SYMPOSIA PAPER Published: 01 January 2010
STP49024S

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

Source

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
Hokkaido Northern Regional Building Research Institute, Hokkaido, Japan
Hokoi, Shuichi
Kyoto Univ., Japan
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Details
Developed by Committee: C16
Pages: 83–105
DOI: 10.1520/STP49024S
ISBN-EB: 978-0-8031-8419-0
ISBN-13: 978-0-8031-7505-1