The Effect of Anisotropy of Building Materials on the Moisture Transfer


  • J. Drchalová
  • R. Černý
  • J. Havrda


The effect of anisotropy of building materials on the moisture transfer in the design of envelope parts of building structures is studied. Two typical fibre containing plate building materials produced in the Czech Republic, Dekalux and Dekalit P, are chosen for the demonstration of this effect. Experimental results show that while for lighter Dekalit P, an order of magnitude difference in the moisture diffusivities k for the two basic orientations, i.e. along and across the plate, is observed, for the heavier Dekalux the differences in k are within the errorbar of the experimental method. As follows from the experimental results, compacting of surface layers of the plates of light fibred materials is very favorable from the point of view of moisture penetration but one should keep in mind that any local damage of the surface layer can result in a considerably faster moisture transfer in the direction along the plate.


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Author Biographies

J. Drchalová

R. Černý

J. Havrda



How to Cite

Drchalová, J., Černý, R., & Havrda, J. (2000). The Effect of Anisotropy of Building Materials on the Moisture Transfer. Acta Polytechnica, 40(2). Retrieved from