Hygrothermal performance of a vapor-open envelope for subtropical climate, field test and model validation
Artikel i vetenskaplig tidskrift, 2016

The construction industry is known to be a key contributor to manmade climate change. Amongst other nations, Japan has a building energy efficiency goal which does not yet emphasize the importance of the moisture safety design of well-insulated building envelopes considering its diverse climatic conditions. The authors developed a vapor-open wooden building envelope for the subtropical conditions of Japan and optimized a design method, which considers environmental, economic and hygrothermal aspects. As a case study, a detached residential building has been constructed in Ohmihachiman (central Japan). The building has been monitored using a large number of temperature and humidity sensors inside the walls and the roof. Results have been obtained from measurements over a period of one year. Furthermore, transient hygrothermal simulations using the measured exterior and interior climates have been carried out. It was shown that 1) the construction of the wall was successful with the desired level of air-tightness and 2) the simulation model by a commercial software is applicable for predicting the hygrothermal performance of the wall with the envelope system in the actual use condition.

Sustainable building envelope

Wood fiber insulation

Remote monitoring

Transient heat and moisture transfer


Japanese climate


Yutaka Goto

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Karim Ghazi Wakili


York Ostermeyer

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Angela Sasic Kalagasidis

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Holger Wallbaum

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

Building and Environment

0360-1323 (ISSN)

Vol. 110 55-64


Hållbar utveckling


Building Futures





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