Controlling Home Moisture for Indoor Air Quality Kenneth Hellevang, Ph. D. Professional Engineer, Professor North Dakota State University.

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Presentation transcript:

Controlling Home Moisture for Indoor Air Quality Kenneth Hellevang, Ph. D. Professional Engineer, Professor North Dakota State University

Moisture Production in a Home Shower (excludes towels & spillage) 1.0 / 10 minute shower Clothes drying (vented indoors) 5.0 / load Combustion (unvented space heater) 7.6 / gallon of kerosene Cooking dinner (family of four) 1.2 (1.6 if gas cooking) Floor mopping 1.5 / 50 sq. ft. Respiration (family of four) 0.4 / hour Desorption of materials: seasonal 6 to 17 / day New construction 10+/day Ground moisture migration Up to 100 /day 1.0 pint will increase the relative humidity by about 8% in a 1,500 sq. ft. single floor home

Water Control 1 inch of rain on 1,000 sq. ft. = 623 gallons Extend down spouts Slope ground 1 inch per foot away from the house

UNHEATED crawls space HEATED crawl space