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A Parametric Study of Fire Risks of Green Roofs to Adjacent Buildings

Gerzhova Nataliia, Dagenais Christian, Ménard Sylvain, Blanchet Pierre et Côté Jean. (2022). A Parametric Study of Fire Risks of Green Roofs to Adjacent Buildings. Fire, 5, (4), e93.

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The susceptibility of plants to burn raises concerns about fire hazard that green roofs may pose to buildings. Main concerns relate to cases when such roofs are poorly maintained or stressed by drought conditions which leads to drying out of plants and the accumulation of dead organic material, greatly increasing the availability of fuel load. Existing standard safety measures aim to prevent the spread of fire through the vegetation cover. However, fire spread by thermal radiation is not considered. In this study, fire risk of exposure of adjacent buildings to radiant heat flux produced by fire on green roofs was assessed. Based on generally accepted maximum tolerable radiant heat flux to exposed facades of 12.5 kW/m2, the minimum safe separation distances were obtained for different conditions. Wildland fire behavior model was used to determine flame lengths which is the necessary parameter for a radiation model. Several vegetation types, moisture content scenarios and wind speeds were taken as variables. It was found that by providing the vegetation with reasonably high moisture content the fire risk can be greatly reduced, especially for grass-covered roofs. Since wind also has a strong effect on flame size, considering the exposure of a green roof to wind can bring better understanding of fire risk to adjacent buildings. At no-wind condition and at extremely low moisture content separation distances are as short as 3.1 m for dense shrubs and 2.4 m for tall dense grass.

Type de document:Article publié dans une revue avec comité d'évaluation
Version évaluée par les pairs:Oui
Identifiant unique:10.3390/fire5040093
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:green roof, fire risk, radiation heat transfer, separation distance, toit vert, risque d'incendie, transfert de chaleur par rayonnement, distance de séparation
Déposé le:02 août 2022 14:51
Dernière modification:02 août 2022 14:51
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