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NYC Building Code

§ 722.2.1.2.2 — § 722.2.1.2.2

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What is NYC BC § 722.2.1.2.2?

Quick Answer

This section outlines the fire-resistance ratings applicable to precast concrete wall panels that incorporate foam plastic insulation. It specifies that insulation less than 1 inch in thickness is not considered in these ratings, and provides a formula for calculating fire-resistance based on the insulation's thickness. Applies to building owners using precast concrete wall panels in construction.

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

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722.2.1.2.2 Foam plastic insulation.

BC § 722.2.1.2.2

The fire-resistance ratings of precast concrete wall panels consisting of a layer of foam plastic insulation sandwiched between two wythes of concrete shall be permitted to be determined by use of Equation 7-4. Foam plastic insulation with a total thickness of less than 1 inch (25.4 mm) shall be disregarded. The Rn value for thickness of foam plastic insulation of 1 inch (25.4 mm) or greater, for use in the calculation, is 5 minutes; therefore Rn0.59 = 2.5.

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