The influence of mineral wool and loose-fill cellulose wool on biodeterioration of pine sapwood was studied. The test fungi were mould fungi Aspergillus versicolor, Cladosporium sphaerospermum, Penicillium sp. and Aureobasidium pullullans and brown rot fungus Coniophora puteana. Cellulose wool inhibited the growth of mould fungi on the face of wood contacted with insulation material at RH of 97 and 100%. During 6 months' incubation boron compounds added in cellulose wool diffused into the wood. No growth of brown rot fungus was detected in "treated wood". Mineral wool had no preventive effect on the growth of mould fungi and brown rot fungus Coniophora puteana.

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