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Buildings 2017, 7(4), 99; doi:10.3390/buildings7040099

Measurement of Thermal Properties of Growing Media for Green Roofs: Assessment of a Laboratory Procedure and Experimental Results

Construction Technologies Institute of National Research Council of Italy, Via Lombardia 49, San Giuliano Milanese, 20098 Milano, Italy
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Received: 4 August 2017 / Revised: 3 October 2017 / Accepted: 18 October 2017 / Published: 26 October 2017
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Abstract

While the Italian standard UNI 11235:2015 establishes minimum performance criteria, the thermal resistance of the growing medium of green roofs is not included in national regulations. Instead, thermal transmittance limits for roofs are obtained by referring to other stratigraphic layers. In the absence of specific national and international standards for laboratory calculations of the thermal performance of growing media for green roofs, a multi-year laboratory testing campaign was carried out on 8 samples which aimed to define the thermal resistance reference values of growing media as a function of density and water content. Thermal conductivity varies between 0.046–0.179 W/mK for dry samples as a function of density and between 0.046–0.47 W/mK as a function of moisture content. Defining a reference method, laboratory tests and restitution of the output in performance curves, was based on 108 tests carried out according to and deviating from the standard based on both guarded hot plate and heat flow meter methods. The significance of the results has prompted researchers and industrial partners to engage in further investment and ongoing tests in this area, targeting the definition of a standard laboratory method to be presented worldwide. View Full-Text
Keywords: growing media; green roofs; thermal properties; laboratory tests; buildings; energy growing media; green roofs; thermal properties; laboratory tests; buildings; energy
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MDPI and ACS Style

Barozzi, B.; Bellazzi, A.; Maffè, C.; Pollastro, M.C. Measurement of Thermal Properties of Growing Media for Green Roofs: Assessment of a Laboratory Procedure and Experimental Results. Buildings 2017, 7, 99.

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