Rigid polyurethane and polyisocyanurate foams are effective insulation materials that can be used by architects, builders, and contractors to meet today’s stringent energy code requirements. Depending on product-specific composition factors, the fire performance characteristics of polyurethane and polyisocyanurate foams may vary, as is the case with many other organic materials.
To promote jobsite safety, all organic foam insulation, regardless of whether they contain flame retardants, should be considered combustible and handled accordingly. The precautions detailed in this guidance document can help minimize potential ignition and fire during handling, storage, and use. Ultimately, the building code fire safety requirements that apply to the use of polyurethane and polyisocyanurate foams in a building will be determined by the specific application (e.g., roofing insulation, interior wall cavity insulation).