Hygrothermal Analysis of Wood-Frame Wall Assemblies in a Mixed-Humid Climate
نویسنده
چکیده
M o is tu re tr a n s fe r H e a t tr a n s fe r April 2013 Glass, Samuel V. 2013. Hygrothermal analysis of wood-frame wall assemblies in a mixed-humid climate. The use of trade or firm names in this publication is for reader information and does not imply endorsement by the United States Department of Agriculture (USDA) of any product or service. The USDA prohibits discrimination in all its programs and activities on the because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Abstract This study uses a one-dimensional hygrothermal model to investigate the moisture performance of 10 residential wood-frame wall assemblies in a representative mixed-humid climate location of Baltimore, Maryland (climate zone 4A). All the assemblies include oriented strandboard (OSB) sheathing and vinyl siding. The walls differ in stud cavity thickness, level of cavity insulation, presence and type of exterior insulation, and class of interior vapor re-tarder. The performance of the wall assemblies is compared in four respects. First, seasonal trends in moisture, humidity, and temperature conditions are investigated, and the potential for wintertime moisture accumulation in OSB sheathing from vapor diffusion is assessed. Second, the rate at which OSB sheathing is able to dry from a high initial moisture content is compared for each wall assembly at four different times of year. Both the vapor diffusion and drying performance studies include sensitivity analyses to gauge the extent to which simulation results depend on various input parameters. Third, the response of OSB moisture content to wind-driven rain intrusion is examined. Finally, the contribution of air exfiltration to wintertime moisture accumulation in OSB sheathing is evaluated.
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