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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Insulating 300m2 wall area?

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      CommentAuthorfostertom
    • CommentTimeOct 13th 2023 edited
     
    May be due to the share of conduction/convection vs radiation within the composite so-called 'conductivity' U-value or 2G vs 3G. If 3G makes a disproportionate reduction in radiation, then yes it would feel more comfortable to be near. What people think is 'draughts' is largely radiation.
    • CommentAuthorborpin
    • CommentTimeOct 17th 2023
     
    It was over 25 years ago the 2G was installed in my first house. My 3G have been in this one for 11 years now.
    • CommentAuthorRobL
    • CommentTimeOct 17th 2023
     
    Pilkington K glass has been around for 30 years, so 25yr old DG *might* have been made with it. But likely not. You can check on a cold day, using an IR temperature sensor to make a few measurements and calculate the U value. It’s likely to be 2.7 (two sheets of glass) or 1.5 ish(pilk K and a normal sheet) at an air gap of 14mm or so.
    • CommentAuthorMike1
    • CommentTimeOct 18th 2023 edited
     
    Posted By: cjardThe U value spread for glazing is roughly 5, 1.5, 0.8 for single / double / triple; triple is an improvement but not as much as it was
    For the glazing only (excluding the frame) the U-value of double glazing can be significantly better than 1.5.

    For example those for the current project come in at 1.1, with the Saint-Gobain spec: 22.1 (14 Argon 90) 42.1 ECLAZ F3. Going to triple glazing wouldn't have made a big difference by itself; for that I'd have had to upgrade the frames to PassivHaus standard. I'd like to have done that, but the profiles are non-standard and the upgrade couldn't be justified financially.
    • CommentAuthorMike1
    • CommentTimeOct 18th 2023 edited
     
    ...duplicate deleted...

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