| 摘要 |
PROBLEM TO BE SOLVED: To provide an expandable building material capable of maintaining mite prevention/antibacterial effect over a long period as well as the elimination of a substance causing a sick house syndrome or the like in the expandable building material used for a wall, a floor or the like of a building. SOLUTION: The expandable building material 1 is constituted of a building material body 11 and microcapsules 12 adhered to the building material body 1, a large number of microcapsules are adhered to the building material body 1 or contained therein, and the microcapsules 12 are made to collapse by at least secular change to spread Japanese cypress thiol contained in a liquid 122 in the microcapsules 12 in the air.
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