratory protection for any asbestos-cement disturbance, plus helmet, gloves and non-slip footwear

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At 7:30 am a maintenance crew from Apex Roofing is sent to replace a leaking flashing on a 1980s factory roof. Before anyone steps up, the leading hand walks the roof plan from the survey: the sheeting is aged asbestos cement, there are six fibreglass skylights, and two old penetrations are covered with plywood. Treating the whole surface as fragile, the crew sets crawl boards that span purlin to purlin so no one ever bears weight on the sheet itself, and lays secured covers and guardrails over every skylight along the route to the flashing. A static line is rigged and each worker clips on with a short restraint lanyard before leaving the access platform. The flashing is near a cement-sheet join, so the work is treated as potential asbestos disturbance: the area is wetted, minimal cutting, and a P3 respirator worn, with the offcut bagged as asbestos waste. One worker notices a plywood penetration cover has warped; it's barricaded and no one crosses it. The job is done from the crawl boards, the roof is left as found, and the harnesses come off only back on the platform.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing the Risk of Falls at Workplaces Code of Practice
• AS 1657

Frequently asked questions