(a) The minimum thickness of any wooden floor joists or roof rafters shall be standard two inches, provided such joists or roof rafters are not more than standard twelve inches in depth. All joists shall be crossbridged for each eight feet of span. Such floor joists shall be spaced not more than sixteen inches on centers. The minimum size of studs for bearing partitions in joist construction shall be standard two inches by four inches spaced not more than sixteen inches on centers, doubled around all openings and tripled at corners. Trimmer and header joists, except where supported by partitions, are to be doubled when the number of tail joists is more than two. Joists under partitions running the same way shall be doubled. Stair horses shall be spaced not less than eighteen inches between centers. For single, semi-detached or multiple-family dwellings, the following table in inches shall be the minimum size floor joist allowable.
12 ft. or Under | 14 ft. or Under |
12 ft. or Under | 14 ft. or Under | |
1st | 3x8 or 2x10 | 3x10 |
2nd | 3x8 | 2x10 |
3rd | 2x8 | 2x8 |
Porch | 2x8 | 2x8 |
16 ft. or Under or under | 20. ft. or Under or under | |
3x10 or 3x8 | 3x10 or 3x8 | |
2x10 or 3x8 | 2x10 or 3x8 | |
2x10 or 3x8 | 2x10 or 3x8 | |
2x8 | 2x8 | |
2x8 | ||
(b) All buildings over twenty feet in width shall have the floor joist carried upon a wood, iron or steel girder placed on stone or brick piers or cast iron or steel posts. If a pier of stone is used it shall not be less than twenty-four inches square, and if of brick, it shall be not less than thirteen inches square. If posts of iron or steel are used, they shall be of standard structural shapes and shall be not less than four inches in diameter on the smallest axis. All shall be placed upon footings to be approved by the Building Inspector, and all iron and steel posts shall have standard plates at the top and bottom.
(c) Spans of wooden girders shall be limited to twelve feet between centers of bearings.
(d) The ends of joists or rafters shall not penetrate a fire-wall or party wall a greater distance than three inches, and in no case shall such penetration be of such distance as will place any joists or rafters on opposite sides of the same wall within two inches of each other. Such allowable space shall be well bonded and sealed with masonry or other fire-resisting materials.
(e) In all buildings of the third-class, subsills shall be not less than four inches by six inches, and if a raising sill is used, it shall be not less than two-two inches by four inches.
(Ord. 288. Passed 5-24-54.)