In recent years, there has been some debate over which insulation products are better at reducing air infiltration. The fact is reducing air infiltration in a home is largely dependent on the air sealing package, not the insulation installed in the wall cavity. A new report published this fall from Building Science Corporation (BSC) affirms that insulation, of any type, is no substitute for proper air sealing and prevention of air infiltration. BSC’s multi-year insulation research project entailed a baseline set of seven test walls, including fiber glass batts, cellulose, spray foam and extruded polystyrene.
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