How “green” are the green roofs? Lifecycle analysis of green roof materials

Bianchini, Fabricio; Hewage, Kasun

doi:10.1016/j.buildenv.2011.08.019

Cited by 223 publications

(134 citation statements)

References 32 publications

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“…The drainage layer should be light and thin; thus, materials such as polyethylene and polypropylene are preferred when building green roofs due to weight limitations, flexibility to transport in rolls, easy installation, high strength, durability and a low production cost [23]. However, production of polymers has high environmental impact, with the release of the carbon dioxide of 2 kg per 1 kg of LDPE and 1.7 kg per 1 kg of PP.…”

Section: Introductionmentioning

confidence: 99%

“…However, production of polymers has high environmental impact, with the release of the carbon dioxide of 2 kg per 1 kg of LDPE and 1.7 kg per 1 kg of PP. It is also characterized by a considerably high amount of material and energy use [23]. It is essential to explore materials that can replace the current use of polymers to enhance overall sustainability of green roofs.…”

Section: Introductionmentioning

confidence: 99%

“…Looking for alternative materials for green roof construction focuses mostly on the materials with low environmental impact, e.g., recycled materials [2,5,23]. To date, little research has been done to optimize the drainage layer of a green roof to be effective in hydraulic properties as well as runoff quality.…”

Section: Introductionmentioning

confidence: 99%

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Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Karczmarczyk

Baryła

Bus

2014

Water

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Abstract:The main hypothesis of the presented study is that the negative effect of phosphorus leaching from a green roof substrate can be reduced by including P-reactive material in a drainage layer. In this work, different aggregates (Pollytag ® , lightweight expanded clay aggregates, chalcedony, serpentynite and crushed autoclaved aerated concrete) to be used as the green roof drainage layer are described. Physical parameters, e.g., granulometric composition, water absorption, bulk density and porosity are assessed. A phosphorus sorption isotherm and a kinetic test were performed. Physical and chemical characteristics of the materials were used as a base for choosing the best media for the drainage layer. The P-removal efficiency of crushed autoclaved aerated concrete was confirmed in a column experiment. Adding the implementation of the P-reactive material in a drainage layer during construction can reduce the negative effect of substrate on green roof runoff quality.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Karczmarczyk

Baryła

Bus

2014

Water

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“…For example, polypropylene and polystyrene are recycled and they are used in the back-cabinets of TVs, flow fans, balancers of washing machines, base frames, dewatering tanks and protection nets of air conditioners. Also, polypropylene products are recycled in fresh food cases of refrigerators and water tanks of washing machines [71][72][73][74][75].…”

Section: Recycled Polymers For Indoor Applicationsmentioning

confidence: 99%

Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

2017

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This study aims to provide an updated survey of the main thermoplastic polymers in order to obtain recyclable materials for various industrial and indoor applications. The synthesis approach significantly impacts the properties of such materials and these properties in turn have a significant impact on their applications. Due to the ideal properties of the thermoplastic polymers such as corrosion resistance, low density or user-friendly design, the production of plastics has increased markedly over the last 60 years, becoming more used than aluminum or other metals. Also, recycling is one of the most important actions currently available to reduce these impacts and represents one of the most dynamic areas in the plastics industry today.

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“…Despite the benefits inherent to the installation of green roofs, a study brought up the discussion of how "green" are the green roofs [22], as the popular techniques use non-recycled polymers, besides, the work presents an estimative of how long should the green roof installed with these materials be active to compensate it environmentally. Because of this, one must really be critical when presenting the benefits of a green roof, once that in it might have been used materials that collaborate in damaging the environment, thus bringing more harm to the planet than urban improvements.…”

Section: Introductionmentioning

confidence: 99%

Extensive Green Roofs (Modulars, Continuous and Aerial) Supported on Premolded Concrete Bases

Mendonça¹,

Henriques²,

Melo³

2015

IJET

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Abstract-This study proposes extensive green roofs, based on three typologies, that in function of the resulting configuration are identified as modular, continuous and aerial. They all use herbaceous vegetation with premolded structures of light concrete, fabricated with a type of residue from the shoemaking industry, the Ethylene Vinyl Acetate (EVA). The typologies were designed and simulated, in real scale, in a laboratory, using medicinal plants. The modular typology uses vegetated blocks and corresponds to the simplest technique regarding installation and maintenance; the continuous typology is the system with vegetation and soil over plaques, providing the best plant development; the aerial type consists in the combination of vegetated blocks in two narrow bands of slab, with a screen between them, allowing the development of climbing plants, being this system the less biodiverse. All systems cater to the maximum weight parameter for extensive green roofs, and cater to the finalities expected from a green roof, with the possibility of having even additional contributions regarding thermal comfort, due to the use of a light aggregate in the composition of the premolded structures.

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How “green” are the green roofs? Lifecycle analysis of green roof materials

Cited by 223 publications

References 32 publications

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

Extensive Green Roofs (Modulars, Continuous and Aerial) Supported on Premolded Concrete Bases

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