Residential moisture conditions - facts and experience.

Studies moisture conditions in homes in 2 studies. In one study, 17 homes in 4 states were probed in mid-March 1977, and all moisture content levels were found to be within the acceptable range of equilibrium moisture contents. Inanother study, collects data for 16 homes in north-central Utah, Southern Alabama, Northern Ohio and central Maryland. Makes measurements in each home for approx 1 week in the summer and 1 week in the winter. All homes have well-ventilated attics. Calculations show the average absolute humidities in winter in attics for homes with a ceiling vapour barrier are 19% higher than for attics without a ceiling vapour barrier. More extensive measurements probably would show no consequential difference in relative humidity in well ventilated attics with homes having a ceiling vapour barrier or those without.