Level 1, Unit 1, Section 3 – 3.3 Types of Access Equipment

3.3.1 — Ladders

Ladders are the most used access equipment in the HVAC-R trade. They provide quick, lightweight access to elevated areas for short-duration tasks such as inspection, minor adjustments, and tool access.

📋

Types of Ladders

Stepladder

A self-supporting A-frame ladder for indoor tasks where a leaning surface is unavailable. Available in fibreglass (non-conductive — preferred near electrical equipment) and aluminum. The spreader bar must be fully locked before use.

Extension Ladder

Base and fly sections that slide to adjust height. Must lean at the 4-to-1 rule (75°). Top must extend ≥ 1 m above the landing. Requires tie-off at top and/or bottom to prevent lateral movement.

Combination Ladder

Can be used as stepladder, extension ladder, or trestle. Versatile but heavier than single-function ladders.

Articulating (Multi-Position) Ladder

Multiple hinged sections configurable as stepladder, extension, scaffold support, or stairway. Popular for irregular surfaces and tight spaces.

Fixed Ladder

Permanently installed (e.g., rooftop access). Must comply with CSA Z259 and building codes regarding cage height, safety devices, and step spacing.

★

Ladder Duty Ratings (CSA / ANSI)

Type	Max. Working Load	Application
Type IAA	170 kg (375 lb)	Extra-heavy duty industrial
Type IA	136 kg (300 lb)	Extra-heavy duty industrial — Minimum for HVAC-R
Type I	113 kg (250 lb)	Heavy duty industrial / commercial — Minimum for HVAC-R
Type II	102 kg (225 lb)	Medium duty commercial
Type III	91 kg (200 lb)	Light duty household — NOT for trade use

💡

Selection Rule

Always account for the combined weight of the worker, clothing, tools, and any materials being carried when selecting a duty rating. Type IA or Type I is the minimum for HVAC-R trade use.

✅

Ladder Safety Procedures

Inspect before each use: check for cracked rails, bent rungs, missing feet, and defective locks.
Set leaning ladders at 75° (4-to-1 rule): base distance = ¼ of working height.
Secure top and bottom of leaning ladders; never rely solely on friction.
Face the ladder while ascending and descending.
Never stand on the top two rungs of a stepladder or the top three rungs of a leaning ladder.
One person on a ladder at a time unless the ladder is certified for two-person use.
Keep ladder clear of doorways, driveways, and pathways; use barriers and signage.
Use fibreglass ladders near electrical panels, switchgear, or overhead lines.

⚠

Limitations of Ladders

Not suitable for tasks requiring both hands free or lasting more than a short duration.
Limited working space; cannot carry large components while on a ladder.
Maximum height for portable ladders commonly up to 9 m for extension ladders without special provisions (verify manufacturer specifications and provincial regulations).

3.3.2 — Platforms

Platforms provide a horizontal working surface at elevation, ranging from simple plank-on-bracket arrangements to engineered modular work platforms.

■

Types of Platforms

Work Platform (Freestanding)

Pre-engineered, self-supporting platforms in fixed or adjustable heights. Equipped with guardrails and non-slip decking. Ideal for repetitive tasks at a fixed height.

Rolling Platform

Portable platforms on wheels with locking casters. Must be locked before and during use. Not to be moved while occupied unless specifically engineered and certified for occupied movement.

Mezzanine / Permanent Platform

Structurally integrated into the building. Governed by building code rather than access equipment regulations. Provides permanent access to mechanical equipment (e.g., boilers, large AHUs) at upper levels.

✅

Platform Safety Requirements

Decking must be secure, continuous, and free of gaps greater than 25 mm (1 in.).
Guardrails required when platform height ≥ 2.4 m (8 ft) or as specified by provincial regulation.
Load capacity must be posted and must not be exceeded.
Access must be by a dedicated stairway or ladder — do not use the platform structure to climb.

3.3.3 — Staging

In the HVAC-R trade, “staging” refers to temporary elevated work areas assembled from planks or boards supported by brackets, horses, or trestles. Typically used for lower-height interior work such as installing ductwork or piping along ceilings.

▬

Types of Staging

Scaffold Planks (Staging Boards)

Must be scaffold-grade graded lumber or manufactured composite/aluminum planks rated for the intended load.
Planks must overlap supports by at least 150 mm (6 in.) and must not overhang by more than four times their thickness.
Must be cleated or otherwise secured to prevent displacement.
Inspect before each use for splits, cracks, excessive knots, and decay.

