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NYC Building Code

§ 2603.4.1.6 — § 2603.4.1.6

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What is NYC BC § 2603.4.1.6?

Quick Answer

This section outlines the requirements for foam plastic insulation in attics and crawl spaces where entry is limited to utility service. It specifies acceptable protective materials to prevent ignition of the insulation. Applies to building owners managing insulation in these specific areas.

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

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2603.4.1.6 Attics and crawl spaces.

BC § 2603.4.1.6

Within an attic or crawl space where entry is made only for service of utilities, foam plastic insulation shall be permitted without thermal barrier if protected against ignition by 1 1/2-inch-thick (38 mm) mineral fiber insulation; 1/4-inch-thick (6.4 mm) wood structural panel, particleboard or hardboard; 3/8-inch (9.5 mm) gypsum wallboard, corrosion-resistant steel having a base metal thickness of 0.016 inch (0.4 mm); 1 1/2-inch thick (38 mm) self-supported spray-applied cellulose insulation in attic spaces only or other approved material installed in such a manner that the foam plastic insulation is not exposed. The protective covering shall be consistent with the requirements for the type of construction.

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