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Green Roofs and Greenpass
Open AccessArticle

Heat Transfer Behavior of Green Roof Systems under Fire Condition: A Numerical Study

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NSERC Industrial Research Chair on Eco-responsible Wood Construction (CIRCERB), Department of Wood and Forest Sciences, Université Laval, Québec G1V 0A6, QC, Canada
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FPInnovations, Québec G1V 4C7, QC, Canada
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Department of Civil and Water Engineering, Université Laval, Québec G1V 0A6, QC, Canada
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Université du Québec à Chicoutimi (UCAQ), Chicoutimi G7H 2B1, QC, Canada
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Author to whom correspondence should be addressed.
Buildings 2019, 9(9), 206; https://doi.org/10.3390/buildings9090206
Received: 15 August 2019 / Revised: 31 August 2019 / Accepted: 3 September 2019 / Published: 19 September 2019
Currently, green roof fire risks are not clearly defined. This is because the problem is still not well understood, which raises concerns. The possibility of plants catching fire, especially during drought periods, is one of the reasons for necessary protection measures. The potential fire hazard for roof decks covered with vegetation has not yet been fully explored. The present study analyzes the performance of green roofs in extreme heat conditions by simulating a heat transfer process through the assembly. The main objective of this study was to determine the conditions and time required for the roof deck to reach a critical temperature. The effects of growing medium layer thickness (between 3 and 10 cm), porosity (0.5 to 0.7), and heating intensity (50, 100, 150, and 200 kW/m2) were examined. It was found that a green roof can protect a wooden roof deck from igniting with only 3 cm of soil coverage when exposed to severe heat fluxes for at least 25 minutes. The dependency of failure time on substrate thickness decreases with increasing heating load. It was also found that substrate porosity has a low impact on time to failure, and only at high heating loads. View Full-Text
Keywords: green roof; fire; heat transfer; modeling green roof; fire; heat transfer; modeling
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Gerzhova, N.; Blanchet, P.; Dagenais, C.; Côté, J.; Ménard, S. Heat Transfer Behavior of Green Roof Systems under Fire Condition: A Numerical Study. Buildings 2019, 9, 206.

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