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Applied and Environmental Microbiology, February 2002, p. 963-967, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.963-967.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Microbial Growth Inside Insulated External Walls as an Indoor Air Biocontamination Source

Anna-Mari Pessi,1* Jommi Suonketo,2 Matti Pentti,2 Mika Kurkilahti,1,{dagger} Kaija Peltola,1 and Auli Rantio-Lehtimäki1

Section of Ecology, Department of Biology, University of Turku, FIN-20014 Turku,1 Faculty of Structural Engineering, Department of Civil Engineering, Tampere University of Technology, 33101 Tampere, Finland2

Received 6 November 2000/ Accepted 16 October 2001

The association between moisture-related microbial growth (mesophilic fungi and bacteria) within insulated exterior walls and microbial concentrations in the indoor air was studied. The studied apartment buildings with precast concrete external walls were situated in a subarctic zone. Actinomycetes in the insulation layer were found to have increased concentrations in the indoor air. The moisture content of the indoor air significantly affected all measurable airborne concentrations.

* Corresponding author. Mailing address: University of Turku, Department of Biology, Section of Ecology, FIN-20014 Turku, Finland. Phone: 358-2-333 6395. Fax: 358-2-333 5565. E-mail: anna-mari.pessi{at}utu.fi.

{dagger} Present address: Leiras Ltd., P.O. Box 415, FIN-20101 Turku, Finland.

Applied and Environmental Microbiology, February 2002, p. 963-967, Vol. 68, No. 2
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.2.963-967.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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