Abstract
ABSTRACT EXISTING houses are currently being retrofitted for energy conservation by insulating, reducing air leakage, and often adding mechanical humidification. Unfortunately, all of these measures increase the poten-tial for cold weather condensation. Recent studies by the Forest Products Laboratory in a test structure simulating an older home show the effect of indoor relative humidi-ty, vapor-resistant paints on plaster surfaces,and ventila-tion of walls on condensation potential in retrofitted walls. The tests were conducted under actual exposure to the climatic conditions of Madison, WI. The information presented guides homeowners and others concerned with retrofitting housing for energy conservation. Inadequate moisture control can result in reduced efficiency of insulation, excessive siding maintenance and wood decay.
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