OSHA 1926 Subpart M · Fall protection
OSHA Fall Protection Requirements Chart
Construction fall protection trigger heights by activity — 6 ft general, 10 ft scaffolds, 15/30 ft steel erection, 24 ft fixed ladders — plus guardrail, personal fall arrest, safety net, hole cover, and warning line specs from 29 CFR 1926.
Fall protection trigger heights by activity — 29 CFR 1926
| Activity / surface | Trigger | Acceptable protection | Citation |
|---|---|---|---|
| Unprotected sides & edges (general) | 6 ft or more | Guardrail, safety net, or PFAS | 1926.501(b)(1) |
| Leading edge work | 6 ft or more | Guardrail, net, PFAS (or fall protection plan if infeasible) | 1926.501(b)(2) |
| Hoist areas | 6 ft or more | Guardrail or PFAS (PFAS if leaning out through opening) | 1926.501(b)(3) |
| Holes & skylights — falling through | More than 6 ft | PFAS, covers, or guardrail around hole | 1926.501(b)(4)(i) |
| Holes — tripping/stepping in, falling objects | Any height | Covers | 1926.501(b)(4)(ii)–(iii) |
| Face of formwork / reinforcing steel | 6 ft or more | PFAS, safety net, or positioning device | 1926.501(b)(5) |
| Ramps, runways, walkways | 6 ft or more | Guardrail | 1926.501(b)(6) |
| Excavation edge (not readily seen) | 6 ft or more deep | Guardrail, fence, or barricade | 1926.501(b)(7)(i) |
| Wells, pits, shafts | 6 ft or more deep | Guardrail, fence, barricade, or cover | 1926.501(b)(7)(ii) |
| Above dangerous equipment | Less than 6 ft | Guardrail or equipment guards | 1926.501(b)(8)(i) |
| Above dangerous equipment | 6 ft or more | Guardrail, PFAS, or safety net | 1926.501(b)(8)(ii) |
| Overhand bricklaying | 6 ft or more | Guardrail, net, PFAS, or controlled access zone | 1926.501(b)(9)(i) |
| Bricklaying — reaching below surface | More than 10 in below | Guardrail, net, or PFAS | 1926.501(b)(9)(ii) |
| Low-slope roofing | 6 ft or more | Guardrail, net, PFAS, or warning line + one of those / safety monitor | 1926.501(b)(10) |
| Low-slope roof 50 ft or less wide | 6 ft or more | Safety monitoring system alone permitted | 1926.501(b)(10) |
| Steep roofs | 6 ft or more | Guardrail with toeboards, net, or PFAS | 1926.501(b)(11) |
| Precast concrete erection | 6 ft or more | Guardrail, net, PFAS (or fall protection plan if infeasible) | 1926.501(b)(12) |
| Residential construction | 6 ft or more | Guardrail, net, PFAS (or fall protection plan if infeasible) | 1926.501(b)(13) |
| Wall openings | Outside bottom edge 6 ft+, inside bottom edge under 39 in | Guardrail, net, or PFAS | 1926.501(b)(14) |
| Any other walking/working surface | 6 ft or more | Guardrail, net, or PFAS | 1926.501(b)(15) |
| Scaffolds (Subpart L) | More than 10 ft | Guardrail and/or PFAS by scaffold type | 1926.451(g)(1) |
| Aerial lifts (boom-supported) | Any height | Lanyard attached to boom or basket | 1926.453(b)(2)(v) |
| Steel erection — general (Subpart R) | More than 15 ft | Guardrail, net, PFAS, positioning, or fall restraint | 1926.760(a)(1) |
| Steel erection — connectors | More than 2 stories or 30 ft, whichever is less | Full protection per 760(a)(1); tie-off equipment provided/worn over 15 to 30 ft | 1926.760(b) |
| Steel erection — controlled decking zone | Over 15 up to 30 ft | CDZ allowed; protect leading-edge workers above 2 stories or 30 ft | 1926.760(c) |
| Fixed ladders — climb length | 24 ft or more total climb | Ladder safety device; SRL + rest platforms; or cage/well with sections | 1926.1053(a)(19) |
| Fixed ladders — shorter climb, high top | Climb under 24 ft but top over 24 ft above lower level | Cage, well, ladder safety device, or SRL | 1926.1053(a)(18) |
| Access between levels | Break in elevation of 19 in or more | Stairway or ladder (unless ramp, runway, embankment, or hoist) | 1926.1051(a) |
Subpart M (1926.501) does not govern scaffolds, cranes and derricks, steel erection, certain tunneling equipment, tank and tower erection, Subpart V power line work from aerial lifts/poles/towers, or stairways and ladders — those have their own subparts (1926.500(a)(2)). Subpart M also does not apply to inspections or assessments before construction starts or after it is complete (1926.500(a)(1)).
