On 07/03/2019 08:27, Brian Gaff wrote:

with redesigned clip in outward facing strips, others say its false economy
, get new pvc ones due to the blocking of the cold in the frames now used.
However I'm not going to rush changing them!


Do you have a thermal break? A 4mm or so band around the edge of the
window - you'll probably be able to feel this as a depression on opening
windows.

4mm isn't the best thermal break, but when I did the calcs for mine,
it's not that far off modern standards.


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