In buildings or other structures of wood floor construction, the under-flooring shall be laid on each tier of joists as the structure progresses, or if double floors are not to be used, the tier of joists next below where work is being performed shall be entirely floored over except for such spaces as are required for ladders and shaftways.
Or. Admin. Code § 437-003-0905
Stat. Auth.: ORS 654.025(2) & ORS 656.726(3)
Stats. Implemented: ORS 654.001 - 654.295