Drying of timber-framed wall structures
Vinha, J.
2000
Healthy Buildings 2000, vol. 3, pp. 203
air tightness, convection, diffusion, drying, insulation, moisture, structure, test room
Vinha, J., (2000), "Drying of timber-framed wall structures", Healthy Buildings 2000, vol. 3, pp. 203.
| Abstract: |
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This research continues our study of the moisture behaviour of different timber-framed external wall structures. The object of this research is, firstly, to find out how the water vapour permeability values and equilibrium moisture contents of building materials change under different temperature and humidity conditions. Usually most of the material tests are carried out at about +20 ˇăC temperature. However, in Nordic countries outdoor temperature can be significantly lower, even under 0 ˇăC. Humidity is also typically higher outside than in the laboratory test condi-tions. Secondly, we wish to find out how different kinds of wall structures absorb moisture and also
how they dry. The inside boards and windshields have a big impact on these behaviour mechanisms. The effects of various thermal insulation materials will also be determined. In this part of the research we will test entire wall structures by means of our building physical test equipment. With the equipment we will be able to control indoor and outdoor conditions (temperature, relative humidity and pressure difference) as we wish. The behaviour of structures can be monitored during tests under controlled conditions without disturbances. The building physical test equipment was developed during our last research project. The study is part of the Healthy Building technology programme of the TEKES (Technology Development Centre of Finland). The research will take about 3.5 years it started in November 1999. TEKES and nine companies will takes a part in this research. TEKES finances 65 % and the companies 35 % of total costs. |
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