The underside of the body, including floor members and the side panels below the floor, shall be coated with a fire-resistant undercoating material applied by the spray method so as to seal, insulate, reduce corrosion, and reduce interior noise. Non-metallic components need not be coated.
Ill. Admin. Code tit. 92, § 442.300
Amended at 26 Ill. Reg. 3255, effective February 19, 2002