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NYC Building Code

§ 2603.4.1.4 — § 2603.4.1.4

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What is NYC BC § 2603.4.1.4?

Quick Answer

This section permits the use of foam plastic with specific flame and smoke-developed indices in exterior walls of one-story buildings, provided it is covered by a specified thickness of aluminum or corrosion-resistant steel and the building is equipped with an automatic sprinkler system. Applies to owners of one-story buildings utilizing foam plastic in construction.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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2603.4.1.4 Exterior walls – one-story buildings.

BC § 2603.4.1.4

For one-story buildings, foam plastic having a flame spread index of 25 or less, and a smoke-developed index of not more than 450, shall be permitted without thermal barriers in or on exterior walls in a thickness not more than 4 inches (102 mm) where the foam plastic is covered by a thickness of not less than 0.032-inch-thick (0.81 mm) aluminum or corrosion-resistant steel having a base metal thickness of 0.0160 inch (0.41 mm) and the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.

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