A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Water vapour transfer properties of spunbonded plastic films
The effect of the presence of condensation on water vapour transfer has been measured for two types of spunbonded roof plastic films. Results obtained from isothermal water vapour transmission tests were compared to measurement results of a non-isothermal test method, developed for this research. The water vapour transfer properties of the spunbonded plastic films determined during condensation conditions (non-isothermal method) were in good agreement with the values measured in isothermal wet cup. This indicated that the presence of condensation on the surface of the films did not have a significant influence on the vapour permeance of the films. The vapour transfer properties of the films did not show a large dependence of average relative humidity. Because spunbonded plastic films are generally applied on the outside of the building envelope (high relative humidity during winter), the values listed are the average wet cup values. The PP(0.55)-film has about half the water vapour difusion resistance of the PE(0.20)-film. Both values are very small compared to other plastic films or construction layers.
Water vapour transfer properties of spunbonded plastic films
The effect of the presence of condensation on water vapour transfer has been measured for two types of spunbonded roof plastic films. Results obtained from isothermal water vapour transmission tests were compared to measurement results of a non-isothermal test method, developed for this research. The water vapour transfer properties of the spunbonded plastic films determined during condensation conditions (non-isothermal method) were in good agreement with the values measured in isothermal wet cup. This indicated that the presence of condensation on the surface of the films did not have a significant influence on the vapour permeance of the films. The vapour transfer properties of the films did not show a large dependence of average relative humidity. Because spunbonded plastic films are generally applied on the outside of the building envelope (high relative humidity during winter), the values listed are the average wet cup values. The PP(0.55)-film has about half the water vapour difusion resistance of the PE(0.20)-film. Both values are very small compared to other plastic films or construction layers.
Water vapour transfer properties of spunbonded plastic films
Die Wasserdampfdurchlässigkeitseigenschaften von Spinnvlies-Plastikfolien
Janssens, A. (author) / Hens, H. (author)
Journal of Thermal Insulation and Building Envelopes ; 21 ; 202-220
1997
19 Seiten, 6 Bilder, 6 Tabellen, 9 Quellen
Article (Journal)
English
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