Wash. Admin. Code § 296-874-20010
You must make sure scaffold platforms meet the minimum width requirements of Table 1, Minimum Platform Width.
Table 1
Minimum Platform Width
| Type of Scaffold | Minimum Platform Width Required |
| Ladder jack scaffoldPump jack scaffold | 12 inches (20 cm) |
| Roof bracket scaffoldTop plate bracket scaffold | |
| Boatswain's chair | No minimum width |
| All other scaffolds | 18 inches (46 cm) |
| Exemption: | |
| Platforms and walkways may be less than 18 inches (46 cm) wide if all of the following are met: | |
| 1. You can demonstrate that the area is so narrow that the platform or walkway cannot be at least 18 inches (46 cm) wide; | |
| 2. The platform or walkway is as wide as feasible; | |
| 3. Employees on those platforms or walkways are protected from falling by using guardrails or personal fall arrest systems. |
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-874-20010, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 05-01-054, § 296-874-20010, filed 12/7/04, effective 3/1/05.]