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Plastic failure inside thermal window

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I don't know if this is a problem or not. The interior perimeter of these thermal paned windows has a cracking plastic. None of the windows shows signs of a bad seal with fogging or moisture between the glass. Might this adversely affect the R-value? I will take any remarks. Thanks.


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cracking plastic, in and by itself, would not affect the performance of window.  I suspect it is just cosmetic.  Nearly all vinyl will eventually crack.  I wouldn't think the plastic does anything other than look good. 


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