There is a commercial structure that has been sprayed with an application of polyurethane foam insulation above drop ceilings within a Type II-B constructed building.
Cut sheets for material with liquid-applied intumescent coating would indicate it may comply with the definition of limited combustible material by NFPA 13.
Based on cut sheets for applications the reference is to a Type V construction and the project that it is being utilized in is a Type II-B construction therefore we have required fire sprinkler protection above ceilings.
My question is: would the application of this polyurethane foam insulation constitute a combustible concealed space, required to follow NFPA 13, Section 220.127.116.11?
Section 2603 of the IBC address installation of foam.
3.3.16* Limited-Combustible (Material). Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8100 kJ/kg), where tested in accordance with NFPA 259, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; or (2) materials, in the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than
25 nor evidence of continued progressive combustion, when tested in accordance with ASTM E84, Standard Test Method of Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard Test Method of Surface Burning Characteristics of Building Materials
18.104.22.168 Concealed Spaces Requiring Sprinkler Protection. Concealed spaces of exposed combustible construction shall be protected by sprinklers except in concealed spaces where sprinklers are not required to be installed by 22.214.171.124.1 through 126.96.36.199.18 and 8.15.6.
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