AC456 Fire-protective Coatings Applied to Spray-applied Foam Plastic Insulation Installed without a Code-prescribed Thermal Barrier - Approved October 2015, editorially revised January 2021 (PDF Download)
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AC456 established guidelines for the testing and evaluation of a fire-protective coating when used in conjunction with a spray-applied foam plastic insulation, to be recognized for use without installation of a code-prescribed 15-minute thermal barrier, since the codes do not provide prescriptive requirements for testing and determination of equivalency for this type of product.