KKK-B-1579B
3.5.2 Construction. Body and roof framing shall be constructed of steel sections, with
metal panels attached outside and inside and properly insulated. All parts, where applicable,
shall be fastened together in a manner which will preclude loosening of bolts, screws, and rivets,
and cracking of welded joints when the vehicle is properly maintained and operated under the
intended service conditions. Wood shall not be used for structural framing. Outside body panels
and other sheet metal shall be of aluminum alloy or steel and of proper gages, not less than the
gages, as applicable, regularly furnished by the body manufacturer in the bus of the model
offered. The body, roof, and panel joints shall be watertight and leakproof. Unless zinc coated
steel panels are used, joints shall be sealed with "Alumelastic" compound or equivalent. All
steel 12-gage (0.1046 inch) and lighter shall be zinc coated in accordance with
ASTM Designation: A525, and table I, Coating Glass G 60, or aluminum zinc coating.
3.5.3 Floor. Floor frame and floor plates, with entrance step and wheel housing shall be
of substantial construction; properly integrated with the body structure, and shall conform to
Federal Motor Carrier Safety Regulation 393.84. Flooring shall be treated as specified in 3.1.1.7.
Plywood used in floor panels shall be water resistant, exterior grade, fir or dense southern pine.
Floor panels shall be of not less than (a) 3/4-inch, seven-ply plywood; or (b) 1/2-inch, five-ply
plywood over 10-gage steel; or (c) 5/8-inch, five-ply plywood over 14-gage steel. Steel
crossmembers not less than 2 inches in depth and spaced to provide support for the loads
imposed shall be furnished under the floor.
3.5.3.1 Stepwell. Stepwell shall be enclosed two-step type constructed of steel, covered
with 3/16-inch thick rubber or synthetic rubber blend ribbed material. Height of bottom step
shall not exceed 16 inches.
3.5.3.2 Wheelhousings. Wheelhousings shall include splash shields, front and rear,
under the body. Ample clearance for the use of tire chains on at least the outside driving tires
shall be provided.
3.5.3.3 Floor covering. The under seat floor area and the wheelhousings shall be
covered with not less than 1/8-inch thick rubber or synthetic rubber blend material. The aisle
and entrance area shall be covered with not less than 3/16-inch thick rubber or synthetic rubber
blend, ribbed material. Coverings shall be properly installed and adequately sealed at the joints.
Aisle joints shall be covered with strips, securely fastened with screws. The floor in the driver's
area shall be covered with a mat or with the same materials as used in the underseat or aisle area.
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