Audit log

Based on the provided excerpts, the required guardrail toprail height depends on the scaffold type and date of manufacture/service:

- Supported scaffolds manufactured or placed in service after January 1, 2000: The top edge height shall be installed between 38 inches (0.97 m) and 45 inches (1.2 m) above the platform surface. [OSHA 3150 Scaffold Guide, Sec E, p.42]

- Supported scaffolds manufactured and placed in service before January 1, 2000, and all suspended scaffolds where both a guardrail and a personal fall arrest system are required: The top edge height shall be between 36 inches (0.9 m) and 45 inches (1.2 m). [OSHA 3150 Scaffold Guide, Sec E, p.42]

- Exception: When conditions warrant, the height of the top edge may exceed the 45-inch height, provided the guardrail system meets all other criteria of paragraph (g)(4). [OSHA 3150 Scaffold Guide, Sec E, p.42]

Additionally, when cross bracing is used as a toprail, the crossing point must be between 38 inches (0.97 m) and 48 inches (1.3 m) above the work platform, and the end points at each upright shall be no more than 48 inches (1.3 m) apart. [OSHA 3150 Scaffold Guide, Sec E, p.43]