Thanks for that. The Sunguard site has a lot of relevant information including comments about frames being in direct contact with concrete walls contributing to conditions favourable for thermal…

Apology accepted but I did in fact join more than a year ago but have been waitiing on building approval for an extended period so have not posted until recently.…

Mark,
As an industry person are you able to contribute to my queries about thermal cracking and argon gas loss in another thread in this forum??
http://forum.homeone.com.au/viewtopic.php?f=23&t=23583

I have since found this link which lists some of the factors. Not an Australian supplier but it does looks like heat treatment is definitely the way to avoid…

Ed
I am just an owner builder hoping for a technical contribution rather than a one liner so rightly or wrongly I have interpreted your comment as not a…

Maybe as end users we should all appreciate that a wider range of high performance windows are available. (You can even buy double glazed windows from Bunnings now but you…

Some one posted a link to this supplier elsewhere on this site. I think they may have something that will work for you.
http://www.cavitysliders.com.au/our-products/ProductDetails.asp?ProductID=71
Stephen

I am currently going through the process of finalising an order for double glazed thermal break windows for a new owner build. We are looking to take advantage of…