Guardrail systems — 1926.502(b)
| Requirement | Value | Citation |
|---|---|---|
| Top rail height | 42 in ± 3 in (39–45 in) above walking/working level | 1926.502(b)(1) |
| Top rail on stilts | Raise by the height of the stilts | 1926.502(b)(1) note |
| Midrail / intermediate members required | When no wall or parapet at least 21 in high | 1926.502(b)(2) |
| Midrail height | Midway between top edge and walking/working level | 1926.502(b)(2)(i) |
| Intermediate vertical members (balusters) | Not more than 19 in apart | 1926.502(b)(2)(iii) |
| Other openings in the system | Not more than 19 in wide | 1926.502(b)(2)(iv) |
| Top rail strength | 200 lb within 2 in of top edge, outward or downward | 1926.502(b)(3) |
| Top rail deflection under 200 lb | Not below 39 in above walking/working level | 1926.502(b)(4) |
| Midrail / screen / panel strength | 150 lb, downward or outward | 1926.502(b)(5) |
| Rail size | At least ¼ in nominal diameter or thickness | 1926.502(b)(9) |
| Wire rope top rail | Flagged at not more than 6 ft intervals | 1926.502(b)(9) |
| Banding | Steel or plastic banding not allowed as top rail or midrail | 1926.502(b)(8) |
| Holes used for passing materials | Removable guardrail on no more than 2 sides | 1926.502(b)(12) |
| Ladderway / access holes | Gate or offset so no one walks directly in | 1926.502(b)(13) |
| Toeboards (as falling object protection) | Min 3½ in high, max ¼ in gap at bottom, 50 lb, openings ≤ 1 in | 1926.502(j)(2)–(3) |
Scaffold guardrails follow 1926.451(g)(4) instead: 38–45 in top rail on supported scaffolds placed in service after January 1, 2000 (36–45 in for older supported scaffolds and for suspended scaffolds where both a guardrail and PFAS are required).
Personal fall arrest systems (PFAS) — 1926.502(d)
| Requirement | Value | Citation |
|---|---|---|
| Anchorage strength | 5,000 lb per employee attached, OR designed with a safety factor of at least 2 under a qualified person | 1926.502(d)(15) |
| Anchorage independence | Independent of any anchorage supporting or suspending platforms | 1926.502(d)(15) |
| Maximum free fall | 6 ft, and no contact with any lower level | 1926.502(d)(16)(iii) |
| Maximum deceleration distance | 3.5 ft | 1926.502(d)(16)(iv) |
| Maximum arresting force — body harness | 1,800 lb (8 kN) | 1926.502(d)(16)(ii) |
| Maximum arresting force — body belt | 900 lb (4 kN) — belts barred from PFAS since Jan 1, 1998 | 1926.502(d)(16)(i) |
| System strength | Twice the impact energy of a 6 ft free fall (or the permitted free fall, if less) | 1926.502(d)(16)(v) |
| D-rings & snaphooks | 5,000 lb min tensile; proof-tested to 3,600 lb | 1926.502(d)(3)–(4) |
| Snaphooks | Locking type only (since Jan 1, 1998) | 1926.502(d)(5) |
| Lanyards & vertical lifelines | 5,000 lb min breaking strength | 1926.502(d)(9) |
| Vertical lifelines | One employee per lifeline (elevator shaft false-car exception) | 1926.502(d)(10) |
| Horizontal lifelines | Designed/installed under a qualified person, safety factor of 2 | 1926.502(d)(8) |
| SRLs limiting free fall to 2 ft or less | 3,000 lb min tensile, fully extended | 1926.502(d)(12) |
| Other SRLs, ripstitch & tearing lanyards | 5,000 lb min tensile, fully extended | 1926.502(d)(13) |
| Harness attachment point | Center of back near shoulder level, or above the head | 1926.502(d)(17) |
| Weight basis (Appendix C criteria) | Combined person + tools under 310 lb | 1926.502(d)(16) note |
| Not allowed to attach to | Guardrail systems or hoists (except as other subparts allow) | 1926.502(d)(23) |
| After a fall | Remove from service until a competent person inspects | 1926.502(d)(19) |
| Rescue | Prompt rescue, or employees able to self-rescue | 1926.502(d)(20) |
| Inspection | Before each use | 1926.502(d)(21) |
Positioning device systems (1926.502(e)): rigged for no more than 2 ft of free fall; anchorage of at least twice the potential impact load or 3,000 lb, whichever is greater; connecting assemblies 5,000 lb.
