Types of Fall Protection Systems: A Field Guide

Last updated: March 19, 2026

Your site super just called. The OHS inspector is on the ground floor, headed up to the fifth level where your crew is framing walls along an unguarded edge. The guardrails aren't up yet, two guys are clipped in, and one just stepped out of the control zone without a harness. You have about ninety seconds to figure out if you're compliant or writing a cheque.

That scenario plays out on Canadian construction sites every week. At Safety Evolution, we build fall protection programs for contractors, and the number one gap we see isn't equipment. It's confusion about which system to use and when. Alberta's OHS Code Part 9 gives you a clear hierarchy, but it only works if you actually understand the options.

Fall protection types are the specific systems and methods used to prevent workers from falling or to safely arrest a fall. Under Alberta's OHS Code, fall protection is required when a worker could fall 3 metres or more, less than 3 metres where an unusual possibility of injury exists, or into a hazardous substance or through an opening (Section 139).

What Is the Fall Protection Hierarchy in Alberta?

Alberta's OHS Code Section 139 lays out a mandatory hierarchy. You don't get to pick your favourite system; you use the highest-ranked method that's reasonably practicable for the job.

Here's how it works, from most preferred to least:

1. Guardrails (install them if you can)
2. Travel restraint (if guardrails aren't reasonably practicable)
3. Personal fall arrest (if travel restraint isn't reasonably practicable)
4. Equally effective controls (safety nets, control zones, procedures in lieu)

This hierarchy isn't a suggestion. It's legislation. If an OHS inspector asks why your crew is in harnesses instead of behind guardrails, "we always do it this way" won't hold up. You need to demonstrate that each higher-ranked option was considered and ruled out for a legitimate reason. If your fall protection program needs a second set of eyes, book a free safety assessment and we'll walk through it in 30 minutes.

Most contractors think fall arrest is the gold standard of fall protection. They're wrong. It's the last resort before administrative controls. The fall protection hierarchy exists because preventing a fall is always better than catching one mid-air.

What Are Guardrails and Barriers?

Guardrails are passive fall protection. Once they're installed, they protect every worker in the area without anyone needing to clip in, check equipment, or think about it. That's why Alberta's OHS Code puts them at the top of the hierarchy.

A compliant guardrail system has three components:

• Top rail: Between 1.0 m and 1.1 m above the working surface
• Mid rail: Roughly centred between the top rail and the toe board
• Toe board: At least 100 mm (10 cm) high at the base to prevent tools and materials from falling off the edge

Two main types exist: job-built guardrails (typically lumber on construction sites) and manufactured guardrail systems (steel, aluminum, or composite). Manufactured systems go up faster and meet consistent specs, but job-built guardrails work if they're designed to withstand the required loads.

When to use them: Guardrails are your first choice for any open edge, floor opening, ramp, or platform. They're used on scaffolding, elevated work platforms, around roof edges on permanent structures, and along excavation perimeters. If you can install a guardrail, you're supposed to. Period.

Limitations: Guardrails aren't always feasible. Leading-edge work during steel erection, some roofing operations, and work on narrow structural members make guardrail installation impractical. When that's the case, you document why and move down the hierarchy. If you need help building a fall protection program that covers all these scenarios, Safety Evolution's done-for-you safety services handle the documentation and planning.

How Does Travel Restraint Work?

A travel restraint system prevents a worker from reaching a fall hazard. The worker wears a body belt or full body harness connected by a lanyard to an anchor point. The lanyard is sized so the worker physically cannot get close enough to the edge to fall.

Think of it like a leash. The anchor, lanyard length, and connection point work together so the worker can do their job but can't reach the danger zone. There's no shock absorber needed because, if the system is set up properly, there's no fall to arrest.

Under Alberta's OHS Code (Sections 139 and 142.1), travel restraint is your second option when guardrails aren't practicable. Key requirements:

• Body belts manufactured after July 1, 2009 must be CSA Z259.1 certified
• Temporary anchors for travel restraint need a minimum breaking strength of 3.5 kN (Section 152.1)
• The lanyard length must be short enough to prevent the worker from reaching the edge
• Body belts can only be used for travel restraint or fall restriction, never for fall arrest

Here's the blunt truth about travel restraint: most crews skip it and go straight to fall arrest because they think harnesses are "better." They're not better; they're different. If a six-foot lanyard keeps your roofer two feet back from the edge, they can work without ever loading the system. That's safer than catching them mid-fall and hoping the shock absorber deploys correctly.

A mechanical contractor in Red Deer learned this the hard way. Their crew was doing ductwork on a mezzanine, four metres above grade. Everyone was in full fall arrest: harnesses, shock-absorbing lanyards, SRLs overhead. Problem was, the mezzanine edge was only 3.5 metres from the anchor points. One worker stumbled and the SRL caught him, but the total fall distance (free fall plus shock absorber deployment) meant he swung into the railing below. A travel restraint setup with a shorter lanyard would have kept him away from the edge entirely.

What Is a Personal Fall Arrest System?

A personal fall arrest system (PFAS) is designed to stop a worker safely after a fall has begun. It consists of three core components: a full body harness, a connecting device (lanyard or self-retracting device), and an anchor point. Unlike guardrails and travel restraint, fall arrest allows a fall to happen and then catches the worker before they hit the ground.

Alberta's OHS Code Section 142 requires a CSA Z259.10 certified full body harness. Body belts are not permitted for fall arrest. The harness distributes arresting forces across the chest, shoulders, and thighs to reduce injury risk during a sudden stop.

