On the influence of cavity ventilation on moisture content in timber frame walls
Hansen, M. H., Nicolajsen, A. and Stang, B. D.
2002
6th Symposium on Building Physics in the Nordic Countries, Trondheim, Norway, Jun 17
Hansen, M. H., Nicolajsen, A. and Stang, B. D., (2002), "On the influence of cavity ventilation on moisture content in timber frame walls", 6th Symposium on Building Physics in the Nordic Countries, Trondheim, Norway, Jun 17.
| Abstract: |
| "... A ventilated cavity behind the cladding of timber frame walls is usually considered good practice in order to avoid moisture-induced damage in the construction. The functions of the cavity are multiple (Kumar 1998). The cavity allows for removal of moisture from the cladding through ventilation. Also, the cladding provides a path for gravity drainage path for penetrated rain to drain. Furthermore, a cavity acts as a capillary barrier. Finally, a vented cavity allows for pressure equalisation across the cladding when it acts as rainscreen. However, ventilating with dry air will remove moisture from the construction whereas ventilating with humid air might add moisture to the construction. Tenwolde, Carll and Malinauskas (1995) found "that cavity ventilation was not always successful at providing dry Simulations of heat and moisture conditions in timber frame walls were made using the model MATCH (Pedersen 1990). From the simulations it was seen that the most critical moisture conditions often were to be found behind the wind barrier. Also, the simulations indicated that a ventilated cavity behind the cladding might increase the moisture content behind the wind On the basis of the simulations two series of experiments were designed where full-size wall elements in a test building were exposed to natural climate on the outside and to a humid indoor climate on the inside. The results from the first series are described in (Andersen et al. 2002). The present paper describes a part of the results from the second series. |
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