Alberta Fall Protection: What the OHS Code Actually Requires on a Roof
If you are working in Alberta, own property there, or you have come from another province and assumed the rules are the same everywhere, this page is worth a few minutes of your time. Alberta’s fall protection rules follow the same broad principles as the rest of Canada, but there are some specific differences, particularly around trigger heights, that catch people out regularly.
This is not a safety training course and it is not legal advice. It is a plain-English breakdown of what Part 9 of the Alberta OHS Code requires on a roofing job, written from field experience rather than a textbook.
Who Oversees Fall Protection in Alberta
In British Columbia, WorkSafeBC sets and enforces the rules. In Alberta, it is Occupational Health and Safety (OHS) under Alberta Labour and Immigration. The governing document is the Alberta OHS Code, specifically Part 9, which covers fall protection for all industries including construction and roofing.
The standards for physical equipment, harnesses, lanyards, anchor hardware, are still CSA Z259 series, the same as BC. The difference is in the rules around when protection is required and what form it must take.
The Hierarchy: Same Principle, Slightly Different Language
Alberta uses the same protective hierarchy as the rest of Canada. You work down the list only when the option above it is not reasonably practicable:
- Eliminate the hazard entirely
- Passive protection, guardrails, covers, barriers
- Travel restraint, stops you reaching the fall point
- Fall arrest, catches you after a fall
One thing worth noting is that Alberta’s OHS Code uses the term “travel restraint” rather than “fall restraint.” Different label, same principle. If someone asks you about it on an Alberta site, use that wording.
The Two Trigger Heights: Where Alberta Differs From BC
This is the most important difference and the one most likely to come up.
BC has one main trigger: fall protection is required at 3 metres or more. Alberta has two.
The 3 metre trigger works the same way as BC. At any temporary or permanent work area where a worker could fall 3 metres or more, fall protection is required. On a flat commercial roof, you are almost always above this threshold.
The 1.2 metre secondary trigger applies specifically to permanent work areas. If a worker at a permanent work area could fall more than 1.2 metres, a guardrail is required. If a guardrail is not practicable, a travel restraint system must be used instead.
BC does not have this second rule. It is an Alberta-specific requirement that trips up workers and employers who have moved between provinces without checking.
There is also a height-independent rule in both provinces: fall protection is required at any height if the surface below presents a greater risk of injury than a flat, solid surface. Exposed rebar, equipment, skylights, and similar hazards bring the rules into play regardless of how far off the ground you are.
The Fall Clearance Formula
This is the same calculation as BC because physics does not change at the provincial border.
If someone is using a fall arrest system, you need enough clear space below them for the system to stop the fall before they hit anything:
- L, lanyard length: 1.8 metres (6 feet standard)
- E, energy absorber extension: up to 1.2 metres as the shock pack deploys
- D, D-ring to feet: approximately 1.5 metres
- S, safety buffer: 1.0 metre minimum
Worst case total: 5.5 metres of clear space below the worker’s feet.
On a low-slope roof over a single-storey building, a standard 6-foot lanyard may not provide enough clearance. Self-retracting lifelines (SRLs) are the more practical choice in most flat roofing scenarios because they arrest a fall far more quickly and reduce the total distance needed significantly.
Anchor Points: Different Numbers, Similar Reality
This is where Alberta’s wording differs from BC, though the practical outcome is similar.
In BC, anchor points must withstand 2,270 kg (5,000 lbs) per person attached.
In Alberta, the OHS Code states that a permanent anchor must have a minimum breaking strength of 16 kN per worker, or be capable of withstanding twice the Maximum Arresting Force (MAF) in any direction the load may be applied.
16 kN is roughly 1,630 kg, which looks lower than BC’s figure on paper. The “twice MAF” clause in practice keeps real-world requirements in a similar range. If an anchor does not meet the standard requirements, it must be designed and certified by a professional engineer.
As with BC, untested or improvised anchor points are one of the most common compliance gaps on older Alberta commercial roofs.
The Written Fall Protection Plan
This is a requirement that BC also has, but it is worth calling out specifically for Alberta.
Under Section 140(1) of the OHS Code, a written fall protection plan is required when workers are exposed to a fall of 3 metres or more and are not protected by guardrails. The plan must be site-specific. A generic document does not satisfy this requirement.
If you are a property owner hiring a roofing contractor for work on a building with unguarded edges, asking whether a site-specific fall protection plan exists is a reasonable question. A contractor who cannot produce one is not compliant.
Warning Lines on Alberta Flat Roofs
Warning lines, flagged rope or cable set back from the roof edge, are a permitted control measure in Alberta for certain flat roof work. They must be positioned at least 2 metres back from any unguarded edge. They are an administrative control, not a physical barrier, and workers must not cross the warning line without being connected to a fall arrest or travel restraint system.
They work well for large open roof areas where a significant portion of the work takes place well away from the perimeter. They are not a substitute for proper protection near the edge.
The Reference Card
The card below covers the Alberta hierarchy, the two trigger heights, the clearance formula, anchor requirements, and the written plan obligation, in a format you can screenshot or bookmark for site use.
Alberta Fall Protection
| SRL | Self-Retracting Lifeline — reels in as you move, locks on a fall |
| Y LAN | Twin-leg lanyard — 100% connection when moving between anchors |
| PFAS | Personal Fall Arrest System — harness + lanyard + anchor as one system |
| CSA | Z259 series — certification standard for all fall protection gear in Canada |
Information on this page is based on the Alberta OHS Code Part 9 and is provided for general guidance only. Always refer to the current legislation and consult a qualified safety professional for site-specific requirements.
FAQ
Q: At what height is fall protection required in Alberta?
A: Alberta has two trigger heights. At any temporary or permanent work area where a worker could fall 3 metres or more, fall protection is required. At permanent work areas where a worker could fall more than 1.2 metres, a guardrail is required. This secondary 1.2 metre rule does not exist in BC.
Q: What is the difference between Alberta and BC fall protection rules?
A: Both provinces require fall protection at 3 metres. Alberta also requires guardrails at permanent work areas above 1.2 metres, which BC does not. Alberta’s anchor requirements are expressed as 16 kN rather than BC’s 2,270 kg figure, though the practical standard is similar. Both provinces use CSA Z259 series equipment standards.
Q: Is a written fall protection plan required in Alberta?
A: Yes. Under Section 140(1) of the Alberta OHS Code, a written fall protection plan is required when workers are exposed to a fall of 3 metres or more and are not protected by guardrails. The plan must be site-specific; a generic document does not satisfy the requirement.
Q: What is the anchor strength requirement in Alberta? A: Permanent anchors must have a minimum breaking strength of 16 kN per worker, or be capable of withstanding twice the Maximum Arresting Force in any direction. Anchors that do not meet the standard must be designed and certified by a professional engineer.
Q: Does the 3 metre rule always apply in Alberta?
A: No. Fall protection is also required at any height if the surface below presents a greater risk of injury than a flat, solid surface, for example, exposed rebar, equipment, or skylights. The height threshold does not apply near floor holes or unguarded openings.
About Peter Coscolin
