Ground joint brass connections which allow adjustment of tubing but provide a rigid joint when made up shall not be considered slip joints.
Expansion joints of an approved type shall be permitted where necessary.
The joints between drainage pipes and water closets, trap standard service sinks, pedestal urinals, or other floor outlet connected fixtures with trap standards shall be made to the drainage piping by means of brass or iron flanges, caulked, soldered, threaded or by use of a gasket in accordance with Section P-305. The connection shall be bolted to the earthenware by means of a brass bolt between the base of the fixture and the connection. The floor flange shall be set on an approved, firm base. When supported on wood floor construction, flanges shall be securely fastened to the floor construction. Floor flanges shall not be less than 1/4-inch thick when of cast iron or galvanized malleable iron, and not less than 1/8-inch thick when of brass or hard lead used for repair only. The joints between roof drains and floor drains shall be connected to the drain lines in accordance with this Chapter or by using a gasket in accordance with Section P-305.