OSHA 10-Hour Construction Safety (OSHA 10) Overview
These study notes are designed to prepare candidates for the OSHA 10-Hour Construction Safety outreach program. The content is anchored to OSHA's 29 CFR 1926 construction standards and the official OSHA construction outreach training materials. The notes cover the mandatory Focus Four hazards and other key construction safety topics. Candidates should verify specific pass marks, fees, and program details with their authorized training provider or OSHA.
For Technical Conquer practice planning, this module is tracked as 50 questions over about 90 minutes with a listed pass mark of 75%. Treat those numbers as practice baselines and verify the current official format before scheduling.
How This Guide Is Organized
The sections below turn the syllabus into studyable subject blocks. Read a subject first, explain the must-know ideas without notes, then use questions, flashcards, and mind maps to test whether the knowledge holds under field-style pressure.
- OSHA Regulatory Framework and the Focus Four Hazards
- Personal Protective Equipment (PPE) and Site Health Hazards
- Stairways, Ladders, and Scaffolding Systems
- Excavation, Trenching, and Soil Mechanics
- Hand and Power Tool Safety and Guarding
- Material Handling, Storage, and Fire Protection
Exam Snapshot and Readiness Target
Format: 50 questions, 90 minutes (practice baseline); actual program may vary by provider
Candidate level: Entry-level construction workers, supervisors, and safety personnel
Readiness target: Demonstrate knowledge of OSHA standards, hazard recognition, and prevention strategies for construction sites
Most candidates should budget at least 34+ focused study hours, then adjust upward for unfamiliar equipment, code, regulatory, commissioning, controls, or calculation-heavy content.
OSHA Regulatory Framework and the Focus Four Hazards
Syllabus Focus
- OSHA Act, employer/worker rights and responsibilities
- 29 CFR 1926 Subparts C through Z
- Focus Four: Falls, Struck-by, Caught-in/between, Electrocution
Key Notes
- OSHA covers private-sector workers; public-sector workers may be covered by state plans.
- Employers must provide a workplace free of recognized hazards (General Duty Clause).
- Workers have the right to request an OSHA inspection, participate in inspections, and refuse imminent danger work.
- Focus Four hazards account for the majority of construction fatalities: Falls (~36%), Struck-by (~10%), Caught-in/between (~5%), Electrocution (~9%).
- Fall protection is required at 6 feet in construction (29 CFR 1926.501).
- Struck-by hazards include flying objects, falling materials, and swinging loads; hard hats and high-visibility vests are key controls.
- Caught-in/between hazards include trench collapses, machinery entanglement, and being pinned between objects.
Must Know
- OSHA 300 Log: recordkeeping for work-related injuries and illnesses.
- Employer posting requirements: OSHA poster (Job Safety and Health: It's the Law), citations, and annual summary.
- Worker training must be provided in a language and manner the worker understands.
- Focus Four prevention hierarchy: elimination, engineering controls, administrative controls, PPE.
Field and Exam Application
- Conduct a daily safety huddle reviewing Focus Four hazards specific to the day's tasks.
- Use a pre-task hazard assessment checklist to identify fall, struck-by, caught-in, and electrocution risks.
- Implement a stop-work authority for any worker who identifies an imminent danger situation.
High-Yield Distinctions
- Fall protection trigger height: 6 feet in construction vs. 4 feet in general industry.
- Struck-by vs. caught-in: struck-by involves impact from an object in motion; caught-in involves being trapped or compressed.
- Electrocution vs. electric shock: electrocution is fatal; shock may be non-fatal but can cause injury.
Common Pitfalls
- Confusing fall protection requirements for different tasks (e.g., steel erection vs. roofing).
- Assuming hard hats are optional for non-overhead work; they are required where there is any risk of head injury.
- Overlooking caught-in hazards from rotating equipment or unguarded machinery.
Review Tasks
- Review OSHA's Focus Four fact sheets on osha.gov.
- Practice identifying Focus Four hazards in construction site photos.
- Memorize the fall protection trigger height and exceptions.
Personal Protective Equipment (PPE) and Site Health Hazards
Syllabus Focus
- 29 CFR 1926 Subpart E (PPE)
- Head, eye, face, hand, foot, and respiratory protection
- Hearing conservation and silica exposure
- Hazard communication (GHS labels, SDS)
Key Notes
- Employers must conduct a PPE hazard assessment (1926.95(d)).
