Moisture safety of the construction with vcl using hygrobrid technology

Abstract

Unventilated and green flat roofs with wooden construction and insulation between the rafters are used in new buildings. Due to the external vapour-tight construction, such roofs have no drying capacity on the outside. The scope of this study is to assess whereas the wood degradation in the wood or OSB caused by wood destroying fungus can take place as this can affect the structural function of the construction. Results show, that the 3rd generation moisture variable vapour control layer, which has additional function that the Sd-value changes according to the direction of the diffusion, has many application areas. The behaviour of the vapour control layer has a positive effect on the moisture balance of an external vapour-tight green roof. The moisture and direction variable performance of the 3rd generation vapour control layer has also a positive effect on the moisture balance of an external vapour-tight pitched roof. It is important to underline that presented results are valid for Central-European climatic conditions.