Study on identification and growth risk of mould in building envelopes

Mould growth in building envelopes not only affects the thermal performance of the envelopes, but also harms the indoor air quality and the personnel health. Taking a residential community in Shanghai as the research object, identifies the mould genus in the building envelopes by field collection and high-throughput DNA sequencing. Based on the identification results, establishes an isopleth model for mould growth risk prediction by selecting the culture data of corresponding mould genus in the literature. Based on the function between mould growth rate and relative humidity at the optimum temperature, modifies the above model and obtains the temperature and humidity boundary LIM 0 of mould growth. Defines the mould growth factor to characterize the effects of different building materials on mould growth, and provides the mould growth factors of common building materials. Based on the above model, analyses the mould growth risk of typical building envelopes in Shanghai. The results show that the main genus of mould growing on building envelopes are Cladosporium, Penicillium and Aspergillus. Controlling indoor relative humidity and choosing suitable finishing materials are two feasible ways to prevent the growth of mould.