- Hard hats must meet ANSI Z89.1; safety glasses meet ANSI Z87.1.
- Respiratory protection requires a written program, medical evaluation, fit testing, and training (1926.103).
- Silica standard (1926.1153): permissible exposure limit (PEL) of 50 µg/m³ over 8 hours; requires exposure control plan.
- Hearing conservation program triggered at 85 dBA TWA; requires audiometric testing and hearing protection.
- Hazard communication: chemical inventory, Safety Data Sheets (SDS), and labeling (GHS pictograms).
Must Know
- PPE must be provided at no cost to the worker (except for some exceptions like steel-toe boots if not required by employer).
- Eye and face protection required when there is risk from flying particles, molten metal, chemicals, or harmful light.
- Gloves: select based on chemical resistance, cut resistance, and dexterity needs.
- Respirator selection: air-purifying vs. atmosphere-supplying; must be NIOSH-approved.
Field and Exam Application
- Perform a PPE hazard assessment using the OSHA form or a site-specific checklist.
- Select appropriate respirator for silica dust: N95 filtering facepiece is not sufficient; use half-face elastomeric with P100 filters or better.
- Implement a hearing conservation program: baseline audiogram, annual testing, and training.
High-Yield Distinctions
- ANSI vs. OSHA: ANSI is a voluntary consensus standard; OSHA adopts it by reference for PPE performance.
- Supplied-air respirator (SAR) vs. self-contained breathing apparatus (SCBA): SAR uses a remote air source; SCBA carries its own air.
- Silica vs. asbestos: both cause lung disease but different standards; silica requires wet methods or local exhaust ventilation.
Common Pitfalls
- Assuming one type of glove protects against all chemicals; always check the SDS for chemical resistance.
- Using a dust mask (N95) for silica without a respirator program; it is not allowed for silica above the PEL.
- Forgetting to include PPE in the written hazard communication program.
Review Tasks
- Review the OSHA PPE hazard assessment guidelines.
- Practice reading an SDS to identify required PPE.
- Study the silica standard's Table 1 (specified exposure control methods).
Stairways, Ladders, and Scaffolding Systems
Syllabus Focus
- 29 CFR 1926 Subpart X (Stairways and Ladders)
- 29 CFR 1926 Subpart L (Scaffolding)
- Ladder types, load ratings, and inspection
- Scaffold erection, capacity, and fall protection
Key Notes
- Ladders must be inspected before each use; defective ladders must be tagged and removed.
- Portable ladders: extend 3 feet above the landing surface; set at a 4:1 angle (base to height ratio).
- Scaffold platforms must be fully planked (no more than 1 inch gaps) and capable of supporting 4 times the maximum intended load.
- Scaffolds over 10 feet require guardrails (toprail 42 inches, midrail 21 inches) or personal fall arrest system.
- Ladder rungs must be spaced uniformly (10-14 inches apart) and slip-resistant.
- Stairways with 4 or more risers or rising more than 30 inches must have handrails and stair rails.
Must Know
- Maximum ladder height: single ladder up to 30 feet; extension ladder up to 60 feet.
- Scaffold footing: must be on solid, level ground; use base plates and mud sills as needed.
- Never climb a ladder with tools in hand; use a tool belt or hoist line.
- Scaffold access: use ladders, stair towers, or ramps; never climb cross-bracing.
Field and Exam Application
- Set up a portable extension ladder: ensure 4:1 angle, extend 3 feet above roof edge, and secure at top and bottom.
- Inspect a scaffold before each shift: check for damage, missing guardrails, and proper bracing.
- Use a ladder leveler on uneven ground to maintain stability.
High-Yield Distinctions
- Type I ladder (heavy duty, 250 lbs) vs. Type IA (extra heavy duty, 300 lbs) vs. Type II (medium duty, 225 lbs).
- Scaffold guardrail height: 42 inches (toprail) ± 3 inches; midrail at 21 inches.
- Personal fall arrest system on scaffolds: anchor point must be independent of the scaffold structure.
