N.Y. Multiple Dwelling Law § 241: Partitions; fire-stopping

§ 241. Partitions; fire-stopping. 1. In tenements erected after April

eighteenth, nineteen hundred twelve, wood stud apartment partitions

which are directly over each other shall run through the wood floor

beams and rest upon the plate of the partition below. In fireproof

tenements erected after such date all partitions shall rest directly

upon the fireproof floor construction and extend to the fireproof beam

filling above. Apartment partitions within the meaning of this section

are partitions crossing the floor beams at any angle and separating one

apartment from another or any part of an apartment from any public part

of the dwelling.

2. In tenements erected after April eighteenth, nineteen hundred

twelve, apartment studding shall be filled in solidly between the

uprights to the depth of the floor beams with incombustible materials.

3. In non-fireproof tenements erected after April twelfth, nineteen

hundred one, in every wall where wood furring is used, every course of

masonry from the under side to the top of any floor beams shall project

a distance of two inches or more beyond each face of the wall that is

not on the outside of the dwelling, so as to provide an effective fire

stop; and whenever floor beams run parallel to a wall and wood furring

is used, every such beam shall always be kept two inches away from the

wall, and the space between the beams and the wall shall be built up

solidly with brickwork from the underside to the top of the floor beams

so as to form an effective fire stop.