# toprail-maximum-height-supported-before-2000-and-suspended — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For toprail-maximum-height-supported-before-2000-and-suspended, paragraph citation is 1926.451(g)(4)(ii); type of requirement is maximum height; value (imperial) is 45 inches; value (metric) is 1.2 m; applies to is supported scaffolds manufactured and placed in service before January 1, 2000, and on all suspended scaffolds where both a guardrail and a personal fall arrest system are required, recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** toprail-maximum-height-supported-before-2000-and-suspended _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(g)(4)(ii) _(our reading, not quoted from the source)_
- **Type of requirement:** maximum height _(our reading, not quoted from the source)_
- **Value (imperial):** 45 inches _(verified: appears in the quote below)_
- **Value (metric):** 1.2 m _(verified: appears in the quote below)_
- **Applies to:** supported scaffolds manufactured and placed in service before January 1, 2000, and on all suspended scaffolds where both a guardrail and a personal fall arrest system are required _(verified: appears in the quote below)_
- **Regulation section heading:** Fall protection _(verified: appears in its own passage below)_

## What the source says

> The top edge height on supported scaffolds manufactured and placed in service before January 1, 2000, and on all suspended scaffolds where both a guardrail and a personal fall arrest system are required shall be between 36 inches (0.9 m) and 45 inches (1.2 m).

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Regulation section heading

> (g) Fall protection.

## Source

- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-L/section-1926.451

Last verified: 2026-09-14. Review by: 2027-08-31.
Part of [Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)](https://referencesource.org/osha-scaffold-dimensional-tolerances/).