would this defeat the whole point of wall insulation?

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Am installing 37mm insulated PIR board via dot and dab.

Around door and window reveals, i was going to use standard 12.5mm plasterboard instead of 37.5mm board- would this defeat the whole point of insulating the wall, or would it be ok?
 
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SFK

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Some insulation better than none otherwise you will get water condensing there.
If thickness is issue, cut pir board thinner (say 10mm) for window reviews.
Sfk
 
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