Columbia University Libraries Digital Collections: The Real Estate Record

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March 14,1881 Record and Guide. 387 aod requiring the arcUt«ct or contractor to submit diagrams showing the loads to be carried, the strains produced, and the dimensions of the materials to provide for such strains. All iron-work and sieel-work must be properly painted wilh oxide of u'ou and linseed-oil paint tefore being placea in position, or coated with some other equally good preparation, or suitably treated for preservation agaiost rust. No wooden floor beam nor wooden roof beam used in aoy building, othei- tban a frame building, shall be less than S inches iu thickness. Trimmer and heade- beams must be not less than 1 inch tbic'ter thao tbe floor or roof beams ot the same tier, when the header is 4 feet or less in lengtb; where the hetder is more iban 4 feet and not more than 15 feet in length the trimmer atd header beams must be at least double the thickness of the floor or I'oof beams, or made oE two beams spiked together; and when the header is more than 15 feet in length wrought-iron flitch plates between wooden beans must be used in constructing the trimmer aod header beams, or wrought-iron or steel beams may be used. North of Canai strtet, west of the Bowery, and north of New Chambers street, east of the Bovery, business and manufacturing buildings may be erected to a height of 100 feet (with thesame hmit as to width and depth of non-fire-proof buildiigs) constructed on the slow burning principle, that is to say, in which tht floor and roof heams are of wood, properly protected from flre by deafenng ou top and covered witb iron or metal lathing securely fastened to ;he sides and undersides of said beams aud plastered, provided, however, tiat when a building so constructed exceeds Ho feet in height (but in no caseto exceed 100 feet in hoigbt] the halls and stairs shall be inclosed in brick vails, and the stairs, which may be of wood, shall be covered on the undg-side with iron or metal lath and plastered, and the partitions must be of incombustible material. Theheight for nonflre-nroof buildings, which is uow limited to 80 feet, is increased 5 feet~t