Wooden buildings are a traditional type of construction that has been gradually replaced by brick and monolithic technologies. The current trends lead up to use renewable materials even include different types of thermal insulations. The construction industry commonly use materials on a plant basis. If heat-humidity mode (in particular, increased humidity) is not balanced, suitable conditions for the growth of microorganisms are present. The common organisms occurring in/into natural based materials are mainly molds, bacteria, algae or wood decaying fungi. Biodegradability of plant based systems is a major drawback to using these materials in buildings. Given that condensation occurs in timber construction and materials from plant-based are susceptible to attacked by microorganisms, it is necessary to protect these materials. The paper deals with the possibility of protection of these insulation materials against mold using advanced nanotechnologies. The comparison of individual used measures is included.Keywords: thermal insulation, mold, material moisture, humidity
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