General industry and construction, side by side
The same question has two answers because OSHA writes two sets of rules. A shop, plant, warehouse or office follows 29 CFR part 1910. A construction jobsite follows 29 CFR part 1926.
| Topic | General industry (29 CFR 1910) | Construction (29 CFR 1926) |
|---|---|---|
| Top rail height | The top edge height of top rails, or equivalent members, is 42 inches, plus or minus 3 inches, above the walking-working surface. The top edge height may exceed 45 inches if the system meets all the other criteria.29 CFR 1910.29(b)(1) | The top edge height shall be 42 inches plus or minus 3 inches above the walking/working level. When employees are using stilts, the top edge height is increased by the height of the stilts.29 CFR 1926.502(b)(1) |
| Midrails and openings | Midrails, screens, mesh, intermediate vertical members or equivalent members are installed between the surface and the top edge, unless there is a wall or parapet at least 21 inches high. Midrails sit midway, and openings between members are no wider than 19 inches.29 CFR 1910.29(b)(2) | Midrails, screens, mesh or equivalent members shall be installed when there is no wall or parapet wall at least 21 inches high. Midrails sit midway, balusters are not more than 19 inches apart, and no opening is more than 19 inches wide.29 CFR 1926.502(b)(2) |
| Strength of the top rail | Guardrail systems withstand, without failure, a force of at least 200 pounds applied in a downward or outward direction within 2 inches of the top edge, at any point along the top rail.29 CFR 1910.29(b)(3) | Guardrail systems shall withstand, without failure, a force of at least 200 pounds applied within 2 inches of the top edge, in any outward or downward direction, at any point along the top edge.29 CFR 1926.502(b)(3) |
| Deflection under that load | With the 200-pound load applied downward, the top rail does not deflect to a height of less than 39 inches above the walking-working surface.29 CFR 1910.29(b)(4) | With the 200-pound load applied downward, the top edge of the guardrail shall not deflect to a height less than 39 inches above the walking/working level.29 CFR 1926.502(b)(4) |
| Toeboards when used against falling objects | Toeboards are at least 3.5 inches high from their top edge to the walking-working surface, with no more than 0.25 inch of clearance above it.29 CFR 1910.29(k)(1) | Toeboards shall be a minimum of 3 1/2 inches high, with not more than 1/4 inch of clearance above the walking/working surface, and solid or with openings not over 1 inch in greatest dimension.29 CFR 1926.502(j)(3) |
What is OSHA's rule and what is not
| Level | What it says |
|---|---|
| OSHA requirement | The two parts give the same numbers for the top rail: 42 inches plus or minus 3 inches, 200 pounds, 39 inches after deflection. They are two separate rules, and a citation names the part that applies to the work.29 CFR 1910.29(b) and 29 CFR 1926.502(b) |
| Recommended practice | Checking guardrails on a schedule, and after anything strikes them, is the employer's own routine. The paragraphs ask only that rope used as a rail be inspected as often as necessary. A written schedule for the rest is recommended, not required.29 CFR 1910.29(b)(15) and 29 CFR 1926.502(b)(15) |
Does your state do it differently?
Some states run their own State Plan and write their own text, so the federal paragraphs above describe federal OSHA states. Look up your state on the State Plans page and read its rule before you rely on the federal wording.
What OSHA cited most under these standards in FY2025
| Paragraph | What it covers | FY2025 citations |
|---|---|---|
| 1910.29(b)(1) | Top rail height of 42 inches, plus or minus 3 | 93 |
| 1910.29(b)(2) | Midrails or equivalent intermediate members | 63 |
| 1910.29(b)(2)(i) | Midrail midway between the top edge and the surface | 44 |
| 1910.29(f)(4) | Openings in stair rails | 26 |
| 1910.29(b)(3) | Withstands 200 pounds at the top rail | 21 |
| 1910.29(b)(13)(i) | 13 |
1910.29: 347 citations in FY2025 at 278 inspections, 37 of them at construction sites (NAICS 23). Citation items issued Oct 1, 2024 to Sep 30, 2025, counted by HazComFast on U.S. Department of Labor enforcement data (extracted Oct 13, 2026). Inspected establishments, not the whole industry.
Mistakes that turn up in inspections
- Mounting the top rail by eye. A rail more than 3 inches below 42 inches is outside the range, and a rail that gives under a 200-pound push to below 39 inches fails the deflection test.29 CFR 1910.29(b)(1), 29 CFR 1910.29(b)(4) and 29 CFR 1926.502(b)(4)
- Leaving openings wider than 19 inches between posts when the wall or parapet is lower than 21 inches.29 CFR 1910.29(b)(2) and 29 CFR 1926.502(b)(2)
- Using steel or plastic banding for a top rail or midrail. Neither part allows it. Rope used as a rail is inspected as often as necessary to confirm it still meets the strength rules.29 CFR 1910.29(b)(8), 29 CFR 1910.29(b)(15), 29 CFR 1926.502(b)(8) and 29 CFR 1926.502(b)(15)
- Forgetting stilts. In construction the top edge goes up by the height of the stilts.29 CFR 1926.502(b)(1)
Free tool
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