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Effect of cladding systems on moisture performance of wood-framed walls in a mixed-humid climateAuthor(s): S. Craig Drumheller; Charles G. Carll
Source: Thermal performance of the Exterior Envelopes of Whole Buildings XI International Conference, December 5-9, 2010, Clearwater Beach, Florida [electronic resource]. [Atlanta, GA : American Society of Heating, Refrigerating and Air-Conditioning Engineers], 2010: 12 p.: [1 CD-ROM]: ISBN: 9781933742892.
Publication Series: Miscellaneous Publication
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DescriptionA 22-month field investigation of nine different north-and south-oriented wood-framed wall assemblies was conducted to determine the moisture performance of various wall construction types, most of which incorporated absorptive cladding. The study was conducted on the campus of the National Association of Home Builders (NAHB) Research Center, in Upper Marlboro, MD, 20 miles east of Washington, DC, in a mixed humid climate. Moisture content of the sheathing and wall cavity temperatures were measured at various points in each wall section. The primary performance measure was moisture content of the wood-based structural sheathing. Under normal weather exposure, the studs and sheathing in all walls investigated remained well below moisture content. South-facing walls with direct solar exposure resulted in dyer sheathing. Walls with non-absorptive cladding (vinyl siding and insulated vinyl siding) had among the lowest sheathing moisture contents recorded in this was the case for walls that faced either north or south. Low sheathing moisture contents were also recorded in the south-facing walls with (a relatively dark color) manufactured stone cladding and in the south-facing wall with brick veneer cladding. Controlled injections of water behind the cladding indicated that some walls were less able to drain (or otherwise dissipate) the injected water than were others. Stucco-clad walls with only one layer of water-resistive barrier (WRB) showed the least ability to dissipate injected water Walls with manufactured stone cladding (which incorporated two layers of WRB) showed a lesser ability to dissipate injected water than walls with most of the other cladding systems, but greater ability than stucco-clad walls with a single layer of WRB.
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CitationDrumheller, S. Craig; Carll, Charles G. 2010. Effect of cladding systems on moisture performance of wood-framed walls in a mixed-humid climate. In: Thermal performance of the exterior envelopes of whole buildings XI international conference, 2010 December 5-9, Clearwater Beach, FL [electronic resource]. [Atlanta, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers], 2010: 12: [1 CD-ROM]: ISBN: 9781933742892.
KeywordsWeathering, sheathing, moisture, service life, buildings, wood moisture, building dampness, environmental engineering, humidity control, wooden buildings, building moisture, airtightness, walls, rain, rainfall, simulation methods, accelerated life testing, temperature, exterior walls, testing, cladding, ventilation, building materials, sheathing, exposure tests, durability, moisture content, moisture control, accelerated testing
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