AS 3999 is the standard for putting insulation in properly. It is not about which product you buy — it is about whether the batts and blankets are installed so they actually perform.
What AS 3999 actually means
AS 3999 sets out the installation requirements for bulk thermal insulation — the batts and blankets in your walls and ceiling. Its focus is quality of fit: insulation must be installed without gaps, without being compressed, and with the clearances required around heat sources and services. A perfectly good batt performs poorly if it is squashed, torn, or left out around a downlight or pipe.
Where it applies in your new home
Bulk insulation goes into external walls and the ceiling to meet the energy-efficiency provisions of the National Construction Code. AS 3999 governs how it is fitted so the thermal performance designed into your home is the performance you actually get once you are living in it.
What VG Inspect checks against it
Wall insulation is checked at the pre-plaster (lockup) inspection, while it is installed but still visible. An inspector looks for continuous coverage with no gaps, batts that sit in the cavity without being compressed, and insulation properly fitted around services rather than left out. Once plasterboard is on, none of this can be seen — so the timing of the inspection is what makes it useful.
What it does and doesn't cover
AS 3999 covers the installation of bulk insulation. The membranes that keep water out are covered by AS 4200; the energy-efficiency requirements that determine how much insulation you need come from the National Construction Code. AS 3999 is the link that makes sure the insulation is installed to deliver on those requirements.
A VG Inspect QBCC-licensed inspector (QBCC Licence 1318443) checks your insulation before the plasterboard goes on, and reports the same day. Call 07 3180 8041 or book an inspection online.