This paper presents the results of the development of low-energy log walls that have internal thermal insulation. Dimensions for moisture-safe applications of interior thermal insulation of log walls under cold climate conditions have been studied with different vapor resistance levels of the inside air/vapor barrier layer. When additional ventilation was required, a local and limited ventilation concept was used to keep the ventilation heat losses low. Design and dimensioning of the required ventilation airflow rates were done using hygrothermal numerical simulation studies. The results under different interior sheathing and moisture load conditions are presented in this paper, and the thermal and moisture performance characteristics of the presented wall system are studied and discussed.

Presented at Thermal Performance of Exterior Envelopes of Whole Buildings X – December 2007

Units: SI