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NYC Building Code

§ 2603.4 — § 2603.4

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What is NYC BC § 2603.4?

Quick Answer

This section establishes requirements for thermal barriers that separate foam plastic from the interior of buildings. It specifies the use of approved materials that limit temperature rise during fire exposure, ensuring safety compliance with various standards. Applies to building owners 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 Thermal barrier.

BC § 2603.4

Except as provided for in Sections 2603.4.1 and 2603.9, foam plastic shall be separated from the interior of a building by an approved thermal barrier of 1/2-inch (12.7 mm) gypsum wallboard or equivalent thermal barrier material that will limit the average temperature rise of the unexposed surface to not more than 250°F (120°C) after 15 minutes of fire exposure, complying with the standard time-temperature curve of ASTM E 119 or UL 263. The thermal barrier shall be installed in such a manner that it will remain in place for 15 minutes based on FM 4880, UL 1040, NFPA 286 or UL 1715. Combustible concealed spaces shall comply with Section 719 of this code. Exception: Thermal barriers for exterior walls shall comply with Section 2603.5.2.

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