If you manage safety on a construction site, four categories of hazard deserve more of your attention than any others. OSHA calls them the “Fatal Four,” and for a straightforward reason: year after year, they account for the majority of construction worker deaths. Understanding them isn’t academic — it shapes where you focus your hazard recognition, your controls, and, just as importantly, the record you keep of both.
The four are falls, struck-by incidents, caught-in or caught-between incidents, and electrocution. Below, we walk through what each one actually covers on a real jobsite, the OSHA standards most closely tied to them, and why documenting your recognition of these hazards matters as much as recognizing them.
1. Falls (29 CFR 1926 Subpart M)
Falls from height are consistently the single largest cause of construction fatalities. They happen at leading edges, on scaffolds, through floor and roof openings, off ladders, and from elevated work platforms. The controlling standard, Subpart M, sets the threshold at which fall protection is generally required and defines the acceptable systems — guardrails, safety nets, and personal fall arrest. But the standard is only half the story on-site. What a reviewer or an investigator asks after the fact is: what conditions were present, what hazards were recognized, and what controls were documented against them?
2. Struck-By
Struck-by hazards involve a worker being hit by a moving object — a vehicle, falling material, a swinging load, or a flying particle. They range from a dropped tool at height to a backing dump truck. Because struck-by hazards are so situational, they reward specific, condition-based recognition rather than generic checklists.
3. Caught-In or Caught-Between
These incidents involve a worker crushed, pinned, or caught in equipment, collapsing material, or between two objects. Trench collapses and unguarded machinery are classic examples. The energy involved is often invisible until it’s released — which is exactly why documented recognition and controls carry weight.
4. Electrocution
Contact with overhead power lines, unsafe equipment, and improper wiring drives this category. It overlaps heavily with hazardous energy control, which is why lockout/tagout documentation sits so close to Fatal Four work.
Why Documentation Is the Piece That Gets Missed
Here’s the pattern we see repeatedly: the work gets talked through, hazards get considered, and decisions get made by the people responsible for making them. What goes missing is the record — the clear account of what was reviewed, what was selected, and what was relied on. Recognition that lives only in someone’s head, or in an illegible field note, is hard to stand behind later.
A structured Fatal Four documentation framework doesn’t make the safety decision for you — your competent person still recognizes the hazard, and your employer still authorizes the work. What it does is turn that real judgment into a clear, consistent record that holds up when someone asks, later, what actually happened.
Compliance Crucible tools are documentation frameworks. They do not certify compliance, authorize work, or replace competent-person judgment.
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