Are your windows really as energy efficient as you think?

The system designer, Architectural Window Systems (AWS) has had lengthy discussions with the Australian Window Association (AWA) and Australian Fenestration Rating Council (AFRC) regarding concerns about the thermal performance of inline reveal windows.

An inline reveal window can be described as a window or door product where a reveal is positioned in a way which covers a portion of the perimeter frame versus the reveal being fixed to the outer nailing-fin as used by AWS. Depending on local industry convention this may be referred to as an inline reveal, jam extender, jamb liner or timber lining.

Investigations into the thermal performance of inline reveal products conducted by AWS in 2012 uncovered significant variation between the simulated thermal performance values and physical hot box test results for these systems. This information was shared with the AWA along with concerns regarding the ongoing marketing and promotion of these products as “energy efficient”.

AWS chose to engage directly with the National Fenestration Rating Council (NFRC) to better understand this issue and seek clarity. At considerable expense, AWS undertook further testing of inline reveal windows at an NFRC accredited laboratory in Fresno USA, alongside NFRC representatives.

 AWS now holds the largest body of independent research into the performance of this window variant with in excess of 50 individual tests completed across a range of Australian brands. The inconsistency and variation in test results supports our earlier concerns, AWS can clearly demonstrate that this is a real non-conformance issue which should be addressed by the AWA and AFRC.

Non-conforming building products have again hit headlines and the importance of product compliance is being emphasised by industry and government alike. The AWA recently published the following definition of Non-conforming products in its’ Windows Magazine:

“Non-conforming building products are products or materials that claim to be something they are not; do not meet required standards for their intended use; or are marked and supplied with the intent to deceive those who use them.”

Inline Reveals2

"Non-conforming building products are products or materials that claim to be something they are not; do not meet required standards for their intended use; or are marked and supplied with the intent to deceive those who use them."

We believe high performance, thermally efficient windows and doors have an important role to play in a sustainable future.

It is important that consumers are properly equipped to question the performance of the products they choose which is why AWS have prepared an information sheet on this topic:

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Architectural Windows & Doors

WindowsDoors Admin


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