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