Construction Safety - Floor Openings Unprotected holes in the floor, deck or roof have been responsible for a number of very serious injuries. Yet, through planning and personal attention, falls through openings under foot are easy to prevent. If you make a hole, guard it. Before cutting the hole, barricade the work area to keep people out. If the hole must be open, install permanent barricades around the perimeter. Like railings around the edge of a building or stairwell, these should be a minimum of forty-two inches high, have a mid-rail and be capable of withstanding a 200-pound load. Toe boards are...