During the week the Department of Climate Change and Energy Efficiency issued two bulletins, both of which have relevance for Accredited Thermal Performance Assessors like ourselves.

Bulletin One – Nathers technical note

This has been prepared to assist NatHERS assessors who conduct energy rating assessments of houses.
These principles will supersede any document that you may be using.
Any current or future practice notes for assessors will need to be in line with this document.
It is expected that the principles will be the guiding document for assessors from the time they are circulated.
The principles are not meant to cover every modelling situation, but to provide consistency around fundamental issues such as zoning.
Assessors will still need to rely on their professional judgement in many situations.
The principles are not a practice guide or software specific guide.

Note: This document is being circulated for a three month trial period (October to end of December 2012).

Any feedback or comments must be provided via your Assessor Accrediting Organisation

See the full technical note here.


Bulletin Two – Technical Note on downlights

The clearance required around downlights by “Australian Standard AS/NZS 3000 – 2007 Electrical Installations” (AS/NZS 3000), introduces a significant area of uninsulated ceiling and therefore increases heat loss and gain through the ceiling. This can be allowed for by reducing the R value of ceiling insulation.

This note provides NatHERS assessors with techniques to reduce the ceiling R value to allow for the gaps that the clearance around downlights and other ceiling penetrations including flues, exhaust fans, electrical resistance heaters. This note also offers alternative solutions for assessor’s to calculate the loss of ceiling insulation on a zone by zone basis. Note that downlights can also provide a significant source of air leakage.

See the full technical note here.


Technical note one is a great step forward for energy raters, particularly in Tasmania currently where energy rating services could be completed by untrained and in alot of cases unqualified people.

In my eyes this will bring alot of consistency to the area of energy rating and will give the governing bodys power to enforce good quality ratings through their CPD and assessment processes on members.

I would suggest that after the 3 month trial this will become full legalisation, but no promises here!


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