Reliable control of interstitial condensation in lightweight roof systems, calculation and assessment methods
Janssens, A.
1998 Ph.D., Katholieke Universiteit Leuven (Belgium)
Janssens, A., (1998), "Reliable control of interstitial condensation in lightweight roof systems, calculation and assessment methods", Ph.D., Katholieke Universiteit Leuven (Belgium).
Abstract: |
The general objective of the research is to develop calculation and assessment methods to improve the reliability of condensation control systems in lightweight roofs, considering the uncertainty to achieve continuity of airtightness in building practice. An assessment method has been developed based on a stochastic approach to moisture performance analysis and on concepts of industrial risk analysis. To predict the thermal and moisture performance of lightweight systems, a two-dimensional transient model has been developed for the combined heat, air and water vapour transfer in building components. The model allows for a two-domain description in terms of porous media and air channels.
The calculation method has been applied to produce a better understanding of the effects of air movement and discontinuities on the performance of lightweight roofs. The development of the assessment method involves the definition of design climate values for the evaluation of condensation risk due to air leakage, the definition of limit state values to assess the risk and the use of 'redundant' protective measures to reduce the risk. The research produces tools and recommendations for the design of lightweight roof systems with reliable control of interstitial condensation. |
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