Industry: Construction

Establish the legal foundation for all scaffold work. Covers why scaffolding is one of OSHA’s highest-priority construction hazards, the scope of 29 CFR 1926 Subpart L, and the full competent-person definition — what the role requires, what authority it carries, and what happens when it’s absent or under-qualified. Introduces the scaffold tag system (green/yellow/red) and the inspection obligation that runs through every module that follows.

Identify and distinguish the most common supported scaffold systems used in construction. Covers frame/fabricated scaffolds, tube-and-coupler, system scaffolds (ringlock, cuplock), mobile/rolling scaffolds, ladder-jack, pump-jack, and specialty types. For each type: what it looks like, what it’s used for, how it’s assembled, and the specific requirements that apply under 1926.452. Interactive match-and-identify exercises run throughout.

Learn to identify and differentiate suspended scaffold systems — those supported from above by ropes, cables, or rigid supports rather than from below. Covers single-point adjustable (bosun’s chair), two-point adjustable (swing stage), multi-point adjustable, needle beam, catenary, and interior hung scaffolds. For each type: the rigging requirements, the fall protection requirements, and the additional competent-person obligations that apply beyond the general scaffold requirements.

Master the vocabulary of scaffold components before applying the rules that govern them. Covers the anatomy of supported scaffold systems (standards, ledgers, transoms, diagonal braces, base plates, mudsills, coupling pins, guardrail components) and suspended systems (outrigger beams, wire ropes, hooks, tiebacks, counterweights, stirrups, platforms). A tap-to-explore scaffold diagram lets learners test their knowledge of each part before moving to the requirements modules.

Apply the platform and planking requirements that govern every scaffold surface. Covers minimum platform width (18 inches), the full-planking requirement, permissible plank gaps (1 inch maximum), plank overhang rules (6–12 inches), the conditions requiring cleating or securing, solid sawn vs. engineered lumber specifications, maximum spans by plank thickness, and the three duty ratings (light: 25 psf, medium: 50 psf, heavy: 75 psf). Includes a load-calculation exercise and a scenario on recognizing overloaded platforms.

Learn the specifications for every component of a compliant scaffold guardrail system, and the falling-object protection methods required at and above 10 feet. Covers top rail height (38–45 inches), mid-rail placement (~21 inches), end-rail requirements, load capacity (200 lbs in any direction), cross-brace guardrail substitution rules, toe board height (3.5 inches minimum), barricade and catch platform requirements, and the prohibition on storing materials at the front edge of platforms without additional protection.

Understand the stability requirements for supported scaffolds and learn to identify conditions that compromise them. Covers the 4:1 height-to-base ratio, base plate and mudsill requirements, tie and brace spacing rules, the conditions that require horizontal ties, the use of outrigger frames to widen the base, and the competent person’s pre-erection site assessment. Includes a ratio-calculation exercise and a set of site scenarios where learners identify the stability violation and correct it.

Apply the rigging and stability requirements specific to suspended scaffold systems. Covers outrigger beam setup and counterweight calculations, wire rope inspection criteria (broken wires per lay, kinks, corrosion), hook and connector requirements, tieback and anchorage rules, the prohibition on using rooftop HVAC equipment as an anchor without engineering approval, and the competent person’s pre-use suspension system inspection. Includes rigging-diagram exercises and a go/no-go wire rope assessment.

Apply fall protection requirements for all scaffold types and work tasks. Covers the 10-foot fall protection trigger, the preference for guardrail systems on supported scaffolds, the mandatory personal fall arrest system requirement for single-point and two-point suspension scaffolds, self-retracting lifeline vs. vertical lifeline selection, the prohibition on using the scaffold structural members as anchor points for fall arrest systems, and the competent person’s role in evaluating and documenting fall protection decisions.

Learn the access and egress requirements that govern how workers get on and off scaffold systems. Covers the 2-foot maximum height from scaffold to access point, stair towers, portable ladders, hook-on ladders, self-contained ladders integral to frames, direct access criteria, the prohibition on using cross-braces as a means of access, and the competent person’s responsibility to evaluate and designate safe access routes before workers use the scaffold. On-the-job scenarios test access hazard identification.

