Project general details
WORLD GREEN INFRASTRUCTURE AWARD
Boronggook Drysdale Library - Sloping Green Roof
Nominator
Investor
Supplier
Architect
Fytogreen Australia
Nicholson Construction Pty Ltd
Antarctica Architects
Fytogreen Australia
Location (City)
GPS
Country
Region
Year of nomination
Drysdale
data
Australia
Oceania
2024
Project specifications
The Boronggook Drysdale Library was opened in May 2023 and features a unique circular design, planted with sloping green roofs. The roof garden is the first of its kind in the Greater Geelong region, and covers an area of 544 square metres. With a 45 degree outward slope that forms a funnel, Fytogreen used a Geoweb cellular confinement system to support the soil and plants. Home to more than 4,770 plants from 18 different native species, the green roof creates a natural habitat for birds, bees, and butterflies. The roof garden also extends to the facade of the library, facing the public parkland. The green roof contributes to the library’s environmental sustainability performance credentials, which also include resource-efficient systems that utilises the site collection of storm water for irrigation in a large underground tank, and a planting palette that is regenerative and self-sustaining providing enhanced biodiverse habitat. It was developed in collaboration with the City of Great
Object type
Roof accessibility
Roof slope
Year of completion
Project in operation?
Administrative and civil construction buildings
Private
20-45 degree
2022
YES
Green roof area (m2)
544
Green roof specification
Method of establishment of vegetation
Tubestock planted
Vegetation
17 species. 4,770 plants derived from native indigenous selections utilising the local Landcare Nursery supplemented where required as tubestock size.
Vegetation layer
Hydrocell 40 media - 150mm on the 45 deg slopes and 140mm on the 3 deg top section, installed via crane and bulka bags. Mulch layer on the top section is 20mm deep of 14mm natural black scoria. Fertiliser is Osmocote Low P 12-14 month
Retention layer
Geoweb 150mm on 45 degree slope sections - suspended off an engineered rail set mid height of the profile. Engineering by Presto and Geofabrics Australia.
Filtration layer
Bidim A24 Geofabric - 2mm thickness
Drainage layer
Atlantis Flo-Cell 20 Drainage Cell - 20mm thickness
Separate layer
N/A
Protective layer
LDPE plastic protection layer above the waterproof roof - thickness 0.02mm
Root layer
Twin Sheet torch on Membrane with ILD leak detection system
Category:
GREEN ROOFS
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