Most studies on mould development on wood material have been made at constant moisture conditions during the experimental period. As a consequence of such studies, a maximum permittable humidity level to avoid mould problems in wood constructions has been recommended. In the practical situation, the constructions are seldom subject to constant humidity or temperature. In the present paper, we report on studies on mould growth on wood during controlled fluctuations of the humidity conditions. The results indicate less adaptability to moisture fluctuations at higher temperatures.

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