Threshold values for mould growth: Critical moisture level of 21 different building materials
2020 (English)In: E3S Web of Conferences. Volume 172, 2020, EDP Sciences , 2020, article id 20002Conference paper, Published paper (Refereed)
Abstract [en]
The susceptibility for mould growth varies among different building materials. One way to describe the susceptibility is the lowest RH at which mould can grow on a specific material, the critical moisture level (RHcrit). Determining RHcrit for materials provide the basis for material choice in designs where moisture and temperature conditions are known. In this study, RHcrit of 21different products were determined according to SIS-TS 41:2014/SPMet 4927. This test method is developed based on the results of a variety of laboratory studies and validated by field studies. Test specimens were inoculated with a suspension containing spores from six different mould fungi and were then incubated in moisture chambers at four levels of RH at 22 °C. After 12 weeks specimens were analysed for mould growth. RHcrit was determined based on the lowest RH at which mould grew on the specimens. RHcrit varied among different products, even between product belonging to a similar group of material, for example, calcium silicate boards or gypsum boards. The results show, and confirm, previous findings that it is not possible to estimate RHcrit for a specific product based on material group. Instead, each product must be tested. © The Authors
Place, publisher, year, edition, pages
EDP Sciences , 2020. article id 20002
Keywords [en]
Building materials, Calcium silicate, Moisture, Moisture determination, Silicates, Testing, Calcium silicate boards, Laboratory studies, Material choice, Moisture chambers, Moisture level, Specific materials, Temperature conditions, Test specimens, Molds
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45619DOI: 10.1051/e3sconf/202017220002Scopus ID: 2-s2.0-85088433530OAI: oai:DiVA.org:ri-45619DiVA, id: diva2:1458810
Conference
12th Nordic Symposium on Building Physics, NSB 2020, 6 September 2020 through 9 September 2020
2020-08-182020-08-182023-06-05Bibliographically approved