Effect of ambient hygrothermal conditions on wood moisture content in the crawl spaces of wooden houses with insulated and airtight foundations as well as conventional foundations in Hokkaido and Akita

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  • OSAWA Tomoko
    Institute of Wood Technology, Akita Prefectural University Present Address：Morioka Junior College, Iwate Prefectural University
  • KURIMOTO Yasuji
    Institute of Wood Technology, Akita Prefectural University
  • DOI Shuichi
    Former Professor of University of Tsukuba

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Other Title
  • 基礎断熱を含む異なる基礎仕様の木造住宅の床下温湿度環境が木材含水率に及ぼす影響（北海道および秋田県の事例）
  • キソ ダンネツ オ フクム コトナル キソ シヨウ ノ モクゾウ ジュウタク ノ ユカシタオン シツド カンキョウ ガ モクザイ ガンスイリツ ニ オヨボス エイキョウ : ホッカイドウ オヨビ アキタケン ノ ジレイ

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Abstract

Over the past few decades, the methods used in the construction of foundations in Japan’s wooden houses have developed. Recently, even conventional foundations have been constructed using concrete to cover the soil, thereby making it moisture-proof. In addition, the use of another type of insulated and airtight foundation has increased, particularly in cold regions. However, insulated, airtight foundations have none of the openings for ventilation that are generally observed in conventional foundations. For this research, we conducted two surveys to examine the effects of humidity on wood in the crawl space of wooden houses under real living conditions. In one survey, the humidity levels in four houses with different foundations were monitored for one year. In the other survey, the humidity and moisture content in a house with insulated, airtight foundations were monitored for 17 years. Our findings showed that the crawl space environment in houses with insulated, airtight foundations had a low humidity of 40%-80% throughout the year. This finding suggests that insulated, airtight foundations posed no risk of causing high moisture content in the wood. In contrast, houses with conventional foundations with ventilation openings exhibited over 80% humidity in the summer. This finding suggests that conventional foundations may lead to the high moisture content in the wood. Furthermore, the humidity risk was higher in the house with moisture-proof-covered soil foundations than that in the house with uncovered soil foundations. This difference in humidity levels was due to the low temperature prevalent in the crawl space.

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