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Microbial activity can have an important impact on the durability of building materials. It is important to understand this activity in order to select appropriate treatment strategies for the repair and restoration of buildings and monuments. This paper describes the microorganisms which can modify the properties of building materials such as concrete, mortars, composites, timber, gypsum, etc., as well as the mechanisms responsible for deterioration of these materials. The information provided by the members of TC 183-MIB via a questionnaire is discussed. Techniques currently utilised and areas requiring further study are identified. In addition to the references, a list of publications for further reading completes this article.

To prove and evaluate the fungal load, present indoors identification of fungi up to species level is prerequisited. Therefore, the set-up of an external quality assurance system and the qualification of the lab workers will be required. In 2001, the working party "Quality Assurance - Fungi in Indoor Environments" - initiated by the Health Service, Baden-Wurttemberg (LGA BW), established an inter-laboratory test entitled "Identification of Indoor Fungi". Until now, 2 inter-laboratory tests are carried out based on pure cultures. In every inter-laboratory test 50 laboratories participated. Results will be represented and discussed. Carrying out the inter-laboratory test internationally is planned.