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Jimmy, Thats fantastic. Thank you. I hadn't dared ask how to calculate the overall U-value as it is so complicated but I can follow your maths! So for the thickness all I need to do now is to confirm the size of the beading either side of the panel and then I'm good to go. right now I'm...

Actually looking more at doors most external doors are 44mm thick and yet have double or triple glazing. Surely then this IS adequate for windows? Am i missing something? Thanks

Hi thanks for the comments! I've checked building regs approval and it is asking for 1.8 U value. I've also spoken to technical at Saint-Gobain and they have confirmed that Planitherm Total Plus with 90% argon fill on 4-10-4 will give 1.5 U value with total thickness of 18mm so thats adequate...

Hi all, I'm building windows for my new build and I am trying to find out what size timber I need. Its a new build house so needs to be build regs compliant so at this point thinking 18mm glaze panel with standard void not fancy argon or krypton. Build regs wouldn't express an opinion - just...