Temperature regime of planted roofs compared with conventional roofing systems |
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| Authors: | Alar Teemusk Ülo Mander |
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| Institution: | 1. Institute of Future Cities, Chinese University of Hong Kong, New Territories, Hong Kong;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong;3. School of Architecture, Chinese University of Hong Kong, New Territories, Hong Kong;1. Division of Forest, Nature and Landscape, KU Leuven, Celestijnenlaan 200E, 3001 Heverlee, Belgium;2. CNRS-IMBE, IUT Avignon, Site Agroparc BP 61207, 84911 Avignon Cedex 9, France;3. Max Planck Institute for Biogeochemistry, Hans Knoell Str. 10, 07745 Jena, Germany;1. Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Geology, Faculty of science, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. The Centre for Research in Biotechnology for Agriculture, University of Malaya, 50603 Kuala Lumpur, Malaysia;4. Faculty of Science & Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia;1. University of Balamand, Chemical Engineering Department, El Koura, North Lebanon, PO Box: 100-Tripoli, Lebanon;2. University of La Rochelle, Laboratory of Engineering Science for Environment LaSIE, Michel Crépeau Avenue, 17042, La Rochelle Cedex 1, France |
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| Abstract: | This paper analyses the temperature regime of an existing green roof and a sod roof, compared with a modified bituminous membrane roof and a steel sheet roof. The measurement period was from June 2004 to December 2007 at three different measurement locations. Results are given both seasonally and daily; indexes to characterize the effects of the temperature of planted roofs are also proposed. In summer, temperatures under both the green roof (100 mm) and the sod roof (150 mm) showed a similar temperature run; undesirable higher temperatures on the surfaces did not cause a notable increase in temperature under the substrate layers. The difference between the temperature amplitude under the substrate layers of the planted roofs and the surfaces of the conventional roofs was on average 20 °C. In autumn and spring, the sod roof's soil layer showed higher temperatures and lower amplitude than the green roof's substrate layer, which cooled more. In winter, temperatures under the substrate layers of the planted roofs were higher than the surfaces of the conventional roofs; average amplitude was 1 °C and 7–8 °C, respectively. |
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