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Improving the Accuracy of a Hygrothermal Model for Wood-Frame Walls: A Cold-Climate Study

Building and Fire Sciences, US Forest Service Forest Products Laboratory, Madison, WI 53726, USA
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Buildings 2020, 10(12), 236; https://doi.org/10.3390/buildings10120236
Received: 15 November 2020 / Revised: 3 December 2020 / Accepted: 4 December 2020 / Published: 11 December 2020
A one-dimensional transient hygrothermal model was used to simulate eight different wood-frame wall assemblies. Simulations were compared with measured results from a two-year field study exploring the effects of exterior insulation on wall moisture performance in a cold-climate. The field study documented the moisture content, temperature, and relative humidity measurements in wall assemblies using oriented strand board (OSB) sheathing. Simulations were performed using generic design input values as well as input values based on measurements or sensitivity analysis. Laboratory material property measurements informed the choice of material property values in the improved model for OSB, asphalt-coated kraft paper, and interior latex paint. Simulations using improved input values typically agreed with field measurements within measurement error. The most significant model improvements were all related to vapor permeance. The vinyl siding used an effective permeance much lower than typically recommended. However, both the extruded polystyrene insulation and the asphalt-coated kraft paper facing on the cavity fiberglass insulation had higher permeance than literature values. View Full-Text
Keywords: moisture performance; durability; hygrothermal modeling; WUFI; effective permeance; kraft paper facing; building envelope; vinyl siding; oriented strand board; extruded polystyrene moisture performance; durability; hygrothermal modeling; WUFI; effective permeance; kraft paper facing; building envelope; vinyl siding; oriented strand board; extruded polystyrene
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MDPI and ACS Style

Boardman, C.R.; Glass, S.V. Improving the Accuracy of a Hygrothermal Model for Wood-Frame Walls: A Cold-Climate Study. Buildings 2020, 10, 236. https://doi.org/10.3390/buildings10120236

AMA Style

Boardman CR, Glass SV. Improving the Accuracy of a Hygrothermal Model for Wood-Frame Walls: A Cold-Climate Study. Buildings. 2020; 10(12):236. https://doi.org/10.3390/buildings10120236

Chicago/Turabian Style

Boardman, Charles R.; Glass, Samuel V. 2020. "Improving the Accuracy of a Hygrothermal Model for Wood-Frame Walls: A Cold-Climate Study" Buildings 10, no. 12: 236. https://doi.org/10.3390/buildings10120236

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