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72 or supports are used in the construction of chimneys or fire- places, they shall be removed within two weeks after masonry is laid. Para. 9. Sizing and spacing of girders shall be in accord- ance with Tables, I, II, III, and IV appended. Para. 10. Wood floor joists. 1. Where joists frame into side of wood girders, metal hangers or a bearing strip spiked to the girder must be used. 2. Floor joists framed into mas- onry walls shall have at least a four inch bearing and a three inch fire bevel cut. 3. Floor joists shall be doubled under all partitions running parallel to the floor joists. 4. All headers over four feet long shall be doubled. 5. Floor joists shall be cross bridged when span exceeds eight feet. At least one by three inch or stronger stock shall be used. Para. 11. Wood Rafters. 1. Truss construction may be used provided it is of a strength comparable with Table IV and is approved by the Building Inspector. 2. Collar ties not less than 2 x 4 or 1 x 6 inches shall be used for all sloping rafters. Para. 12. Exterior wall studs. 1. Studs shall not be less than two inches by four inches placed not more than sixteen inches on center. 2. Headers over all openings shall be doubled and shall be at least the following: (a) up to 3'-2 2 x 4's (b) 3' to 51/2'-2 2 x 6's on edge. (c) 51/2' to T-2 2 x 8's on edge. (d) over T-2 2x10's on edge. 3. In lieu of headers, approved- trusses may be used. 4. Studs in exterior frame walls may run from sill to roof line provided they do not exceed twenty feet in length. 5. Studs shall not be spliced. 6. Floor joists on exterior walls shall bear on at least a one inch by six inch ribbon let into the face of the studding. Joists bearing on such ribbons shall be securely nailed to the studs. Para. 13. Plates: All top plates shall be not less than two inches by four inches doubled, which shall lap at all corners and joints or butts. Para. 14. Interior Partitions. 1. All bearing partitions shall be not less than two inches by four inches set the four inch way, and not more than sixteen inches on center. 2. All openings in bearing partitions shall have double headers framed as required in exterior openings. 3. Top plates for bearing partitions shall be doubled. Para. 15. Notching of Timbers: Notching of joists to facilitate the installation of pipes and ducts may be permitted with the following installations: 1. Top and bottom edges may be notchednot • to exceed one sixth of the joist depth: