A. Where floor beams, ceiling beams, or roof beams enter a party or fire wall from opposite sides, the ends of such beams shall be separated at least six inches (6") by solid masonry or concrete. Such preparation may be obtained by corbelling the wall or staggering the beams, but no wall shall be corbeled more than two inches (2") for this purpose. The ends of all wooden beams entering the masonry walls shall be cut to a level to make them self-releasing.
B. Openings in party or fire walls shall be provided with self-closing fire doors or with positive means of closing the openings to prevent the passage of fire. Doors in fireproof stair and elevator shaft enclosures and coverings for hatchways in floors of all buildings shall be self-closing. (1964 Code § 297)