Comparison between cork-based and conventional green roof solutions

Simões, N.; Almeida, Ricardo; Tadeu, A.; Brett, Michael; Almeida, João

doi:10.1016/j.buildenv.2020.106812

Cited by 16 publications

(5 citation statements)

References 58 publications

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“…These temperature data were used to validate the modeling output (specifically the temperature distribution) at different depths in the green roof. Considering that the indicators for thermal resistance have been attributed to the temperature distribution through the materials' depth [11,[52][53][54] , the temperature values were assessed by changing the drainage and substrate layers' depth to introduce the green roof layers' optimum thickness.…”

Section: Methodsmentioning

confidence: 99%

“…Thereafter, the green roof layers' thermal properties were utilized for the simulation of green roof systems and the modeling data were validated with experimental data. After that, since the indicators for the thermal resistance assessment are related to the temperature value of materials [11,[52][53][54], a sensitivity analysis on the influence of the drainage and substrate layers' thickness on the temperature distribution was performed. This parametric study allowed for the determination of the optimum thickness of both drainage and substrate layers to optimize the green roof systems' thermal performance.…”

Section: Introductionmentioning

confidence: 99%

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Coarse recycled materials for the drainage and substrate layers of green roof system in dry condition: Parametric study and thermal heat transfer

Kazemi

Courard

Hubert

2022

Journal of Building Engineering

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coarse recycled materials for the drainage and substrate layers of green roof system in dry condition: Parametric study and thermal heat transfer

Kazemi

Courard

Hubert

2022

Journal of Building Engineering

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“…The substrate is also important for water drainage and retention capacity [16] and provides additional thermal inertia to the roof [17,18]. Previous studies have shown that the thermal conductivity of substrates varies between 0.10 and 0.25 W/(m• • C) and 0.30 and 0.60 W/(m• • C) for dried and saturated states, respectively [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterisation of Different Ecological Substrates for Use in Green Roof Systems

Coelho¹,

Almeida

Castro

et al. 2022

Sustainability

Self Cite

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Green roofs are made up of several components, including those belonging to the waterproofing and drainage layers, substrate, and vegetation. Of these, the substrate is undoubtedly one of the most important layers of a green roof, contributing not only to the healthy growth of vegetation but also to the water retention capacity and thermal behaviour of the whole solution. Although green roofs are widely recognized as sustainable solutions, it is possible to further improve their environmental performance by developing more ecological substrates that contain industrial by-products. Bearing this objective in mind, sixteen newly developed substrates were characterized in terms of thermal conductivity, specific heat, emissivity, water vapour transmission, hygroscopic sorption, and water retention/drainage capacity. These properties are extremely relevant when solving heat and mass transfer problems as well as for water management prediction. Two reference substrates were also studied for comparison purposes. The results showed that the new ecological substrates have properties that make them comparable to conventional substrates already available on the market. Additionally, the results showed that temperature, moisture content, and density play an important role in the behaviour of substrates of this kind and have a significant influence on many of the studied properties.

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“…Later on, the hygrothermal conditions of unsaturated substrate and drainage layers were translated into the WUFI software and the modelling outputs were compared with green roof specimens' results. Considering the fact that the thermal insulation performance was related to the temperature distribution through the depth of materials [19,44,45,57], the temperature variation within green roof layers was evaluated, where the substrate and drainage layers' thickness was changed to achieve an optimum design of green roof systems with an adequate thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Modelling hygrothermal conditions of unsaturated substrate and drainage layers for the thermal resistance assessment of green roof: Effect of coarse recycled materials

Kazemi

Courard

2021

Energy and Buildings

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Alternative materials exist for green roof layers: secondary resources like coarse or fine recycled aggregates may be used as a substitute to natural materials. For using these new types of materials, it is needed to assess their heat resistance which is performed according to ISO 9869-1 standard. Moreover, the initial hygrothermal conditions of unsaturated substrate and drainage layers have also to be modelled and assessed for optimizing the layers' thickness. In this study, the green roofs with unsaturated substrate and drainage layers incorporating coarse recycled materials were tested and assessed. The hygrothermal conditions of unsaturated substrate and drainage layers were simulated using WUFI software. A small difference (4.2%) was observed between the Rc-value of the green roofs with and without coarse recycled materials, confirming that these materials provided a sufficient thermal resistance, similar to soil particles for the substrate layer. Considering a constant thickness for the substrate layer (15 cm), a 6-cm drainage layer with coarse aggregates was considered as the optimum design for green roof systems. Besides, 18-cm unsaturated substrate layer was the optimum design when the drainage layer' thickness was considered constant (5 cm). The 6-cm drainage layer and 18-cm unsaturated substrate layer were definitely the best design for the roofing systems with the simultaneous change in the substrate and drainage layers' thickness.

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Comparison between cork-based and conventional green roof solutions

Cited by 16 publications

References 58 publications

Coarse recycled materials for the drainage and substrate layers of green roof system in dry condition: Parametric study and thermal heat transfer

Coarse recycled materials for the drainage and substrate layers of green roof system in dry condition: Parametric study and thermal heat transfer

Experimental Characterisation of Different Ecological Substrates for Use in Green Roof Systems

Modelling hygrothermal conditions of unsaturated substrate and drainage layers for the thermal resistance assessment of green roof: Effect of coarse recycled materials

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