Safety net systems — 1926.502(c)
| Vertical distance, working level to net | Minimum horizontal distance, edge of working surface to outer edge of net |
|---|---|
| Up to 5 ft | 8 ft |
| More than 5 ft up to 10 ft | 10 ft |
| More than 10 ft | 13 ft |
Also per 1926.502(c): net as close as practicable under the work, never more than 30 ft below; drop test — 400 lb sandbag, 30 ± 2 in diameter, from the highest working surface but not less than 42 in above it — after installation, relocation, major repair, and every 6 months in place (or a competent-person certification record when a drop test is unreasonable); inspect at least weekly; mesh openings max 36 sq in and 6 in on any side; border rope 5,000 lb min; panel connections spaced not more than 6 in apart; remove debris before the next shift.
Covers, warning lines, controlled access zones & safety monitors — 1926.502(f)–(i)
| Item | Requirement | Citation |
|---|---|---|
| Hole cover — roadways / vehicle aisles | Support at least 2× max axle load of largest vehicle expected | 1926.502(i)(1) |
| Hole cover — all others | Support at least 2× weight of workers, equipment & materials on it | 1926.502(i)(2) |
| Hole cover — securing | Secured against displacement by wind, equipment, or employees | 1926.502(i)(3) |
| Hole cover — marking | Color coded or marked "HOLE" or "COVER" | 1926.502(i)(4) |
| Warning line — no mechanical equipment | Not less than 6 ft from roof edge | 1926.502(f)(1)(i) |
| Warning line — mechanical equipment | 6 ft from edges parallel to travel; 10 ft from edges perpendicular to travel | 1926.502(f)(1)(ii) |
| Warning line height | Lowest point (incl. sag) ≥ 34 in; highest point ≤ 39 in | 1926.502(f)(2)(ii) |
| Warning line flagging | High-visibility material at not more than 6 ft intervals | 1926.502(f)(2)(i) |
| Warning line stanchions | Resist 16 lb horizontal at 30 in high, toward the edge, without tipping | 1926.502(f)(2)(iii) |
| Warning line strength | 500 lb min tensile | 1926.502(f)(2)(iv) |
| CAZ control line — leading edge | 6 ft to 25 ft from the unprotected/leading edge | 1926.502(g)(1)(i) |
| CAZ control line — precast erection | 6 ft to 60 ft or half the member length, whichever is less | 1926.502(g)(1)(ii) |
| CAZ control line — overhand bricklaying | 10 ft to 15 ft from working edge | 1926.502(g)(2)(i) |
| CAZ control line height | 39 in min to 45 in max (50 in max for overhand bricklaying) | 1926.502(g)(3)(ii) |
| CAZ control line strength | 200 lb min breaking strength; flagged at ≤ 6 ft | 1926.502(g)(3) |
| Safety monitor | Competent person, same surface, within sight and voice range, no other duties | 1926.502(h)(1) |
| Roofing material storage | Not within 6 ft of roof edge unless guardrails are up | 1926.502(j)(7)(i) |
| Bricklaying material storage | Only masonry and mortar within 4 ft of working edge | 1926.502(j)(6)(i) |
Worked examples — which trigger applies?
| Situation | Trigger / rule | What you need |
|---|---|---|
| Electrician pulling wire on a 7 ft mezzanine edge | 6 ft — 1926.501(b)(1) | Guardrail, net, or PFAS |
| Same crew on a frame scaffold platform 8 ft up | 10 ft — 1926.451(g)(1) | Not yet required by Subpart L (below 10 ft); follow site rules |
| Steel connector setting beams 20 ft up (not above 2 stories) | Over 15 up to 30 ft — 1926.760(b)(3) | PFAS, positioning, or restraint provided and worn, ready to tie off |
| Steel connector setting beams 34 ft up | More than 30 ft — 1926.760(b)(1) | Full protection per 1926.760(a)(1) |
| Worker in SRL rated to hold free fall to 2 ft | 1926.502(d)(12) | Device must hold 3,000 lb fully extended |
| Harness + 6 ft shock-absorbing lanyard, anchor at foot level | 6 ft free fall max — 1926.502(d)(16)(iii) | Foot-level anchor lets free fall exceed 6 ft — re-rig to overhead anchor |
| Roofers on a 40 ft wide low-slope roof | 1926.501(b)(10) | Safety monitoring system alone is permitted (roof ≤ 50 ft wide) |
Free-fall and clearance math depends on the actual equipment — always check the manufacturer's required fall clearance for the lanyard or SRL in use.
