Guides
Work at height: site prevention
Updated March 20, 2026
Falls are severe. Use a clear hierarchy: eliminate exposure when possible, then collective protection, then PPE—supported by training and inspection.
Plan before you climb
Pick the safest access for the task: work platform, compliant scaffold, lift, lifelines—depending on context.
Plan material handling aloft: anchor points, drop zones, and signage.
Collective protection first
Guardrails, solid platforms, and nets reduce exposure for everyone—not only the person at the edge.
Check installation, component condition, and changes after moves.
Personal systems and anchorage
When collective measures are not feasible, harnesses and anchors must match fall line and clearance.
Inspect lanyards, connectors, and shock absorbers per manufacturer guidance and your program.
Field checks
Review ladders and stepladders: stability, proper extension, and whether work from the top cap is actually allowed.
Use a dedicated checklist so guardrails, decks, access, and weather criteria are not skipped.
Exact requirements depend on regulations and risk analysis. Confirm with your prevention team or CNESST resources.
Related checklists
Checklists for height-related work and access:
Common questions
- What is the first question for work at height?
- Can we do it with less exposure? If not, what collective measure is realistic before relying on PPE?
- Do scaffolds need daily inspection?
- Inspect after erection, after major changes, after events that could affect stability, and at the cadence your program defines.
- How should we handle weather?
- Wind, rain, and ice change traction and loads. Set clear stop-work criteria and communicate them.
- Where is a checklist for my trade?
- OK Sécurité groups lists by task—scaffold, hoisting, cross-cutting height work. Pick the list that matches your work.