N.Y. Multiple Residence Law § 204

§ 204. Bulkheads. Every stair and fire-stair required by this chapter\nto extend to the level of the roof shall extend to and through a\nfireproof bulkhead or other fireproof enclosure in such roof. Such\nbulkhead or enclosure shall give unobstructed access at all times to\nsuch roof by means of a fireproof door and door assembly with the door\nself-closing. Stairs to a bulkhead or enclosure shall have a handrail.\nWhere the roof of a dwelling is pitched or sloped more than fifteen\ndegrees, no bulkhead or stairs leading thereto shall be required.\n