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Hygrothermal simulation of exterior retrofits in a cold climate...

by Antonio J Aldykiewicz Jr, Andre O Desjarlais, Garrett Mosiman, Patrick Huelman
Publication Type
Conference Paper
Book Title
6th Residential Building Design & Construction Conference (RBDCC)
Publication Date
Publisher Location
Pennsylvania, United States of America
Conference Name
6th Biennial Residential Building Design and Construction Conference (RBDCC)
Conference Location
State College, Pennsylvania, United States of America
Conference Sponsor
Penn State University
Conference Date

This work presents results from moisture modeling as part of a project undertaken by Pacific Northwest National Laboratory and its research partners, the University of Minnesota, and the Oak Ridge National Laboratory. The research goal is to identify exterior wall retrofit systems for cold climates that are low cost, energy efficient, and do not result in moisture durability problems. A base case wall was identified representing a typical wood frame construction, circa 1950. Retrofit options were selected based on input from industry, academia, and published work and seven options were constructed and installed at the University of Minnesota’s cold weather exposure facility in Cloquet, MN. Measurements were carried out during winter months and the data was used for model validation. Hygrothermal simulations were then carried out using WUFI (Version 6.4) in accordance with standard ANSI/ASRHAE 160-2016, Criteria for Moisture-Control Design Analysis in Buildings. Simulations were run out to three years and results show that the exterior retrofits improve thermal performance and do not negatively impact moisture durability of the existing wall.