Results Summary

The difference across the 6 categories assessed for Green Star compliance shows a cumulative 252% reduction compared to the benchmark, achieving 6 points in the Life Cycle Assessment – LCA credit. A further 1 point is achieved for reporting on 5 additional impact indicators. Thus full 7 points have been achieved for the Green Star Life Cycle Impacts credit.

Environmental Impact Indicator Unit Improvement over Reference %
Global Warming Potential kg CO2 e/m2 56.8
Abiotic Resource Depletion kg Sb e/m2 59.2
Eutrophication kg PO4 e/m2 46.5
Human Toxicity mDaly/m2 31.4
Acidification Potential kg SO2– e/m2 51.7
Photochemical Ozone Creation Potential kg C2H4 e/m2 24.1
Land Use m2.yr.arable/m2 3.8
Water Footprint m3 deprived/m2 41.4
Ozone Layer Depletion mg CFC11e/m2 13.4

Project features

It is observed through the LCA modeling that the following areas have the greatest impact to the overall environmental footprint of the building:

Operational Energy

The operational energy use for the building was the focus of the design since conception. The high performance façade consisted of well insulated assemblies and low-e double glazed units with integral shading provided by balcony elements and green walls. Air conditioning is provided by energy efficient heat recovery Variable Refrigerant Flow (VRF) fan coil units distributed throughout office space. The absorbed fan power of the units is reduced by selection at lowest fan speed setting via ductwork design for reduced airflow resistance. The ventilation system is demand controlled with CO2 sensors located in all office zones. A solar thermal hot water preheat system with an efficient gas heated storage tank was installed. An LED lighting system was used to achieve a lighting power density less than 6W/m2 . The lighting is also being automatically controlled with occupancy and daylight sensors located throughout the building. A 15kW roof-mounted solar photovoltaic system has been estimated to produce 28% of the total operational electricity used by the building.

Water

Water savings were achieved by careful selection of water efficient fixtures, each with a high WERS rating. Rainwater is being collected from the roof and harvested in a storage tank for use in toilets and urinals. The building is on a zero lot line as such there is limited room for landscaping. There are two green walls that have been installed with selected plantings that do not require irrigation and are drought resistant. Additionally, non-potable water hose bibs have been provided to the building exterior.

Materials

The ESD consultant worked closely with the contractor to ensure that the materials selected were optimized for our ESD targets. All of the materials selected were higher in recycled content than typical construction materials. The insulation selected had over 70% recycled content and the decking system contained 50% FSC wood combined with 50% recycled content. The steel reinforcement used throughout the building had over 70% recycled content. The concrete mixes used ensured maximum amount of fly ash, over 40% recycled content was used across all mixes. During the material selection process wherever possible local materials were selected over imported ones.

This assessment was conducted by Loreta Brazukas, Floth.

Certified by Pat Hermon.

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