A field test on susceptibility of wood-based board materials to mould growth was carried out under practical, but severe, service-conditions. A total of 19 commercially available composite boards were investigated. It was found that all board materials tested were not completely immune to mould attack. Test results revealed that among the three main categories of wood-based boards involved, particleboards were the most susceptible, followed by fiberboards. Plywoods were less susceptible to mould growth. The test also showed that among various types of board materials, the asphalted fiberboard, the particleboards made from birch wood shavings, and wood-industry residues were the most vulnerable to mould growth.

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