Here's what a compliant fall arrest system looks like under Alberta regulations:

Critical numbers to remember:

• Maximum free fall with shock absorber: no specific limit, but the system must prevent ground contact (Section 151)
• Maximum free fall without shock absorber: 1.2 metres (Section 151(2))
• Maximum arresting force: 6 kN standard, 8 kN with E6-type shock absorber (Section 151(3))
• Swing drop limit for SRLs: 1.2 metres (Section 145(c))

Fall arrest works. But it comes with complications that travel restraint and guardrails don't. You need clearance calculations to ensure the worker doesn't hit the ground or a lower level. You need a rescue plan in case someone falls and is left suspended. Suspension trauma can become life-threatening in under 30 minutes. Every fall protection plan that involves fall arrest must address rescue procedures, and your crew needs to practise them.

If your fall protection equipment inspection process isn't locked down, none of this matters. A harness that's been exposed to chemicals, UV damage, or a previous fall must be removed from service and either returned to the manufacturer or destroyed (Section 150.2).

What Are Safety Nets and When Are They Used?

Safety nets are passive collective protection. Like guardrails, they protect everyone in the area without individual equipment. A properly installed safety net catches a falling worker and absorbs the fall energy through the net's deflection.

In Canadian construction, safety nets are most common in:

• Bridge construction and structural steel erection
• High-rise concrete forming where guardrails can't be installed at the leading edge
• Large-scale industrial projects with extensive open areas at height

Alberta's OHS Code Section 140(2)(f) specifically requires that rescue procedures be included in your fall protection plan if safety nets are part of the system. Nets must be installed as close as practicable below the working surface and must be inspected regularly for damage, debris accumulation, and proper tensioning.

Safety nets are less common on typical Alberta construction sites because of cost and installation complexity. But on the right project, they eliminate the need for every worker to be individually tied off, which can dramatically improve productivity.

How Do Control Zones and Warning Lines Work?

Control zones are an administrative approach to fall protection. Under Alberta's OHS Code Section 161, a control zone is a marked area at least 2 metres wide measured from an unguarded edge. Workers outside the control zone don't need other fall protection. Workers who enter the control zone must use a fall arrest system.

The restrictions are strict:

• The surface must slope no more than 4 degrees toward the unguarded edge, or slope away from it
• Control zones cannot be used on skeletal structures (steel frame buildings during erection)
• Workers crossing the control zone to enter or leave the work area must still use fall protection while inside the zone
• A competent worker must monitor the control zone and ensure compliance

Warning lines serve a similar purpose. They're highly visible lines (rope, wire, or chain) supported on stanchions at a specified distance from the edge. They alert workers that they're approaching a fall hazard. In many Canadian jurisdictions, warning lines supplement other fall protection measures rather than standing alone.

Designated areas combine warning lines with administrative controls. A designated area is a distinct, clearly marked area where specific work is performed near an edge, and access is limited to trained personnel.

Here's something most site supers don't realize: a control zone by itself does not replace fall protection for workers inside the zone. If your crew needs to work within 2 metres of an unguarded edge on a roof, the workers entering that zone still need harnesses and lanyards. The control zone only protects workers who stay outside of it.

Which Fall Protection System Do You Need?

This is where theory meets your actual job site. Choosing the right fall protection system comes down to three questions:

1. Can you install guardrails? If yes, do it. Full stop.
2. If guardrails aren't practicable, can travel restraint keep workers from the edge? If yes, use it. Shorter lanyards, no shock absorber needed, simpler rescue situation.
3. If neither works, fall arrest is your option. Full body harness, shock-absorbing lanyard or SRL, rated anchor, clearance calculations, and a rescue plan.

Here's a practical decision guide by common scenario:

Whatever system you choose, you need a written fall protection plan any time workers may fall 3 metres or more and guardrails aren't in use (Section 140). That plan must identify the hazards, specify the systems being used, confirm clearance distances, and document rescue procedures.

What Training Does Your Crew Need?

Alberta's OHS Code Section 141 requires fall protection training before workers enter any area where a fall protection system is required. This isn't a generic safety orientation. The training must cover:

• Current Alberta fall protection legislation
• Fall protection plan awareness
• How to identify fall hazards
• Anchor selection and assessment
• Proper use of connecting hardware
• Effects of a fall on the human body (arresting forces, shock absorbers, swing fall, free fall)
• Pre-use equipment inspection
• Emergency response procedures
• Hands-on practice with inspecting, fitting, and connecting fall protection equipment

Notice that list includes hands-on practice. A PowerPoint presentation in the lunchroom doesn't cut it. Workers need to physically handle the equipment, practise connecting to anchors, and walk through rescue procedures. SE's training courses cover these requirements with instant certification and expiry tracking so you don't get caught with lapsed tickets on site. For new hires, combine fall protection training with your construction safety orientation package so they're site-ready from day one.

For a full breakdown of course options, see our fall protection course guide for Canada.

What Is the Difference Between Fall Protection and Fall Arrest?

This trips up a lot of people. Fall protection is the umbrella term for every system that protects workers from falls. Fall arrest is one specific type of fall protection: the system that stops a worker after a fall has started.

Guardrails, travel restraint, control zones, safety nets, and fall arrest are all types of fall protection. Fall arrest is just the one that involves catching a falling worker with a harness, lanyard, and anchor.

The distinction matters because saying "we have fall protection" when you mean "everyone's in a harness" ignores the hierarchy. If you could have installed guardrails but didn't, you're not compliant, even if every worker is clipped in.

We break this down in detail in our post on fall protection vs. fall arrest.