| Summary: | The method of identification of the water vapour permeability resistance of finishing layers of
composite thermal insulation facade systems that have thin external plaster layers was developed
by the authors. The above systems comprise one layer of the heat insulation material that has a 5
mm finishing coating. This system is fastened to the building wall. The method is based on the results
of an experiment held to identify the resistance of all systems to the water vapour permeability
irrespective of the availability of finishing layers.
The proposed method is more accurate than any of the previously known methods that contemplate
the experimental determination of coefficients of water vapour permeability of materials
of finishing layers and subsequent calculation of the overall resistance to the water vapour. The
State Standard «Method of Determination of Resistance to the Water Vapour Permeability» that
implements the «wet cup» technology has been applied. The method has been employed to identify
the resistance of finishing layers of BAUMIT insulation system to the water vapour permeability.
BAUMIT has a thermal insulation layer made of mineral cotton. It has been identified that the overall
resistance of the finishing layer to the water vapour permeability, as determined in accordance with
the methodology developed by the authors, is twice as less efficient than the overall resistance
identified in accordance with prior methodologies. This difference in the characteristics of finishing
layers essentially raises the accuracy of projections of the moisture behaviour of all composite facade
insulation systems that have thin external plaster layers.
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