Residential buildings, during their lifetime, even while maintaining all available high-quality materials, are exposed to e.g. improper humidity or aeration engendering uncontrolled occupation by a variety of microorganisms, especially moulds. Besides the aspect of human health, such microorganisms must possess specific biochemical mechanisms, allowing them to colonize uncommon niches. The inquired 19 fungal strains, isolated from walls and slats of building interiors in Opole and Lower Silesia were tested for their enzymatic activities relevant from biotechnological point of view. It was demonstrated that the expression of cellulases (max 0.08 U/mg), xylanases (0.28 U/mg), polygalacturonases (0.018 U/mg), chitinases (0.048 U/mL) and laminarinases (0.43 U/mL) was inherent in the majority of the isolates.

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