Trestle Staging

Consists of planks laid across two or more adjustable trestles (sawhorse-type supports).
Height typically limited to 1.8 m (6 ft) for this configuration unless guardrails and toe boards are provided.
Trestle spreaders must be fully locked before loading.

3.3.4 — Scaffolding

Scaffolding is a temporary structure erected to provide an elevated working platform for workers and materials. Used in HVAC-R for large commercial and industrial installations requiring extended work at height — rooftop equipment, large piping mains, or overhead ductwork in multi-storey spaces.

▭

Types of Scaffolding

▭

Baker’s Scaffold (Rolling Scaffold)

Most Common — Level 1

Light-duty, low-profile rolling scaffold assembled from two H-frame uprights, cross-braces, and a plank deck.

Height range: 0.6 m to 1.8 m (2 ft to 6 ft) working platform height
Load capacity: 225–340 kg / 500–750 lb per platform (check manufacturer’s rating)
Best for: Interior ceiling and wall work; duct, pipe, and VAV box installation
Limitations: Not rated for exterior use in high winds; must be rolled on smooth, level floors
Key rules: Lock all casters before ascending; never move while occupied; do not stack beyond manufacturer’s limits

End Frame Scaffold (Frame Scaffold)

Modular system of prefabricated H-frames connected by cross-braces, plank decks, and guardrail posts. The most widely used scaffold system in commercial construction.

Height range: Can be stacked to considerable height; provincial regulations specify maximum tier heights and tie-in requirements
Load capacity: Heavy duty — rated for multiple workers and material storage
Best for: Exterior façade work, large interior mechanical rooms, rooftop equipment installation
Limitations: Requires trained erectors and competent person supervision; time-intensive to erect and dismantle
Tie-in requirement: Must be tied to the building structure per CSA Z797 and provincial OHS regulations

Tube-and-Coupler Scaffold

The most adaptable system, built from individual steel or aluminum tubes connected by swivel and right-angle couplers. Can be configured to fit any building geometry.

Best for: Complex or irregular structures; industrial plant work around irregular equipment
Limitations: Requires highly experienced erectors; most labour-intensive; extensive engineering and inspection requirements
Coupler types: Right-angle (90° load-bearing), swivel (diagonal bracing), sleeve (end-to-end splicing), putlog/single (ledger to standard)

🔧

Common Scaffold Components

Component	Description
Standard (Upright)	Vertical tube or frame member; transfers all loads to the ground.
Ledger	Horizontal tube running parallel to the scaffold face; supports transoms and planks.
Transom	Horizontal tube perpendicular to the scaffold face; bears the deck planks.
Brace (Diagonal)	Resists racking (lateral sway).
Base Plate	Metal plate at the base of each standard to distribute load.
Adjustable Base Jack	Screw-jack for levelling; must not extend more than 300 mm (12 in.).
Mudsill	Timber plank placed under base plates on soft or uneven ground.
Scaffold Plank / Deck	Load-bearing platform surface; must be scaffold-grade or engineered.
Top Rail	Top guardrail member; minimum 950 mm (38 in.) above the platform surface.
Mid-Rail	Intermediate guardrail member approximately midway between top rail and toe board.
Toe Board	Board at platform edge to prevent tools and materials from falling; typically 150 mm (6 in.) high.
Outrigger	Horizontal frame extending beyond the scaffold face to increase width or stability.
Tie / Anchor	Connection between scaffold standards and the building structure.
Climb-through Frame	Frame with built-in access hole for ladder access between scaffold tiers.

✅

Safe Operation of Scaffolds

▶

Erection Requirements

Erection and dismantling must be supervised by a competent person with scaffold-specific training.
Base plates and mudsills must be properly sized and placed on firm bearing surfaces.
All frames must be plumb and level; adjust base jacks to accommodate uneven surfaces (max. extension 300 mm / 12 in.).
All cross-braces must be installed; no unbraced tiers allowed.
Tie the scaffold to the building at required intervals per CSA Z797 and provincial OHS regulations.
Install all guardrails, mid-rails, and toe boards before the platform is occupied for work.

