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Validation of critical moisture conditions for mould growth on building materials
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
2013 (English)In: Building and Environment, Vol. 62, 201-209 p.Article in journal (Refereed) Published
Abstract [sv]

Materials that are stored or used in damp conditions may be subject to mould growth. However, all materials are not equally susceptible; for each specific material, there is a critical moisture level for mould growth. If this is exceeded, there is a risk that mould fungi will develop on the material. This level can be determined in accelerated laboratory tests, at constant temperatures and relative humidity (RH) favourable to mould growth. Within a building however, these parameters are expected to vary from one part of the construction to another, and are seldom constant; there is fluctuation in temperature and RH due to seasonal or shorter-term variations. In this study, test pieces of the same materials tested in a laboratory environment were placed in three outdoor ventilated crawl spaces and three outdoor ventilated attics, where the temperature and RH varied, and mould growth on the test pieces was studied over 2.5 years. Material-specific mould growth curves were produced based on critical moisture levels, as determined in laboratory experiments under constant temperature and RH. When the actual conditions of RH and temperature exceeded these curves, there was mould growth on the test pieces if the time was sufficiently long. The conclusion from the study is that although conditions in laboratory studies are simplified and accelerated, the results serve well to indicate mould growth within a building construction.

Place, publisher, year, edition, pages
2013. Vol. 62, 201-209 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6455Local ID: 14986OAI: oai:DiVA.org:ri-6455DiVA: diva2:964293
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2017-01-31Bibliographically approved

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SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi )SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh)
Natural Sciences

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