Section 2206 addresses fireproofing (fire protection) of structural steel members to maintain strength during fires. Concrete encasement (typically 2 inches) of steel provides fire protection while adding mass to columns and beams. Spray-applied fireproofing (mineral fiber or cementitious materials) is efficient and economical. Intumescent paints expand when heated, creating insulating char layers. Fire-resistant coatings can extend protection to thinner layers than mechanical fireproofing. All fireproofing must be applied in approved thickness to achieve required fire rating.