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NYC Building Code

§ 2603.4.1.10 — § 2603.4.1.10

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What is NYC BC § 2603.4.1.10?

Quick Answer

This section permits the use of foam plastic insulation as a siding backer board under specific conditions, including a maximum thickness and separation requirements. The statute outlines the thermal performance criteria as determined by NFPA 259. Applies to building owners utilizing foam plastic insulation in siding applications.

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

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2603.4.1.10 Siding backer board.

BC § 2603.4.1.10

Foam plastic insulation of not more than 2,000 British thermal units per square foot (Btu/sq. ft.) (22.7 MJ/m 2 ) as determined by NFPA 259 shall be permitted as a siding backer board with a maximum thickness of 1/2-inch (12.7 mm) without a thermal barrier, provided it is separated from the interior of the building by not less than 2 inches (51 mm) of mineral fiber insulation or equivalent or where applied as insulation over existing wall construction.

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