Technical Clarification
Gunite and Gunite Mesh 

Technical Clarification Number


Project teams whose projects include Gunite and Gunite Mesh are not to include these materials in the MAT-05 and MAT-06 calculations as the the GBCSA confirm this is not considered structural concrete for the purposes of this credit. Gunite Mesh is generally made from >60% recycled content, however should Gunite Mesh be included in the project, the project team is to confirm the mesh is > 60% recycled content to ensure its exclusion in the calculations. 


Technical Clarification

Gabions as a non-concrete application

Technical Clarification Number


For the additional 3rd point of credit Mat-5 as it relates to “non-concrete applications (e.g. stone sub-soil drains, road layerworks and backfill, etc.)”,​ the GBCSA confirm that gabions can be excluded as they are deemed to not be aggregates for the purposes of this credit.



Technical Clarification

Definition of non-structural in-situ concrete

Erratum Number


Under MAT 5, to achieve the additional 3rd point:

 1) 10% of all aggregate used for structural (concrete) purposes is to be recycled aggregate (equivalent to Class 1 RCA as per Australian standard HB155-2002) or slag aggregate; AND

2) No virgin aggregates are used in non-structural in-situ concrete applications (e.g. (concrete) footpaths, (concrete) curbs, (concrete) backfilling to service tranches, etc.) and non-concrete applications (e.g. stone sub-soil drains, road layerworks and backfill, etc.)

 The definition of non-structural in-situ concrete is, according to GBCSA, ‘not forming part of any load bearing or engineered element that is poured on site’. And similarly the definition of structural concrete, according to the GBCSA, is ‘forming part of any load bearing or engineered element’. A structural engineer can determine on a project how this definition applies to specific applications.


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