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Reading OSHA's construction fall protection rules
Falls are the leading cause of construction deaths and fall protection (1926.501) is consistently one of OSHA's most-cited standards. The core rule is simple — 6 feet to a lower level triggers protection under 1926.501 — but the trigger changes by subpart. Start by asking what is the worker standing on and what are they doing: a scaffold is Subpart L (10 ft), structural steel is Subpart R (15 ft, 30 ft/two stories for connectors), ladders and stairs are Subpart X, and power line work from poles, towers, and aerial lifts is Subpart V.
Once protection is required, 1926.502 sets the performance specs. For guardrails the numbers to remember are 42 ± 3 in, 200 lb top rail, 150 lb midrail, and no opening over 19 in. For personal fall arrest: 5,000 lb anchorage (or a qualified-person design with a 2:1 safety factor), 6 ft maximum free fall, 3.5 ft maximum deceleration, and 1,800 lb maximum arresting force with a harness. Don't forget the clearance below — a PFAS that "works" but lets the worker hit the level below is non-compliant.
Leading edge, precast, and residential work may use a written, site-specific fall protection plan (1926.502(k)) only when the employer can show conventional protection is infeasible or creates a greater hazard — OSHA presumes it is feasible. Holes need covers at any height to prevent tripping and falling objects, and covers must be secured and marked "HOLE" or "COVER".
Put the trigger, system, anchorage, and rescue plan in the JSA or JHA, cover it in a toolbox talk, and check guardrails, covers, and harnesses on the safety inspection checklist. Ladder details are on the OSHA ladder requirements chart. Field PM Safety keeps JSAs, inspections, and incident reports on every job.
Values verified against the current eCFR text of 29 CFR 1926.451, 1926.453, 1926.500–.502, 1926.760, 1926.1051, and 1926.1053 (September 2026). OSHA sets the legal minimum; state-plan states (e.g. Cal/OSHA) and project or owner rules can be stricter. Verify against the current regulation and your site requirements.
FAQ
At what height is fall protection required in construction?+
The general OSHA construction trigger is 6 feet (1926.501(b)(1)) for unprotected sides and edges, leading edges, holes, roofs, formwork, and most other walking/working surfaces. Exceptions with their own triggers: scaffolds more than 10 feet (1926.451(g)(1)), steel erection more than 15 feet (1926.760(a)(1)) with connectors and controlled decking zones protected above two stories or 30 feet, and fixed ladders with a climb of 24 feet or more (1926.1053(a)(19)).
How high does an OSHA guardrail need to be?+
Under 1926.502(b)(1), the top rail must be 42 inches plus or minus 3 inches (39 to 45 inches) above the walking/working level, withstand 200 pounds applied within 2 inches of the top edge, and not deflect below 39 inches under that load. A midrail goes midway when there is no wall or parapet at least 21 inches high, and must withstand 150 pounds. Scaffold guardrails follow 1926.451(g)(4) (38 to 45 inches on newer supported scaffolds).
What are the OSHA personal fall arrest system limits?+
Per 1926.502(d)(16), a PFAS must limit free fall to 6 feet with no contact with a lower level, limit deceleration distance to 3.5 feet, and limit maximum arresting force to 1,800 pounds with a body harness. Anchorages must hold 5,000 pounds per employee attached or be designed with a safety factor of two under a qualified person (1926.502(d)(15)). Body belts have not been allowed in fall arrest since January 1, 1998.
How far must a safety net extend beyond the work edge?+
Per 1926.502(c)(2): 8 feet when the net is up to 5 feet below the working level, 10 feet when it is more than 5 up to 10 feet below, and 13 feet when it is more than 10 feet below. The net may never be more than 30 feet below the working surface.
How far from the roof edge does a warning line go?+
Per 1926.502(f)(1): at least 6 feet from the roof edge when no mechanical equipment is used. With mechanical equipment, 6 feet from edges parallel to the direction of equipment travel and 10 feet from edges perpendicular to it. The line must sag no lower than 34 inches and be no higher than 39 inches, flagged at 6-foot intervals.
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