Or. Admin. R. 437-003-1754
Roof and floor holes and openings shall be decked over. Where large size configuration or other structural design does not allow openings to be decked over (such as elevator shafts, stairwells, etc.) employees shall be protected by covers or guardrail systems erected around such openings as soon as the openings are created.
ORS 654.025(2) & 656.726(4)
ORS 654.001 - 654.295
OSHA 8-2003, f. 12-30-03 cert. ef. 1-1-04