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NYC Building Code

§ 2603.5.4 — § 2603.5.4

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What is NYC BC § 2603.5.4?

Quick Answer

This section establishes requirements for flame spread and smoke-developed indexes for foam plastic insulation and exterior coatings. Materials must be tested for compliance with ASTM E 84 or UL 723 standards, ensuring a flame spread index of 25 or less and a smoke-developed index of 450 or less. Applies to building owners using specific insulation materials.

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

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2603.5.4 Flame spread and smoke-developed indexes.

BC § 2603.5.4

Foam plastic insulation, exterior coatings and facings shall be tested separately in the thickness intended for use, but not to exceed 4 inches (102 mm), and shall each have a flame spread index of 25 or less and a smoke-developed index of 450 or less as determined in accordance with ASTM E 84 or UL 723. Exception: Prefabricated or factory-manufactured panels having minimum 0.020-inch (0.51 mm) aluminum facings and a total thickness of 1/4-inch (6.4 mm) or less are permitted to be tested as an assembly where the foam plastic core is not exposed in the course of construction.

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