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ESR-3159 i Most lNidely Accepted and Trusted Page 3 of 5 4.4 Attics and Crawl Spaces: 0.27 gallon (1 L) per 100 square feet(9.3 m2)to obtain the 4.4.1 Application with a Prescriptive Ignition Barrier: recommended minimum dry film thickness noted in this When the spray-applied insulation is installed within attics section. or crawl spaces where entry is made only for service of 4.4.2.3 Application without an ignition barrier or utilities, an ignition barrier must be installed in accordance intumescent coating: In attics, JM Corbond MCST"' foam with IBC Section 2603.4.1.6 or IRC Section R316.5.3 or insulation may be spray-applied to the underside of the R316.5.4, as applicable. The ignition barrier must be roof sheathing and/or rafters; in crawl spaces, the consistent with the requirements for the type of insulation may be spray-applied to the underside of wood construction required by the applicable code, and must be floors as described in this section. The thickness of the installed in a manner so the foam plastic insulation is not foam plastic applied to the underside of the top of the exposed. The insulation as described in this section may space must not exceed 8 inches (203 mm), and the be installed in unvented attics in accordance with 2012 IRC thickness when applied to vertical surfaces must not Section R806.5 or 2009 IRC Section R806.4 when exceed 6 inches (152 mm). The foam plastic may be installed at a minimum thickness of 1'/2 inches(38 mm). installed uncovered, without either a code-prescribed 4.4.2 Application without a Prescriptive Ignition ignition barrier or an intumescent coating. Barrier: When JM Corbond MCST"" spray-applied 4.4.2.4 Use on Attic Floors: JM Corbond MCST"" spray- polyurethane foam insulation is installed without an ignition applied foam insulation may be installed at a maximum barrier in attics and crawl spaces, as described in Sections thickness of 11'/4 inches (286 mm) between and over the 4.4.2.1 and 4.4.2.4, the following conditions apply: joists in attic floors. The ignition barrier, in accordance with a. Entry to the attic or crawl space is only to service �BC Section 2603.4.1.6 or IRC Section R316.5.3, may be utilities, and no storage is permitted. omitted. A thermal barrier is required between the foam plastic and the habitable space below. b. There are no interconnected attic or crawl space 4.5 Exterior Walls of Type I,II,III and IV Construction: areas. c. Air in the attic or crawl space is not circulated to other 4.5.1 General: When used on exterior walls of Type I, II, parts of the building. III and IV construction, the wall assembly must comply with Section 2603.5 of the IBC and this section (Section 4.5), d. Under-floor(crawl space)ventilation is provided when and the insulation must be installed at a maximum required by IBC Section 1203.3 or IRC Section thickness of 3 inches (76 mm). The potential heat of the R408.1, as applicable. JM Corbond MCST"^ insulation is 1992 Btu/ft2(22.7 MJ/m2) e. Attic ventilation is provided when required by IBC per inch of thickness when tested in accordance with Section 1203.2 or IRC Section R806, except when NFPA 259. air-impermeable insulation is permitted in unvented 4.5.2 Specific Wall Assemblies: Wall assemblies attics in accordance with Section R806.4 of the IRC. complying with Section 4.5 must be as described in f. Combustion air is provided in accordance with IMC Table 2. (International Mechanical Code�)Section 701. 5.0 CONDITIONS OF USE 4.4.2.1 Application with JM-IB Intumescent Coating: In The JM Corbond MCST"^ insulation described in this report attics, JM Corbond MCST"' foam insulation may be spray- complies with, or is a suitable alternative to what is applied to the underside of the roof sheathing and/or specified in, those codes listed in Section 1.0 of this report, rafters; in crawl spaces, the insulation may be spray- subject to the following conditions: applied to the underside of wood floors as described in 5.1 The products must be installed in accordance with the this section. The thickness of the foam plastic applied to manufacturer's published installation instructions, this the underside of the top of the space must not exceed evaluation report and the applicable code. If there are 10 inches (254 mm) and the vertical surfaces must not an conflicts between the manufacturer's exceed 8 inches(203 mm). The foam plastic surfaces must y published be covered with a minimum thickness of 5 dry mils installation instructions and this report, this report (0.13 mm) [10 wet mils) of the JM-IB intumescent coating 9overns. described in Section 3.6. The intumescent coating must be 5.2 The insulation must be separated from the interior of spray-applied over the insulation in accordance with the the building by an approved 15-minute thermal barrier Johns Manville instructions and this report at a rate of in accordance with IBC Section 2603.4 or IRC Section 0.6 gallon (2 L) per 100 square feet (9.3 mz) to obtain the R316.4, except when installation is as described in recommended minimum dry film thickness noted in this Sections 4.3.2 and 4.4.2. A thermal barrier must be section. installed between the insulation and the interior space 4.4.2.2 Application with TPRz Fireshell� JMIC above(crawl space)or below(attic). Intumescent Coating: In attics, JM Corbond MCST"" foam 5.3 The insulation must not exceed the thicknesses noted insulation may be spray-applied to the underside of the in Sections 3.2,4.3, 4.4 and 4.5. roof sheathing and/or rafters; in crawl spaces, the 5.4 The insulation must be protected from exposure to insulation may be spray-applied to the underside of wood vveather during and after application. floors as described in this section. The thickness of the foam plastic applied to the underside of the top of the 5.5 Jobsite certification and labeling of the insulation must space must not exceed 5.5 inches (140 mm), and the comply with IRC Sections N1101.4 and N1101.4.1and thickness when applied to vertical surfaces must not IECC Sections 303.1.1 and 303.1.2, as applicable. exceed 3.5 inches (89 mm). The foam plastic surfaces 5.6 When use is on exterior walls of buildings of Types I, must be covered with a minimum thickness of 3 dry mils �I, III and IV, construction must be as described in (0.08 mm) [4 wet mils] of the JM IC intumescent coating Section 4.5 and Table 2. described in Section 3.9. The intumescent coating must be spray-applied over the insulation in accordance with the 5.7 The insulation must be applied by installers certified Johns Manville instructions and this report at a rate of by Johns Manville Corporation or by the Spray