Fall arrest vs guardrails. When each is right.

The regulatory hierarchy

Ontario OHSA (Industrial Establishments, O. Reg. 851; Construction Projects, O. Reg. 213/91) consistently prefers guardrails over fall arrest where geometry permits a guard. The reasoning: passive protection doesn't fail because someone forgot a step. The standard hierarchy of controls (eliminate → substitute → engineer → admin → PPE) places guardrails in "engineer" and fall arrest in "PPE" — guardrails are higher in the hierarchy.

Translation: if a guardrail can be installed, it should be. Fall arrest is for situations where a guardrail can't be — typically open edges that need to remain accessible (loading docks during use, conveyor edges, certain rooftop work).

Where guardrails win

• Mezzanine and platform edges — 42" guard with mid-rail and kick-plate per OBC §3.3.1.18.
• Stair and ramp edges — both sides on egress stairs, with code-compliant handrail height.
• Catwalks and elevated walk routes — full perimeter guarding.
• Rooftop perimeters on regularly-accessed roofs — non-penetrating guards available where roof membranes can't be punctured.

Where fall arrest is the answer

• Loading dock edges in active use — the dock has to be accessible to trailers; permanent guards aren't an option. PFAS with self-retracting lifelines on overhead anchor points are typical.
• Roof work on an unguarded roof — PV maintenance, HVAC service on roofs without permanent perimeter guards.
• Window-cleaning and exterior facade work — outside the structural-steel scope but illustrative of where PFAS dominates.
• Confined-space access — sometimes requires retrieval systems that integrate with PFAS.

The 2018 OSHA shift on cage ladders

This one trips up Ontario buyers because it isn't directly Ontario law but shapes industry practice. In 2018, US OSHA's revised 1910.28 phased out safety cages as the sole fall protection on fixed ladders > 24 ft on new installations — moving to a requirement for personal fall arrest or fall restraint instead. Existing cages on existing ladders were allowed to remain.

Ontario OHSA O. Reg. 851 (Industrial Establishments) still recognizes safety cages on fixed ladders without the 24-ft phase-out. So in Ontario, a new fixed ladder > 24 ft can still be built with a cage — and many are, because the design is simpler and the worker doesn't need fall-arrest training and equipment for routine access.

Where it matters for retrofits:

• Cross-border buyers (US-headquartered companies operating in Ontario) often standardize to OSHA practice. They'll spec PFAS even where Ontario law allows cages.
• Insurance carriers sometimes require post-OSHA-2018 practice regardless of jurisdiction.
• Specific vendor pre-qualification programs default to OSHA standards.

We build to whichever rule applies to the specific project — and we flag the choice on the drawing, with the relevant standard cited (OHSA Reg. 851 or OSHA 1910.28). See cage ladders for the structural side.

Mixed systems

It's common for a single project to combine both. Example: a roof-access system might have:

• Roof-access stair with continuous 42" guard (passive).
• Cage ladder from upper landing to a final platform (passive).
• PFAS anchor points on the roof itself for service work beyond the protected area (active).

The choice on each segment goes on the drawing, with the regulation citation that drove it.

What we don't do

We're a structural fabricator. We design and install the steel side: guards, ladders, stair systems with code-compliant guards. Anchor points for fall arrest systems we'll build to a structural engineer's certified-anchor design, but the certification itself is a specialty service we coordinate with — we don't certify PFAS anchors as a standalone scope.