Common Pitfalls
- Using a ladder on a scaffold to gain extra height; not allowed unless ladder is secured and scaffold is designed for it.
- Overloading a scaffold with materials and workers beyond its rated capacity.
- Climbing a ladder with wet or muddy boots; always clean boots before climbing.
Review Tasks
- Practice ladder setup and angle measurement using the 4:1 rule.
- Review scaffold inspection checklist from OSHA.
- Memorize guardrail and toeboard requirements for scaffolds.
Excavation, Trenching, and Soil Mechanics
Syllabus Focus
- 29 CFR 1926 Subpart P (Excavations)
- Soil classification (Type A, B, C)
- Protective systems: sloping, shoring, shielding
- Competent person requirements
Key Notes
- All excavations 5 feet or deeper require a protective system unless entirely in stable rock.
- Soil classification: Type A (cohesive, high strength), Type B (medium), Type C (granular, low strength).
- Competent person must inspect excavations daily, after rain, and after any hazard-increasing event.
- Sloping angles: Type A (53° from horizontal), Type B (45°), Type C (34°).
- Shielding (trench boxes) protects workers from cave-ins but does not prevent soil movement outside the box.
- Spoil piles must be at least 2 feet from the edge of the excavation.
Must Know
- Underground utility location: call 811 before digging; verify utility locations.
- Means of egress: ladders, ramps, or stairs required within 25 feet of workers in excavations 4 feet or deeper.
- Water accumulation: if water is present, a competent person must evaluate and control it.
- Atmospheric hazards: test for oxygen deficiency, flammable gases, and toxic fumes in excavations over 4 feet deep if hazardous atmosphere is possible.
Field and Exam Application
- Perform a soil classification test: thumb penetration test, pocket penetrometer, or visual-manual method.
- Set up a trench box: ensure it extends at least 18 inches above the surrounding soil.
- Conduct a daily inspection of an excavation: check for cracks, water, and spoil pile distance.
High-Yield Distinctions
- Sloping vs. shoring vs. shielding: sloping cuts soil back at an angle; shoring supports soil with bracing; shielding protects workers without preventing cave-in.
- Type A soil is the most stable; Type C is the least stable and requires the flattest slope.
- Competent person vs. qualified person: competent person identifies hazards and has authority to correct them; qualified person has specialized knowledge and training.
Common Pitfalls
- Assuming all soil is Type A; always perform a soil test.
- Placing spoil piles too close to the edge; minimum 2 feet, but may need more for deeper excavations.
- Using a trench box as a shield but not ensuring it is properly sized and installed.
Review Tasks
- Review the soil classification flow chart in Subpart P.
- Practice calculating slope angles for different soil types.
- Memorize the competent person duties for excavations.
Hand and Power Tool Safety and Guarding
Syllabus Focus
- 29 CFR 1926 Subpart I (Tools - Hand and Power)
- Guarding requirements for power tools
- Electrical safety for tools (GFCI, grounding)
- Pneumatic and powder-actuated tools
Key Notes
- Power tools must be equipped with guards (e.g., saw blade guards, chuck keys removed).
- All tools must be maintained in safe condition; defective tools must be tagged and removed.
- GFCI protection required for all 120-volt, single-phase, 15- and 20-ampere receptacles on construction sites (1926.404(b)(1)(ii)).
- Powder-actuated tools require operator training and must not be used in explosive atmospheres.
- Pneumatic tools must have a safety clip or retainer to prevent attachments from being ejected.
- Electric tools: double-insulated tools do not require grounding; non-double-insulated tools must be grounded.
Must Know
- Never remove or disable a guard on a power tool.
- Use the right tool for the job; do not use a tool for a purpose it was not designed for.
- Inspect tools before use: check cords, plugs, switches, and guards.
- Lockout/tagout (LOTO) required when servicing or maintaining tools and equipment (1926.417).
Field and Exam Application
- Set up a circular saw: ensure blade guard retracts properly and lower guard is functional.
- Use a GFCI tester to verify protection at a temporary power outlet.
- Conduct a daily tool inspection checklist for all hand and power tools on site.
High-Yield Distinctions
- Double-insulated tools: marked with a square-in-square symbol; no grounding prong needed.
- GFCI vs. assured equipment grounding conductor program (AEGCP): GFCI is preferred; AEGCP is an alternative for larger sites.
