You'll have to wait until all the plumbing and electrical wiring is complete; then fiberglass batting will be fitted on the walls. The quality of the soundproofing will depend on the thickness of the insulation used for your needs. You can choose underfloor insulation NZ, which is simply rolled into place or you can opt for loose fill insulation, which is poured or blown into the attic. Batt insulation usually comes with an attached vapor barrier which prevents moisture build up in the attic. Its relatively easy to install and you can work your way around any fans or vents without having to use baffles.
The pink batts insulation Auckland is indeed a smart investment for homeowners who want to save money on heating and cooling their home. Just make sure you hire the services of a reputable company to do the installation for you and choose a material that has the highest R-rating for the best possible results. But if your attic does have ductwork in it, then look at the staple-up method. View it this way - putting ductwork in your attic is similar to using the oven for making ice cream.

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