WAC 296-874-20054. Provide fall protection if a scaffold is too far from the work face

You must provide a guardrail system along the front edge of the platform, or have employees use a personal fall arrest system, if the distance from the front edge of the platform to the work face is greater than: (1) Eighteen inches (46 cm) for scaffolds used for plastering and lathing operations; (2) Fourteen inches (36 cm) for all other scaffolds.