Results Summary

The cumulative difference across the 4 categories assessed for Green Star compliance (Green Star Materials Life Cycle Impacts Innovation Challenge) shows a cumulative 111% reduction compared to the benchmark, achieving 4 points in the Life Cycle Assessment – LCA credit. A further 1 point is achieved for reporting on a further 5 impact indicators. Thus a full points is achieved for the credit.

Environmental Impact Indicator Unit Improvement over Reference %
Global Warming Potential kg CO2 e/m2 34
Abiotic Resource Depletion kg Sb e/m2 35
Eutrophication kg PO4 e/m2 29
Human Toxicity mDaly/m2 22
Acidification Potential kg SO2– e/m2 30
Photochemical Oxidant Creation Potential kg C2H4 e/m2 24
Land Use m2.yr.arable/m2 28
Fresh Water m3 deprived/m2 7
Ozone Layer Depletion mg CFC11e/m2 12

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

Operational Energy – The operational energy figures for the base building have been derived from energy modeling completed based on the project’s Green Star Ene 1 submission. The scope of these energy calculations aligns well with the EN15978 scope.

Life Span of Building

For the purposes of this study, a default service life of the building of 60 years has been applied in accordance with the Green Star Innovation Challenge criteria.

Building Maintenance and Operation

The frequency of materials used for replacement or repair is calculated via the product life spans for various building elements. The frequency of trade staff requirements and maintenance equipment requirements is intrinsically linked to the building component that is being repaired or replaced. For maintenance tasks not related to materials repair or replacement (for example window cleaning which requires no materials added to the building) the frequency is researched, applied to the model and verified.

This assessment was conducted by Umow Lai and certified by Pat Hermon from eTool in November 2015.