To predict the mathematical isopleths model for the growth of fungal mycelium in building material. The mould fungal growth is one of the first signs of biological growth linked to relative humidity and temperature condition in buildings materials. The numerical growth model was based on several models are found in literature. Quantification of fungal growth in the model is based on mould index used in the experiments for visual inspection. This model consists of differential equations describe the growth rate of the fungal growth index in vary fluctuating conditions including the effect of exposure time, temperature, relative humidity and dryness. Up to now the mathematical isopleth model to assess the fungal mould growth which is based on steady boundary conditions. This study presented new results for mathematical isopleth of mould growth on the surface of building materials such as wood, cement, concrete.
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