Novel Method for Assessing the Protection Lifetime of Building Coatings against Fungi

The aim of this study was to develop a novel method for evaluating the service life of building coatings. In Stage 1, we assessed existing methods for determining the degree of fungal overgrowth on building materials (visual assessment, culture method, luminometric ATP (adenosine-5’-triphosphate) me...

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Veröffentlicht in:Coatings (Basel) 2023-12, Vol.13 (12), p.2026
Hauptverfasser: Szulc, Justyna, Komar, Michał, Kata, Iwona, Szafran, Krzysztof, Gutarowska, Beata
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container_issue 12
container_start_page 2026
container_title Coatings (Basel)
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creator Szulc, Justyna
Komar, Michał
Kata, Iwona
Szafran, Krzysztof
Gutarowska, Beata
description The aim of this study was to develop a novel method for evaluating the service life of building coatings. In Stage 1, we assessed existing methods for determining the degree of fungal overgrowth on building materials (visual assessment, culture method, luminometric ATP (adenosine-5’-triphosphate) measurement, and spectrophotometric assessment of colour changes). Laboratory tests were carried out for 19 types of facade coating (mineral and silicone with/without primer, silicone paint, biocides) and 7 fungal strains (moulds Alternaria alternata, Aspergillus niger, Aureobasidium melanogenum, Cladosporium cladosporioides, Fusarium sp., Penicillium citrinum, and the yeast Rhodotorula mucilaginosa). The number of fungi on the facade coatings after 28 days of incubation was 1.7 × 105–4.6 × 105 CFUs (colony-forming units)/sample. The ATP content was 12 RLUs–30333 RLUs (relative light units). Colour change was ΔE > 5 depending on the coating type and fungal strain. A high or very high correlation was found between the ATP concentration (RLUs), colour change (ΔE), and the results of the culture method (CFUs/sample). In Stage 2, a new methodology for evaluating the protection lifetime of building coatings against fungi was developed, taking into account environmental conditions (impact of ultraviolet radiation, precipitation, presence of organic matter on the surface, quantitative and qualitative composition of bioaerosol). The developed method consists of one research cycle conducted in the laboratory, corresponding to one year under natural conditions. Preliminary verification showed the model to be compatible with long-term observations (3 years) of fungal growth on the facade coatings under real environmental conditions. The novel method could be used to design biodeterioration control and protection strategies for both new and cultural heritage buildings.
doi_str_mv 10.3390/coatings13122026
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source MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Adenosine
Adenosine triphosphate
Bioaerosols
Biocides
Biodegradation
Building materials
Coatings
Color
Construction materials
Cultural property, Protection of
Cultural resources
Culture
Facades
Fungi
Historical buildings
Laboratory tests
Methods
Microorganisms
Mold
Organic matter
Precipitation
Primers (coatings)
Protection and preservation
Radiation
Service life assessment
Spectrophotometry
Ultraviolet radiation
Yeast
Zinc oxides
title Novel Method for Assessing the Protection Lifetime of Building Coatings against Fungi
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