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The infiltration of air into insulated walls reduces the effectiveness of the insulation and increases the rate of heat loss. The obvious solution to this problem is to build “air-tight” walls. An air infiltration barrier can be installed during construction to effectively provide an “air-tight” envelope. A unique nonwoven fabric that has excellent breathability can be used for this application without causing excess moisture build-up or condensation in the wall cavity. Laboratory results showing energy savings that may be achieved by installing air infiltration barriers are presented for both mobile home and site-built home wall constructions. Energy savings for an air infiltration barrier installed on attic floors are shown, including the results of a 50-home field test.
air infiltration barrier, air leakage, thermal performance, energy conservation, building heat loss, nonwoven fabric
Senior Research Chemist, E. I. Du Pont de Nemours and Company, Textile Fibers Department, Spunbonded Products Division, Wilmington, Del.