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Never knew pvcU or Upvc (or what ever they are know as) had a thermal break, thought the plastic was enough to thermally insulate from the outside to the inside. Older aluminium replacement double glazed windows and doors didn't have the break and used to have the condensation running down the inside of the frame. It is also a good way of dating the installation.
lynx
rhowe
@lynx some modern pvc and metal windows have thermal break but generally doors and windows do not have thermal breaks why are you asking?