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Hi all,
I agree with Lois- the only house (apart from a poll house) that does not require a ground vapour barrier is the one that already got it. 🙂
However, Rotorua presents some additional challenges due to a higher vapour content in the porous pumice soil. I can only guess that geothermal activity in the ground may cause some immense vapour transport into houses above. My idea of a custom designed floor system for such areas would have a totally impermeable membrane (preferably rigid) to the bottom of floor joists. Subsequently, the subfloor area would have to be exposed to provide as much ventilation to it as possible.