Monitoring of the Moisture Content of Straw Bale Walls
This paper describes an investigation into moisture levels in straw bale walls used to clad a newly constructed building. The moisture content was monitored up to 10 months after the building was handed over. The sensors used for this purpose were readily available, low cost and easily installed. The moisture levels fluctuate during the first 4 months following installation of the instrumentation, followed by a period of greater stability where it is believed that the straw acts as a moisture buffer, managing the humidity levels within the building and contributing to a healthier internal environment. This ongoing study makes a contribution towards raising confidence levels in the use of straw bales as low carbon building material in mainstream construction.
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- 1.King, B.: Design of Straw Bale Buildings. Green Building Press, San Rafael (2006)Google Scholar
- 2.Wooley, T.: Natural Building. Crowood Press, Marlborough (2006)Google Scholar
- 3.Grandsaert, M.: A Compression Test of Plastered Straw-Bale Walls. In: Proceedings of the First International Conference on Ecological Building Structure, San Rafael, 43 p. (2001)Google Scholar
- 4.Nichols, J., Raap, S.: Straw Bale Shear Wall Lateral Load Test. In: Proceedings of the First International Conference on Ecological Building Structure, San Rafael, 24 p. (2001)Google Scholar
- 5.Faine, M., Zhang, J.: A Pilot Study Examining the Strength, Compressibility and Serviceability of Rendered Straw Bale Walls for Two Storey Load Bearing Construction. In: Proceedings of the First International Conference on Ecological Building Structure, San Rafael, 14 p. (2001)Google Scholar
- 6.Walker, P.: Compression Load Testing of Straw Bale Walls, Technical Report. University of Bath (2004), http://people.bath.ac.uk/abspw/straw%20bale%20test%20report.pdf (Accessed September 9, 2008)
- 7.Acharya, C.N.: Studies on the anaerobic decomposition of plant materials. Biochem. J. 29, 528–541 (1935)Google Scholar
- 8.Summers, M.D.: Moisture and Decomposition in Straw: Implications for straw bale construction. In: King, B. (ed.) Design of Straw Bale Buildings. Green Building Press, San Rafael (2006)Google Scholar
- 9.Canada Mortgage and Housing Association, Straw Bale Moisture Sensor Study (2000), http://www.cmhc-schl.gc.ca/publications/en/rh-pr/tech/96-206.pdf (Accessed January 27, 2009)
- 10.Lawrence, M., Heath, A., Walker, P.: Determining moisture levels in straw bale construction. Construction and Building Materials (in press)Google Scholar
- 12.Malmquist, L.: Sorption as deformation of space. Kylteknisk Tydskrift 4, 49–57 (1958)Google Scholar
- 14.Hedlin, C.P.: Sorption Isotherms of five types of grain straw at 70ºF. Canadian Agricultural Engineering 9(1) (1967)Google Scholar
- 15.Penner, E.: Suction and its use as a measure of moisture contents and potentials in porous materials. In: Proceedings of the International Symposium on Humidity and Moisture, Washington DC, IV, pp. 245–252 (1963)Google Scholar