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Ecological Insulation Materials - Does Sorption Moisture Affect their Insulation Performance?

ECOLOGICAL INSULATION MATERIALS are growing in popularity, but until now their share of the European insulation market is below 10%. The problem is that architects, engineers or builders have too little information about the advantages and the correct application of these materials. For common insulation materials (mineral wool, polystyrene foam) the hygrothermal material properties are well-known but not enough data are available for ecological insulation materials. Since they usually have rather high hygroscopic moisture contents, building standards prescribe that a formal increase be added to measured dry values to arrive at the design values for thermal conductivity. By combination of measurement and calculation of the heat flux in a hot plate apparatus [1] it is possible to investigate the hygrothermal processes involved in these measurements and to answer the question whether their hygroscopic moisture content really affects their insulation performance.