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234 6-57 No floor hereafter erected in a residence building shall be designed for less than forty pounds per square foot of area live load uniformly distri- buted. Public rooms and corridors in a residence building shall be designed for not less than 80 pounds per square foot live load. 6-57A Every building and structure shall b'designed and erected of sufficient strength in all its parts to sustain safely. all live loads depending thereon, whether permanent or temporary, in addition to the dead load. 6-57B All floor and ceiling joists shall have a bearing of not less than four (4) inches at each end of the wall or beam supporJing same and no wood floor joist shall be less than two (2) inches by eight (8 inches nor shall they be spaced more than sixteen inches on centers. 6-58 All floor joists shall be provided with well nailed cross bridgtng and the distance between each row of cross bridging shall not exceed eight (8) feet. 6-59 A sub-floor having a minimum t~lickness of five-eighths (5/8) inches shall be required. All such sub-floor shall be laid diagonally. Plywood flooring shall be 5/8" thick. Wood flooring shaH be 3/4" thick. 6-60 All wood joists shall bear on a 1" x 4" ribbon rabbe~d into studs unless such joists bear upon 2" x 4" plates. 6-61 The size of all studding used for any partition or wall shall not be less than two (2) inch by four (4) inches placed in such a manner that the four (40 inch dimension 'orms the thichness of the walls except when placed adjacent to a chimney; an unused wall, that is, an interior wall not separating two (2) li ve- able rooms, or a used wall less than three and one-half (3~) feet in length in which case, the stndding may be placed so that the two (2) inch thiclmess foms the thickness of the wall. Studding in all buildings shall be spaced not more than sixteen (16) inches on center. 6-62 . All stud partitions shall have two inch by four inch plates at top and bottom to serve as a fire stop, except that bearing partitions shall have 60uble plates at the top. 6-63 When stud wall is used as a bearing wall to support the first floor Joist they shall be two (2) inches by six (6) inches material spaced not IllIJre tijan six- teen (16) inches on center. The bottom plate shall be single and it shall be :baised above easement floor at least four (4) inches. The top plate shall be double. Each stud wall shall be constructed on a concrete' curb and this curb shall. extend from one end of the wall to the other without opening. 6-64 At least one doorway serving as an exit shall have a width of thirty-two (32) inches, or more.. 6-65 No stairway serving as an exit shall have a width less than thirty-six (36) inches. . 6-66 At least two ~2) exits shall be provided for each floor of any building which is to be used as a multipledwelling. These exits shall be placed as far apart as possible. 6-67 The publication entitled "Standard Specifications for Gypsum Plastering In- cluding Requirements for Lathing and Furring" (A.S .A. designation 1\.43'. 1-1950 -)1--