Our family room is currently being remodeled to include a raised/tray ceiling. Once the drywall was removed from the ceiling and the plywood removed from the attic floor above the family room, it was discovered that a LOT of wiring was going down the center of the room and had to be relocated. The electricians 'relocated' the wiring by adding 20-30 plastic junction boxes in the floor of the attic and covering them with solid, plastic covers. The attic was and will be re-floored with plywood and the space will eventually be used as livable space.
Are plastic junction boxes and plastic box covers appropriate for a floor? If not, what should have been used? Is this method of rewiring (using junction boxes) safe?