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Unvented attic spray foam insulation application with Icynene open cell foam

The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation, improvements in HVAC equipment, more airtight construction, new materials and assemblies. Senior Engineer Manager at Icynene, John Broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. This piece originally appeared in Construction Specifier magazine.