. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Managing Moisture in Wood-Frame Buildings Over the past 10 years, rising energy costs have changed building construc- tion practices. Buildings are better insulated and air leakage has been greatly reduced. These factors can combine to create moisture problems within walls, floors, and roofs of our wood-frame homes. To prevent damage to these structures, indoor humidity levels must be controlled. The moisture that results primarily from breathing, cooking, and bathing can be mana
. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Managing Moisture in Wood-Frame Buildings Over the past 10 years, rising energy costs have changed building construc- tion practices. Buildings are better insulated and air leakage has been greatly reduced. These factors can combine to create moisture problems within walls, floors, and roofs of our wood-frame homes. To prevent damage to these structures, indoor humidity levels must be controlled. The moisture that results primarily from breathing, cooking, and bathing can be managed by ventilating the living space and using proper construction techniques. Researchers at the Forest Products Laboratory are taking several ap- proaches to ensure that moisture in our homes does not become a construction problem on a national scale. These include analytic studies and laboratory experiments along with field experi- ments under both controlled and natural conditions. A theoretical model, which includes the effect of air leakage, has been developed to analyze moisture movement through walls. A field study of moisture in attics indicates that present ventilation criteria, which were developed in the 19^0's, may not be suitable for today's construction. Con- trolled field experiments describe the seasonal moisture changes in walls of several different types of houses in both a cold climate and a moist summer climate. Manufacturers are using results of these studies of siding and insulation materials in their recommendations of construction techniques to help the homeowner avoid moisture problems. Moisture Balance Example House. * Walls and ceiling have kraft vapor retarder without major flaws * Air changes per hour. Breathing, cooking, and bathing give off a surprising amount of moisture. New venting techniques may be needed to avoid problems. 50. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readab
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