▶

Access to Scaffold Platforms

Use dedicated scaffold access ladders or stair frames — never climb on cross-braces.
Access openings in the platform must be trapdoor-equipped and closed when not in use.
Provide access at every tier if there is a height difference of more than 2 m (6.6 ft).

▶

Loading and Work Practices

Do not exceed the rated load per bay (combined weight of workers, tools, and materials).
Distribute materials evenly across the platform; do not concentrate loads.
Do not use scaffold platforms to store more material than needed for the immediate task.
Inspect the scaffold daily before use, after any incident, and after any modification.

▶

Baker’s Scaffold — Specific Rules

Level 1 Focus

All four casters must be locked before mounting the scaffold.
Never ride on a baker’s scaffold while it is being moved.
Do not exceed the platform’s rated height (typically 1.8 m / 6 ft for single-level; verify manufacturer for stacked configurations).
Stacked baker’s scaffolds require guardrails and must not be stacked beyond manufacturer’s limits (typically 2 levels maximum).

3.3.5 — Aerial Lifts

Aerial lifts (aerial work platforms, AWPs) are powered mobile machines that elevate workers on an attached platform. Widely used in commercial HVAC-R work for rooftop equipment installation, large duct runs, and pipe installation in warehouses and industrial facilities.

⬆

Types of Aerial Lifts

Articulated Boom Lift

Two or more boom sections joined at a knuckle joint. Multi-articulation allows the platform to reach over and around obstacles — essential for rooftop equipment and parapet walls.

Typical height: 10 m to 20 m; larger units up to 40 m
Best for: Working over roof curbs, equipment pads, and parapet walls
Limitations: Lower lift capacity; tipping risk with improper boom angles

Telescoping Boom Lift

Boom extends in a straight line, offering greater height and horizontal reach. Used for direct vertical access to elevated equipment on building façades or rooftops.

Typical height: 12 m to 46 m for large units
Best for: Tall building façades, high-bay warehouses, open outdoor areas
Limitations: Cannot reach over obstacles; large turning radius; heavier ground-bearing requirements

Scissor Lift

Raises the platform vertically using a pantograph (scissor) mechanism. Provides a large, stable work platform and high load capacity — ideal for carrying heavy HVAC components.

Typical height: 6 m to 18 m
Power: Electric (indoor / no emissions) or diesel/rough-terrain (outdoor)
Best for: Overhead duct and pipe installation; indoor warehouse work
Limitations: Vertical rise only; cannot reach over obstacles; sensitive to uneven ground

☰

Aerial Lift Comparison

Feature	Articulated Boom	Telescoping Boom	Scissor Lift
Max Height	Medium-high (~40 m)	Highest (~46 m)	Medium (~18 m)
Horizontal Reach	High (over obstacles)	High (straight line)	None
Platform Capacity	Low–medium	Low–medium	High
Platform Size	Small	Small	Large
Obstacle Clearance	Excellent	Poor	None
Ground Conditions	Firm / Prepared	Firm / Prepared	Level / Firm
Typical HVAC-R Use	Rooftop work over parapets	Tall façades, open areas	Interior overhead work

✅

Safe Operation of Aerial Lifts

▶

Pre-Operation

Complete a documented pre-use inspection using the manufacturer’s checklist.
Verify that the operator holds required training certification (most provinces require aerial lift operator training).
Check ground conditions: firm, level, free of holes, debris, and surface obstructions.
Identify all overhead hazards: power lines, structural beams, sprinkler piping.
Confirm load in the platform does not exceed rated capacity.
Check all emergency controls (e.g., ground-level emergency lowering) are functional.

▶

Operation

Critical Practices

Wear a full-body harness and lanyard connected to the manufacturer-specified anchor point on the platform (required for boom lifts in most jurisdictions; check provincial regulation for scissor lifts).
Never climb on the guardrails of the platform or use the machine to reach objects beyond the platform.
Do not drive a boom lift in the elevated position except on smooth, level surfaces at low travel speed as permitted by the manufacturer.
Maintain minimum clearance distances from power lines as specified by provincial electrical safety regulations.
Communicate with ground spotters when operating in areas with vehicle traffic or other workers.
Lower the platform fully before moving the machine significant distances.

▶

Post-Operation

Fully retract and lower the boom or scissor mechanism before leaving the machine.
Park on firm, level ground; engage parking brake and wheel chocks if required.
Shut off the machine and engage all locks.
Document any defects or abnormalities and report to the supervisor before the next use.