- Powder-actuated tool: must not be used on materials that could be penetrated (e.g., thin steel) or near edges.
Common Pitfalls
- Using a damaged cord without repair; replace or repair before use.
- Removing a guard to speed up work; never acceptable.
- Using a powder-actuated tool without checking for hidden utilities or rebar.
Review Tasks
- Review the OSHA hand and power tool safety checklist.
- Practice identifying double-insulated tools by their symbol.
- Study the lockout/tagout procedures for tool maintenance.
Material Handling, Storage, and Fire Protection
Syllabus Focus
- 29 CFR 1926 Subpart H (Materials Handling, Storage, Use, and Disposal)
- 29 CFR 1926 Subpart F (Fire Protection and Prevention)
- Rigging, cranes, and hoists (Subpart CC)
- Flammable and combustible liquids storage
Key Notes
- Materials must be stored in a manner that does not create a hazard; stacking must be stable and within load limits.
- Rigging equipment must be inspected before each use; damaged slings must be removed.
- Crane operator must be certified or qualified; cranes must be inspected daily and after assembly.
- Fire extinguishers: required in all construction areas; travel distance to extinguisher must not exceed 100 feet (Class A) or 50 feet (Class B).
- Flammable liquids: storage must be in approved containers; no more than 25 gallons in a room unless in a storage cabinet.
- Hot work (welding, cutting) requires a fire watch and permit in areas with fire hazards.
Must Know
- Crane hand signals: standard signals must be used; only one person gives signals.
- Sling angle factor: as the angle from vertical decreases, tension increases; use a tagline to control loads.
- Fire prevention plan: required when there are fire hazards; includes emergency procedures and training.
- Compressed gas cylinders: must be secured upright; oxygen and fuel gas cylinders must be separated by 20 feet or a non-combustible barrier.
Field and Exam Application
- Inspect a wire rope sling: check for broken wires, kinking, corrosion, and heat damage.
- Set up a flammable liquid storage cabinet: ensure it is labeled and self-closing doors are functional.
- Conduct a pre-lift meeting for crane operations: review load weight, rigging, and hand signals.
High-Yield Distinctions
- Rigging hardware: hooks must have safety latches; shackles must be properly sized and pinned.
- Fire extinguisher classification: A (ordinary combustibles), B (flammable liquids), C (electrical), D (combustible metals), K (cooking oils).
- Hot work permit vs. fire watch: permit authorizes the work; fire watch monitors for fire during and after work (30 minutes minimum).
Common Pitfalls
- Using a sling at too sharp an angle (less than 30° from vertical); reduces capacity significantly.
- Storing oxygen and acetylene cylinders together without a barrier or 20-foot separation.
- Blocking fire extinguishers with stored materials; keep access clear.
Review Tasks
- Review the crane hand signal chart from OSHA.
- Practice calculating sling tension for different angles.
- Memorize the fire extinguisher travel distance requirements.
How To Use These Notes With Practice Questions
Do not jump straight from reading to a full mock. Work by subject first: review the key notes, make a short recall sheet from memory, then answer a focused question set. After each miss, decide whether the problem was missing theory, weak code/source recall, poor measurement setup, calculation error, or a field sequence you did not visualize.
Technical Conquer's question bank, flashcards, mind maps, and spaced review tools are most useful after this instruction layer because they reveal which parts of the notes are not yet retrievable.
Final Review Checklist
- Review the Focus Four hazards and their prevention methods daily.
- Ensure you can identify the correct PPE for common construction tasks.
- Practice ladder and scaffold setup procedures until they become second nature.
- Understand soil classification and protective system selection for excavations.
- Know the guarding requirements for power tools and the importance of GFCI.
- Be familiar with crane hand signals and rigging inspection criteria.
- Review fire extinguisher types and locations, and hot work permit requirements.
- Use the official OSHA 29 CFR 1926 standards as your primary reference.
- Take practice quizzes to assess your knowledge of each subject area.
- Attend an authorized OSHA 10-hour training course for the official card.
Official Sources and Further Reading
Use these sources as the final authority for format, eligibility, rules, regulatory limits, and exam updates. Study notes are a preparation layer, not a replacement for official candidate guidance.