Project Description

High-Performance
Green Roof

Daramu House

Gadigal land

Key Facts

Year Completed:
2019
Garden Type:
Biodiversity Green Roof with solar array
Size of Garden:
1800m2
Number of Plants:
10,000
Number of Species:
12
Types of Species:
Viola hereracea, Dichondra repens, Crassula multicava, Aptenia coridfolia, Dianella caerulea, Myoporum parvifolium, Brachyscome multifida, Gazania tomentosa, Goodenia ovata, Poa poiformis, Themeda australis, Carpobrotus glaucescens
Architect:
Tzannes
Ratings:
6 Star Green Star – Design & As Built

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Daramu House is a stunning example of excellence in sustainability and innovation. This multi-award winning project is constructed with cross laminated timber and includes a photovoltaic solar array and Junglefy biodiversity roof.

Located adjacent to the near-identical International Tower, provided the unique opportunity for Lendlease to investigate whether a green roof could enhance the energy efficiency of solar panels. Funded by the City of Sydney’s Innovation Grant, the collaborative research project with Lendlease, the University of Technology Sydney and Junglefy was developed to validate this query and prove the positive impact of a green roof on urban heat, biodiversity, storm water mitigation and carbon dioxide reduction.

International Tower was fitted with photovoltaic solar panels and Daramu House included the same solar array with the addition of the green roof. The green roof paired with the solar panels worked symbiotically – the plants cool the surrounding area, allowing the solar panels to function at their optimum efficiency and the solar panels provide shade for the plants to proliferate. The inclusion of the biodiversity habitat is an industry-first innovation, creating a habitat and food source for pollinators where previously, they would not exist is this urban environment.

The reseach findings from Daramu House with the integrated solar-green roof showed:

  • 3.6% increase in solar panel efficiency
  • Up to 20 degrees cooler in Summer
  • Insect and bird life dramatically increased with evidence of a complex food web system (trophic pyramid)
  • 8.8 tonnes of CO2 equivalent greenhouse gases removed
  • 600L/second of stormwater absorbed and diverted from waterways

The outstanding results of the integrated green roof solar PV system confirm that living infrastructure is perhaps one the easiest and most efficient initiatives that can provide multiple benefits and help make our cities more resilient to our changing climate.  

Our role

Junglefy constructed the green roof base layer with irrigation, drainage cells and the proprietry Junglefy roof top soil mix, developed specifically to be lightweight and to drain well. Our team of horticulturalists, planted thousands of plants on the roof top and carefully built the pollinator mounds with rammed clay. Logs and branches were sourced and drilled with holes to create nests for pollinators. The plants used are a carefully selected variety that provide an all-year food source for pollinators.

Junglefy’s Research and Development team consulted with the research group on this project to assist with developing these important findings. Junglefy’s maintenance horticulturalists visit Daramu House regularly, to carry out maintenance where required, check irrigation and systems, and inspect the nests for evidence of pollinator activity.

Key Innovation

Junglefy’s pioneering Biodiversity Roof was developed and researched as a response to urban biodiversity loss and the decline in pollinating insects across our cities. Junglefy conducted extensive in-house research to develop a deep understanding of the plants, conditions and behaviour of pollinators in order to provide the ideal habitat conditions.

We tested various soil and materials to develop the perfect composition for durable mounds that provide the optimum nesting opportunity for native bees who don’t create hives but nest in shallow ground burrows. To complement the mounds, reclaimed logs of various timbers were drilled with holes to simulate old logs and trees where these insects can also nest. The habitat are distributed throughout the plants and have been drilled wi to ensure the nests are close to abundant food.

*Images courtesy of Lendlease, University of Technology Sydney & Junglefy