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Moisture redistribution in full-scale wood-frame wall assemblies: measurements and engineering approximationAuthor(s): Charles R. Boardman; Samuel V Glass; Samuel L. Zelinka
Source: Buildings. 10(8): 141. 25 p.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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Improving the Tools and Practice for Designing Moisture-Safe Wood Buildings
DescriptionA counter-balanced mass measurement system was constructed to allow measurement of water loss from a full-scale wood-framed wall assembly. Water was injected onto a localized area of paper towel adjacent to the oriented strand board (OSB) wall sheathing. Moisture pins in the OSB and relative humidity/temperature sensors inside the insulated wall cavity monitored conditions as the wall dried out. The wetted OSB area’s moisture content dropped at a faster rate than the total mass of the wall, indicating moisture redistribution within the wall. A simple model was used to calculate overall moisture redistribution, which was characterized using a near-exponential decay function. This simplifcation of the inherently three-dimensional physics of moisture redistribution could be incorporated into the one-dimensional hygrothermal models often used in research and engineering practice.
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CitationBoardman, Charles R.; Glass, Samuel V.; Zelinka, Samuel L. 2020. Moisture redistribution in full-scale wood-frame wall assemblies: measurements and engineering approximation. Buildings. 10(8): 141. 25 p.
KeywordsMoisture performance, moisture redistribution, drying potential, building envelope, oriented strand board, mass balance
- Hygrothermal modeling of wall drying after water injection
- Improving the Accuracy of a Hygrothermal Model for Wood-Frame Walls: A Cold-Climate Study
- Hygrothermal Anaylsis of Wood-Frame Wall Assemblies in a Mixed-Humid Climate
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