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Indoor and Built Environment
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A Humidity Dependent Vapour Retarder in Non-ventilated Flat Roofs. In Situ Measurements and Numerical Analysis

K. Ghazi Wakili

Laboratory for Applied Physics in Building, EMPA, Switzerland, karim.ghazi{at}empa.ch

Th. Frank

Laboratory for Applied Physics in Building, EMPA, Switzerland

The influence of a humidity dependent vapour retarder on the annual moisture distribution in thermally insulated flat roof constructions has been investigated by means of long term in situ measurements and two numerical simulation methods. It is shown that the simple Glaser method is not suitable to predict the moisture distribution in this type of construction under real climatic conditions and that only a transient hygrothermal analysis is able to reproduce the measured temperature and relative humidity. Based on both measurements and transient numerical simulations, the role of the vapour retarders for this type of constructions has been evaluated.

Key Words: Flat roof • humidity dependent • Moisture diffusion • Transient behaviour • Vapour retarder • Wood construction

Indoor and Built Environment, Vol. 13, No. 6, 433-441 (2004)
DOI: 10.1177/1420326X05047376
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