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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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

Source: Buildings

Author(s)Boardman, Charles R.; Glass, Samuel V

Publication Year: 2020  View PDF »

Category: Journal Articles



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 feld study exploring the effects of exterior insulation on wall moisture performance in a cold-climate. The feld 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 feld measurements within measurement error. The most signifcant 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 fberglass insulation had higher permeance than literature values.

Keywords: moisture performance; durability; hygrothermal modeling; WUFI; effective permeance; kraft paper facing; building envelope; vinyl siding; oriented strand board; extruded polystyrene

Publication Review Process: Formally Refereed

File size: 10,240 kb(s)

Date posted: 03/12/2021

This publication is also viewable on Treesearch:  view
RITS Product ID: 10123
Current FPL Scientist associated with this product
Glass, Samuel V.
Research Physical Scientist

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