In modelling a 240sqm low set dwelling in the Brisbane climate, I achieved 6 stars with an insulated slab-on-ground (R1.0). Modelling the exact same dwelling but with NO insulation, a 6.5 star rating was achieved. Isn't insulation to the slab beneficial?

 

Insulating the slab is most beneficial in a very cold climate and works against you in hot climates.

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