Fungal growth and survival in building materials under fluctuating moisture and temperature conditions

Anna-Liisa Pasanen (Corresponding Author), Jukka-Pekka Kasanen, Sirpa Rautiala, Jussi Ikäheimo, Jouko Rantamäki, Hannu Kääriäinen, Pentti Kalliokoski

Research output: Contribution to journalArticleScientificpeer-review

86 Citations (Scopus)

Abstract

Growth and viability of fungi on three building materials under moistening and drying conditions were investigated in the laboratory. The materials were taken from buildings under repair and no additional inoculation of fungi was used. The materials underwent four treatments (4–8 weeks of each): capillary absorption of water, drying in air at a relative humidity (RH) of 30%, condensation and finally drying at 50% RH. Moisture content (MC), equilibrium relative humidity (ERH), and concentrations of culturable fungi, actinomycetes and total spores were determined in the materials at 1- or 2-week intervals. The results showed that when water was absorbed by capillary action to the materials, fungal growth started fast and was abundant in the wood-based materials with MC above 20%. Such a limit value could not be defined for fungal contamination in the gypsum board because of complex behaviour of moisture between the gypsum bulk and paper covering. The condensation under the varying RH and temperature conditions caused only restrained fungal growth in the materials. The fast drying (RH 30%) seemed to decrease the viability of fungi but along with the experiment fungal flora was modified to tolerate fluctuating conditions and the drying at RH 50% had only a slight effect on the viability of fungi.
Original languageEnglish
Pages (from-to)117 - 127
Number of pages11
JournalInternational Biodeterioration and Biodegradation
Volume46
Issue number2
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

Fingerprint

Humidity
relative humidity
Fungi
Atmospheric humidity
Moisture
moisture
Drying
Temperature
fungus
Growth
Calcium Sulfate
viability
temperature
Gypsum
gypsum
condensation
Condensation
moisture content
Capillary Action
Water

Keywords

  • biocontamination
  • drying
  • gypsum board
  • moistening
  • fungi
  • mould fungi
  • moulds
  • particle board
  • viability
  • wood
  • building materials

Cite this

Pasanen, Anna-Liisa ; Kasanen, Jukka-Pekka ; Rautiala, Sirpa ; Ikäheimo, Jussi ; Rantamäki, Jouko ; Kääriäinen, Hannu ; Kalliokoski, Pentti. / Fungal growth and survival in building materials under fluctuating moisture and temperature conditions. In: International Biodeterioration and Biodegradation. 2000 ; Vol. 46, No. 2. pp. 117 - 127.
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abstract = "Growth and viability of fungi on three building materials under moistening and drying conditions were investigated in the laboratory. The materials were taken from buildings under repair and no additional inoculation of fungi was used. The materials underwent four treatments (4–8 weeks of each): capillary absorption of water, drying in air at a relative humidity (RH) of 30{\%}, condensation and finally drying at 50{\%} RH. Moisture content (MC), equilibrium relative humidity (ERH), and concentrations of culturable fungi, actinomycetes and total spores were determined in the materials at 1- or 2-week intervals. The results showed that when water was absorbed by capillary action to the materials, fungal growth started fast and was abundant in the wood-based materials with MC above 20{\%}. Such a limit value could not be defined for fungal contamination in the gypsum board because of complex behaviour of moisture between the gypsum bulk and paper covering. The condensation under the varying RH and temperature conditions caused only restrained fungal growth in the materials. The fast drying (RH 30{\%}) seemed to decrease the viability of fungi but along with the experiment fungal flora was modified to tolerate fluctuating conditions and the drying at RH 50{\%} had only a slight effect on the viability of fungi.",
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Fungal growth and survival in building materials under fluctuating moisture and temperature conditions. / Pasanen, Anna-Liisa (Corresponding Author); Kasanen, Jukka-Pekka; Rautiala, Sirpa; Ikäheimo, Jussi; Rantamäki, Jouko; Kääriäinen, Hannu; Kalliokoski, Pentti.

In: International Biodeterioration and Biodegradation, Vol. 46, No. 2, 2000, p. 117 - 127.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Fungal growth and survival in building materials under fluctuating moisture and temperature conditions

AU - Pasanen, Anna-Liisa

AU - Kasanen, Jukka-Pekka

AU - Rautiala, Sirpa

AU - Ikäheimo, Jussi

AU - Rantamäki, Jouko

AU - Kääriäinen, Hannu

AU - Kalliokoski, Pentti

PY - 2000

Y1 - 2000

N2 - Growth and viability of fungi on three building materials under moistening and drying conditions were investigated in the laboratory. The materials were taken from buildings under repair and no additional inoculation of fungi was used. The materials underwent four treatments (4–8 weeks of each): capillary absorption of water, drying in air at a relative humidity (RH) of 30%, condensation and finally drying at 50% RH. Moisture content (MC), equilibrium relative humidity (ERH), and concentrations of culturable fungi, actinomycetes and total spores were determined in the materials at 1- or 2-week intervals. The results showed that when water was absorbed by capillary action to the materials, fungal growth started fast and was abundant in the wood-based materials with MC above 20%. Such a limit value could not be defined for fungal contamination in the gypsum board because of complex behaviour of moisture between the gypsum bulk and paper covering. The condensation under the varying RH and temperature conditions caused only restrained fungal growth in the materials. The fast drying (RH 30%) seemed to decrease the viability of fungi but along with the experiment fungal flora was modified to tolerate fluctuating conditions and the drying at RH 50% had only a slight effect on the viability of fungi.

AB - Growth and viability of fungi on three building materials under moistening and drying conditions were investigated in the laboratory. The materials were taken from buildings under repair and no additional inoculation of fungi was used. The materials underwent four treatments (4–8 weeks of each): capillary absorption of water, drying in air at a relative humidity (RH) of 30%, condensation and finally drying at 50% RH. Moisture content (MC), equilibrium relative humidity (ERH), and concentrations of culturable fungi, actinomycetes and total spores were determined in the materials at 1- or 2-week intervals. The results showed that when water was absorbed by capillary action to the materials, fungal growth started fast and was abundant in the wood-based materials with MC above 20%. Such a limit value could not be defined for fungal contamination in the gypsum board because of complex behaviour of moisture between the gypsum bulk and paper covering. The condensation under the varying RH and temperature conditions caused only restrained fungal growth in the materials. The fast drying (RH 30%) seemed to decrease the viability of fungi but along with the experiment fungal flora was modified to tolerate fluctuating conditions and the drying at RH 50% had only a slight effect on the viability of fungi.

KW - biocontamination

KW - drying

KW - gypsum board

KW - moistening

KW - fungi

KW - mould fungi

KW - moulds

KW - particle board

KW - viability

KW - wood

KW - building materials

U2 - 10.1016/S0964-8305(00)00093-7

DO - 10.1016/S0964-8305(00)00093-7

M3 - Article

VL - 46

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EP - 127

JO - International Biodeterioration and Biodegradation

JF - International Biodeterioration and Biodegradation

SN - 0964-8305

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ER -