How Toeboards Prevent Struck-By Injuries

A struck-by injury happens when a falling tool, fitting or piece of debris hits a worker below a scaffold. Most falling objects leave a platform by rolling or being kicked off the edge. A toeboard at least 3-1/2 inches high, fastened at the outermost edge, blocks that path, which is why OSHA requires one on platforms more than 10 feet up.

What Is a Struck-By Injury?

A struck-by injury is an injury caused by the impact of an object alone. OSHA groups construction struck-by hazards into four types: flying, falling, swinging and rolling objects. On a scaffold, the falling object type is the one that reaches workers below: a wrench, a coupler, a bolt, a scrap of wood or a length of tie wire that leaves the platform edge.

OSHA’s Construction Focus Four: Struck-By Hazards instructor guide defines struck-by injuries as those “produced by forcible contact or impact between the injured person and an object or piece of equipment,” and separates them from caught-in events, where the injury comes from crushing between objects. Struck-by is one of the four hazards OSHA’s construction training program treats as leading causes of construction deaths, alongside falls, caught-in or between, and electrocution.

How Do Objects Fall From Scaffold Platforms?

Objects fall from scaffold platforms in a few repeatable ways: a tool set down near the edge rolls off, a worker’s boot kicks a fitting through the gap under a board, material stacked above the toeboard tips over it, or debris left on the deck gets swept off. Each path crosses the platform edge at deck level or just above it.

That is why the edge matters so much. A bolt on a steel plank does not need much of a push to travel to the edge, and a toeboard that sits 1/2 inch off the deck lets it slide straight under. The OSHA construction eTool on struck-by hazards puts it plainly: workers are at risk from falling objects when they are beneath cranes and scaffolds, and the listed controls are toeboards, screens or guardrails on scaffolds, debris nets, hard hats, and securing tools and materials.

How Much Force Does a Falling Tool Carry?

A falling object gains speed fast. Ignoring air resistance, anything dropped 30 feet reaches about 44 feet per second, roughly 30 miles per hour, before it lands. A 2 pound wrench falling that distance carries about 60 foot-pounds of energy, delivered to a point the size of the wrench’s head.

Those figures come from basic physics (speed equals the square root of 2 times gravity times height), not from injury data, and they show why small items matter. A worker below cannot see a socket coming, and a hard hat is designed to take a blow from above, not to make a falling object harmless. This is the gap the toeboard closes: the object never leaves the platform.

How Many Workers Are Killed by Falling Objects?

The Bureau of Labor Statistics counted 282 fatal work injuries in the United States in 2024 from being struck by a falling object, across all industries. Those deaths sit inside a wider category, struck by a propelled, falling or suspended object, which totaled 357 that year.

Both figures come from the BLS Census of Fatal Occupational Injuries, in the 2024 event drilldown chart and Table 2 of the 2024 release. They count every falling object in every industry, including loads, trees and structures, so they are not a count of scaffold drops. For more context on what these numbers do and do not show, see dropped object statistics.

What Does OSHA Require to Protect Workers Below a Scaffold?

OSHA requires falling object protection on any scaffold where tools, materials or equipment could fall and strike employees below. The employer picks from a list: barricade the area below and keep people out, install a toeboard on platforms more than 10 feet up, add screening where material is piled higher than the toeboard, use a guardrail with small enough openings, or erect a canopy, debris net or catch platform.

The rule is 29 CFR 1926.451(h). Paragraph (h)(1) also makes clear that this protection is “in addition to wearing hardhats,” and head protection itself is required wherever there is a possible danger of head injury from falling objects under 29 CFR 1926.100(a). Where an object is too large or heavy for any of those measures to contain, (h)(1) requires it to be kept away from the edge and secured. The full list of options is covered in toeboards, screens and canopies explained.

How Does a Toeboard Stop a Falling Object?

A toeboard stops falling objects by closing the strip between the deck and the guardrail where tools and debris roll or slide off. It has to be tall enough to catch them, tight enough to the deck that nothing slips underneath, solid enough that small parts cannot pass through, and strong enough to take a kick or a dropped load without letting go.

29 CFR 1926.451(h)(4) turns each of those jobs into a number:

Requirement	What it stops	Citation
At least 3-1/2 in high	Tools and fittings rolling over the edge	1926.451(h)(4)(ii)
No more than 1/4 in above the deck	Bolts and debris sliding under the board	1926.451(h)(4)(ii)
Solid, or openings no larger than 1 in	Small parts passing through	1926.451(h)(4)(ii)
Withstands 50 lb downward or horizontal	A kicked tool or a worker’s boot knocking it loose	1926.451(h)(4)(i)
Securely fastened at the outermost edge	The board itself becoming a falling object	1926.451(h)(4)(ii)

29 CFR 1926.502(j) repeats the same height, clearance, opening and 50 pound figures for toeboards on other walking and working surfaces. The detail behind each number is in what OSHA requires for scaffold toeboards.

Why Do Toeboards Fail to Prevent Struck-By Injuries?

Toeboards fail when the installed board no longer meets the numbers. The common failures are a gap that opens above the deck as wire stretches, a board knocked loose or removed for access and never replaced, a corner left open where two runs meet, and material stacked above the board with no screening behind it.

Each failure reopens a path for objects to leave the platform. Tie wire is a frequent cause, because it loosens under vibration and its cut ends become debris during teardown, as covered in the hazards of tie wire on scaffolds. The control is inspection: 29 CFR 1926.451(f)(3) requires a competent person to inspect the scaffold for visible defects before each work shift and after any occurrence that could affect its structural integrity, and that walk should include every toeboard.

How Can Crews Reduce Struck-By Risk Below a Scaffold?

Crews reduce struck-by risk by stacking controls. Keep tools tethered and away from the edge, keep the deck clear of debris, fit toeboards that meet the 1926.451(h)(4) numbers on every exposed edge, add screening where material sits above the board, barricade the drop zone below, and keep hard hats on everyone underneath.

No single control covers every object. Tethers stop the tool you are holding; the toeboard stops the one you set down; the barricade keeps people out of the zone if both fail. A shift-start routine that checks all of them is laid out in the scaffold safety checklist for falling objects.

Fastening is where many toeboards lose their grip. Diamond Deck is a steel bracket that clamps to the scaffold post and holds two toeboards without tie wire or nails. It is designed to the toeboard requirements of 29 CFR 1926.451(h)(4); load testing is in progress. To get specifications and lead times for your project, request a quote.