Articles in this issue

Welcome

Welcome to the seventh edition of the NatHERS Star!

This year's achievements

It has been another busy year for the NatHERS Administrator.

NatHERS Stats

Recent data on the NatHERS Certificate.

Fraudulant NatHERS Certificates

Recently the NatHERS Administrator has received, and been following up on, a number of NatHERS Certificates that have been suspected to be fraudulent.

NatHERS Assessor Handbook

The production of the NatHERS Assessor Handbook is well underway.

NatHERS at Sustainable House Day

Sustainable House Day was held on Sunday 16th September 2018.

Modelling obscure glass

It has been brought to the attention of the NatHERS Administrator that there is industry confusion as to how to correctly model obscured glass in NatHERS accredited software tools.

Update on Windows

The NatHERS Administrator continues to actively work on improvements to address concerns regarding windows.

Chenath updates for 2019

The Australian Building Codes Board (ABCB) have approved the following updates for the Chenath engine in line with the 2019 update to the NCC.

Trajectory for low energy homes

Australian governments are advancing the energy performance of residential and commercial buildings through the development of a Trajectory for Low Energy Buildings.

When to contact Who?

A quick guide on where to direct enquiries.

NatHERS myth buster: thermal mass

An insight into the thermal mass formulas used by the NatHERS calculation engine. 

IN OTHER NEWS

  • Your Home
  • BDAV 2018 Design Awards

Modelling obscure glass

It has been brought to the attention of the NatHERS Administrator that there is industry confusion as to how to correctly model obscured glass in NatHERS accredited software tools.

Obscured glass (frosted, fritted, film) is classified as a complex glazing system, which is not yet approved internationally through the National Fenestration Rating Council (NFRC). Therefore, the Australian Fenestration Rating Council (AFRC) are not currently capable of obtaining WERS ratings for these types of products. The custom windows library is managed and provided to NatHERS software tools by the AFRC and is based on WERS ratings.

Given obscured glass products are not in the current Custom Windows library (because they have no WERS rating), the NatHERS Administrator is currently reviewing and updating the NatHERS Technical Note to provide a clear direction for what assessors should do when obscure glass is specified. If using default windows, the best fit window currently available is to select the appropriate default ‘clear’ window option.

It is anticipated that complex glazing systems may be approved internationally through the NFRC and subsequently the AFRC in mid-2019, allowing products like this to be better incorporated into the NatHERS software tools and energy assessment.

Additionally, there is a NatHERS fact sheet available on our website explaining how windows impact on a home’s energy performance and the different types of windows that can be used in NatHERS assessments.