Par. 1. - Dead loads shall consist of the weight of walls, floors, roofs, and permanent partitions. The weights of various materials shall be assumed as follows:

Live Loads

Par. 2. - Live loads shall include all loads except dead loads. Every permit shall state the purpose for which the building is to be used, and all floors and stairs shall be of sufficient strength to bear safely the weight to be imposed thereon in addition to the dead load, but shall safely support a minimum uniformly distributed live load per square foot as specified in the following table:

Pah. 3. - The commissioner may require design for heavier loads than the above minimum values if, in his judgment, the purpose of the building or vibrating machinery requires it. For buildings or structures not included in the above table, the commissioner shall establish allowable live loads.

Allowable - Maximum Loads Imposed

Par. 4. - The commissioner may prescribe the maximum loads which may be imposed upon the floors of existing buildings.

Change of Occupation - Permit Required

Par. 5. - No use or occupation of a building or part of building for a purpose other than that for which it is designed to be used, as set forth in the permit upon which it was erected, and no change in the use or occupation of a building or part thereof which will increase the floor load beyond the capacity prescribed for such use and occupation shall be made unless, upon application therefor, the commissioner shall issue a permit on condition that the proposed use will not endanger the safety of the building or the health or the safety of the occupants thereof.

Floor Loads to be Posted

Par. 6. - Before any building hereafter erected is occupied, in whole or in part, as a business building, and before any building already erected but not previously occupied as a business building, is occupied or used, in whole or in part, for that purpose, and whenever, for any reason, the commissioner shall prescribe the load for an existing building or part thereof, the safe live load for each floor, or portion of each floor as approved by the commissioner, shall be marked on metal plates, of character approved by him, which shall be supplied and securely affixed by the owner of the building in a conspicuous place in the story to which they relate. It shall be the duty of the occupants of the building to maintain such plates during their occupancy, and the owner of the building or his agent shall cause the same to be properly affixed with each change of occupancy. No person shall place or cause or permit to be placed on any floor of any building any greater load than the approved safe load.

Slab, Arch and Beam to Have Sufficient Strength to Bear Live and Dead Load

•Par. 7. - Every plank, slab and arch, and every floor beam carrying one hundred square feet of floor or less, shall be of sufficient strength to bear safely the combined dead and live load supported by it, but the floor live loads may be reduced for other parts of the structure as follows:

Live Load Reductions

Par. 8. - In all buildings except armories, garages, gymnasiums, storage buildings, wholesale stores, and assembly halls, for all flat slabs of over one hundred square feet area, reinforced in two or more directions and for all floor beams, girders, or trusses carrying over one hundred square feet of floor, ten per cent reduction.

Par. 9. - For the same, but carrying over two hundred square feet of floor, fifteen per cent reduction.

Par. 10. - For the same, but carrying over three hundred square feet of floor, twenty-five per cent reduction.

Par. 11. - These reductions shall not be made if the member carries more than one floor and therefore has its live load reduced according to the table below.

Par. 12. - In public garages, for all flat slabs of over three hundred square feet area reinforced in more than one direction, and for all floor beams, girders and trusses carrying over three hundred square feet of floor, and for all columns, walls, piers, and foundations, twenty-five per cent reduction.

Par. 13. - In all buildings except storage buildings, wholesale stores, and public garages, for all columns, girders, trusses, walls, piers, and foundations.

Carrying one floor, . .    No reduction.

Carrying two floors, . .    Twenty-five per cent reduction.

Carrying three floors, .    Forty per cent reduction.

Carrying four floors, . .    Fifty per cent reduction.

Carrying five floors, . .    Fifty-five per cent reduction.

Carrying six floors or more,    Sixty per cent reduction.

Roof Loads

Par. 14. - Roofs shall be designed to support safely minimum live loads as follows: -

Par. 15. - Roofs with pitch of four inches or less per foot, a vertical load of forty pounds per square foot of horizontal projection applied either to half or to the whole of the roof.

Par. 16. - Roofs with pitch of more than four inches and not more than eight inches per foot, a vertical load of fifteen pounds per square foot of horizontal projection and a wind load of ten pounds per square foot of surface acting at right angles to one slope, these two loads being assumed to act either together or separately.

Par. 17. - Roofs with pitch of more than eight inches and not more than twelve inches per foot, a vertical load of ten pounds per square foot of horizontal projection and a wind load of fifteen pounds per square foot of surface acting at right angles to one slope, these two loads being assumed to act either together or separately.

Par. 18. - Roofs with pitch of more than twelve inches per foot, a vertical load of five pounds per square foot of horizontal projection and a wind load of twenty pounds per square foot of surface acting at right angles to one slope, these two loads being assumed to act either together or separately.