N.Y. Multiple Dwelling Law § 152: Fire-stopping

§ 152. Fire-stopping. 1. In every wall where wooden furring is used

every course of masonry from the under side to the top of any floor

beams shall project a distance of at least two inches beyond each face

of the wall that is not on the outside of the dwelling; and whenever

floor beams run parallel to a wall and wooden furring is used, every

such beam shall always be kept at least two inches away from the wall,

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

with brickwork from the under side to the top of the floor beams.

2. Whenever a wall is studded off, the space between an inside face of

the wall and the studding at any floor level shall be fire-stopped.

Every space between beams directly over a studded-off space shall be

fire-stopped by covering the bottom of the beams with metal lath and

plaster and placing a loose fill of incombustible material at least four

inches thick on the plaster between the beams, or hollow-burned clay

tile or gypsum plaster partition blocks, at least four inches thick in

either case and supported by cleats, shall be used to fill the spaces

between beams.

3. Partitions which are not parallel with the wood floor beams and

which separate one apartment or suite from another or any part of an

apartment or suite from a public hall or other part of the dwelling

outside the apartment or suite shall be filled in solidly with

incombustible material between the floor beams from the plate of the

partition below to the full depth of the floor beams.

4. If a dwelling is within ten feet of another non-fireproof building

or of a side lot line, such dwelling shall have its eaves or cornices

built up solidly with masonry.

5. The wooden frames in any cornice on any row of buildings shall be

separated between buildings by a complete fire-stop.

6. Every space between stair carriages of any non-fireproof stair

shall be fire-stopped by a header beam at top and bottom. Where a stair

run is not all in one room or open space, the stair carriages shall have

an intermediate firestop, so located as to cut off communication between

portions of the stair in different rooms or open spaces. The underside

and stringers of every unenclosed stair of combustible material shall be

fire-retarded.

7. All partitions required to be fire-retarded shall be fire-stopped

with incombustible material at floors, ceilings and roofs.

Fire-stopping over partitions shall extend from the ceiling to the

underside of any roofing above. Any space between the top of a partition

and the underside of roof boarding shall be completely fire-stopped.