Volume 6, Issue 9 (October 2009)

    Measurement of Water Permeability of Roof Tiles and Influence of Entrapped Air

    (Received 18 July 2008; accepted 30 June 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    Freezing damage in roof tiles is caused by a temperature drop in conjunction with a percent of saturation inside the tile. In order to understand the freezing-thawing process, it is necessary to know the moisture transport characteristics of a roof tile. In general, Japanese roof tiles have surface finishes. In this study, the water permeability of roof tiles with and without surface finishes was measured. The measured results showed that tiles with surface finishes had water resistances a few thousand-fold higher than tiles without surface finishes. Furthermore, it appears that the air entrapped within the tile has a significant influence on moisture transport in the tile. The influence of air was examined by numerical analysis, which demonstrated that an increase in the entrapped air pressure suppressed water infiltration.


    Author Information:

    Iba, Chiemi
    Researcher, Hokkaido Northern Regional Building Research Institute,

    Hokoi, Shuichi
    Professor, Kyoto Univ.,


    Stock #: JAI102030

    ISSN: 1546-962X

    DOI: 10.1520/JAI102030

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    Author
    Title Measurement of Water Permeability of Roof Tiles and Influence of Entrapped Air
    Symposium Second Symposium on Heat-Air-Moisture Transport: Measurements and Implications in Buildings, 2009-04-20
    Committee C15