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    • CommentAuthordelprado
    • CommentTimeAug 21st 2017
     
    Does anyone know how much of an issue this is, and if it is, whether toughened in the middle pane is the solution to the problem?

    https://www.bre.co.uk/page.jsp?id=3112

    Thanks
    •  
      CommentAuthordjh
    • CommentTimeAug 21st 2017
     
    I think if it were a serious problem there would be more reports of it in the press and suchlike. The BRE article is self-contradictory:

    "The warmer part of the pane expands while the cooler area does not. This restrains the expansion of the warmer area which is therefore subjected to tensile stresses. If the difference in temperature between the two areas is sufficiently large, a fracture in the glass will occur.

    Thermal fracture is characterised by a crack that starts at the edge of a glass pane, initially perpendicular to the edge and face of the pane."

    The cooler parts are of course subject to tensile stresses, not the warmer parts. That's why the cooler parts crack!

    And finally, that's what insurance-backed warranties are for. Make sure your supplier and installer have them.
    • CommentAuthorgravelld
    • CommentTimeAug 21st 2017
     
    Funny, saw this mentioned just the other day, can't remember where. Presumed it was Daily Mail FUD.
    • CommentAuthortony
    • CommentTimeAug 21st 2017
     
    looks like damaged to me, hardly surprising that it cracked

    I have see high level toughened shatter due to thermal movement making them press on a screw or bolt used to fix glazing system together
    •  
      CommentAuthorDamonHD
    • CommentTimeAug 21st 2017
     
    I have had two adjacent 3G windows shatter on a cold night...

    Rgds

    Damon
    •  
      CommentAuthordjh
    • CommentTimeAug 21st 2017
     
    Posted By: DamonHDI have had two adjacent 3G windows shatter on a cold night...

    What type of glass and which pane/layer?
    • CommentAuthorCWatters
    • CommentTimeAug 22nd 2017
     
    The article concludes by saying that edge damage can make the problem worse and damaged units should be rejected.
    •  
      CommentAuthorDamonHD
    • CommentTimeAug 22nd 2017
     
    @djh

    See: http://www.earth.org.uk/triple-glazing-3G.html entry for 2013/11/11.

    Rgds

    Damon
    •  
      CommentAuthordjh
    • CommentTimeAug 22nd 2017
     
    Thanks Damon, so the panes that cracked were ordinary 4 mm float glass, on the outside. I can't see anything special about them being in triple glazing. The outermost pane of any glazing is always cold and in triple glazing it will be more uniformly cold (i.e. less temperature difference across it) so should be subject to less stress as a result, rather than more. Being cold might also reduce any stress at the edges due to pressure, although that depends on how much the frame around it shrinks when cold and is presumably taken into account in the design in any case. So I can't think of any particular reason why a pane would crack, let alone two. I presume the replacements have been fine. Do you have any thoughts about what caused them to crack?
    •  
      CommentAuthorDamonHD
    • CommentTimeAug 22nd 2017
     
    The replacements have been fine.

    I had assumed that the fairly cold night relatively soon after installation may have set them off. I should think that we have had colder nights since with no visible effects on those windows or any of our others.

    Dunno.

    Rgds

    Damon
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