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Experiments on a method to measure mold concentration in a wall cavity using a Teflon tube.

Number: pap. 711

Author(s) : HIROMI Y., MOTOYA H., HARUKI O., et al.

Summary

Vapor condensation in the insulation material is an important factor of mold growth in the wall cavity. The indoor mold concentration depends not only on the indoor mold source but also on infiltration from concealed spaces. In order to measure the mold concentration in the wall cavity, a new method to take a sample of air from the cavity is needed. A method using a Teflon tube is useful to insert it in the thin spaces of wall cavities or crawl spaces. The surface of Teflon is very smooth but the mold may absorb the surface because of the friction or the static electricity. In this study, the method of measuring mold concentration with the Teflon tube was investigated. After the mold was emitted in the small chamber, falling bacteria with PDA plate at bottom of the small chamber was collected and the mold in the air was sampled with a membrane filter which catches bigger obstacles than 0.8µm through the Teflon tube which length are 0.3m, 0.5m and 1m. Remained mold on the inside of tube was washed by physiological salt solution and the mold was caught with a membrane filter in a sterifil-filter-holder. Every mold was kept in thermostat chamber at 38? for two days. The results of these experiments showed that the rate of mold retention increases with an increase in length. In the case of a 0.3 m long Teflon tube, the rate of retention was better than 5%.

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Pages: 10 p.

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Details

  • Original title: Experiments on a method to measure mold concentration in a wall cavity using a Teflon tube.
  • Record ID : 30009623
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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