Bring together the inspection process, daily operations responsibilities, and site hazard management. Covers the pre-shift inspection checklist (platform, planking, connections, ties, braces, footings, fall protection, guardrails), the tag assignment and update process, maximum wind speed limitations, the prohibition on working on scaffolds during storms or high winds, overhead power-line clearance requirements, debris and housekeeping rules, barricade and danger area requirements below elevated scaffold work, and field decision scenarios that test stop-work judgment.

Establish a rescue plan before starting scaffold work, and consolidate everything before the certification exam. Covers the OSHA requirement that a rescue plan exist and be communicated before workers use suspended scaffolds, rescue methods and equipment, the six core rules that govern every scaffold decision, the key numbers every worker must know (the 4:1 ratio, 10-foot fall protection trigger, 18-inch platform width, 1-inch plank gap maximum, 38–45-inch guardrail height), and a full course review. Followed by the 16-question certification exam.

A: OSHA’s scaffolding standard for construction is 29 CFR 1926 Subpart L, which includes Section .450 (scope and definitions), .451 (general requirements for all scaffolds), .452 (additional requirements for specific scaffold types), and .454 (training requirements). Subpart L applies to all scaffold systems used in construction work, including supported, suspended, and aerial lift scaffolds. It covers platform requirements, fall protection, access, structural stability, and the duties of the competent person.

A: Under 29 CFR 1926 Subpart L, the scaffold competent person must be capable of identifying hazardous or dangerous conditions related to scaffolding — including structural defects, overloading, improper erection or dismantling, and inadequate fall protection — and must have authority to stop work and correct those conditions immediately. The CP must inspect every scaffold before each work shift and after any event that could affect structural integrity, and must direct the erection, movement, dismantling, and alteration of all scaffold systems.

A: The 4:1 height-to-base ratio means a freestanding scaffold’s height cannot exceed four times the minimum base dimension unless it is restrained from tipping. For example, a scaffold with a 5-foot-wide base can stand no more than 20 feet tall without being tied, braced, or otherwise anchored. This requirement applies to supported scaffolds under 29 CFR 1926.452. The competent person is responsible for verifying the ratio is maintained before workers are allowed to use the scaffold.

A: Under 29 CFR 1926.451(g), fall protection is required for all scaffold work at heights of 10 feet or more above a lower level. For most supported scaffolds, guardrail systems are the standard method of protection. On single-point and two-point adjustable suspension scaffolds, personal fall arrest systems must be used. The competent person determines the appropriate fall protection based on scaffold type, work task, and site conditions. Guardrail top rails must be between 38 and 45 inches high, with mid-rails at approximately half that height.

A: Under 29 CFR 1926.451(b), scaffold platforms must be fully planked or decked between the front uprights and the guardrail supports, with gaps between planks no greater than 1 inch unless the employer can demonstrate that a wider gap is necessary. Platforms must be at least 18 inches wide. Planks must extend 6 to 12 inches beyond their support unless cleated or otherwise secured. Scaffold platforms are rated light duty (25 lbs/sq ft), medium duty (50 lbs/sq ft), or heavy duty (75 lbs/sq ft) — the competent person must ensure loads never exceed the rated capacity.

A: Under 29 CFR 1926.451(f)(6), scaffolds may not be erected, used, dismantled, altered, or moved within 10 feet of power lines energized at 50 kV or less, or within 10 feet plus 4 inches for every 10 kV over 50 kV for higher-voltage lines. If work must occur closer than these clearances, the power lines must be de-energized and grounded, or insulated, before scaffold work proceeds. The competent person must assess power-line hazards during initial planning and before any scaffold is assembled near energized lines.

A: The scaffold tag system uses colored tags to communicate a scaffold’s status to workers. A green tag means the scaffold has been inspected and is safe to use. A yellow tag means the scaffold is safe for use only with restrictions — for example, limited capacity or required personal fall arrest systems. A red tag means the scaffold must not be used under any conditions and must be repaired or dismantled before it is put back into service. Tags must be placed at all access points. The scaffold competent person assigns and updates tags based on inspection results.

A: OSHA does not specify a fixed renewal interval for scaffold training under 1926 Subpart L, but retraining is required when the employer has reason to believe a worker lacks the skill or understanding needed to work safely — including after a near-miss, an inspection failure, or a change in scaffold type, work task, or site conditions. Annual refresher training is the industry standard and the recommendation of Mid-America Safety & Environmental. Competent persons should retrain whenever their inspection skills or system knowledge need updating.