Effect of exfiltration on the hygrothermal behaviour of a residential wall assembly

Tuomo Ojanen, Kumar Kumaran

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)


    The hygrothermal behaviour of timber frame wall is analysed using a steady-state calculation method and a two-dimensional heat, air, and moisture transport computer model. The conditions associated with exfiltration of warm and humid indoor air are examined. The physical quantities investigated included the amount of moisture accumulated in the wall cavity during the heating season and the heat loss across the wall. Several interesting correlations between moisture accumula tion in a cavity and parameters such as leakage rate, vapour permeance characteristics of the exterior boundary, additional thermal resistance offered by an exterior sheath ing, and indoor humidity level emerge. These correlations show the advantage of us ing the analytical methods in deriving design guidelines for building components. The results from the analysis are used to identify and quantify various parameters that govern the performance of air barrier systems.
    Original languageEnglish
    Pages (from-to)215-227
    Number of pages13
    JournalJournal of Thermal Insulation and Building Envelopes
    Issue number3
    Publication statusPublished - 1996
    MoE publication typeA1 Journal article-refereed


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