I have never heard of anyone wanting to insulate the walls with neighbours - it is fairly pointless.
Assuming they keep their house as warm as you do, you lose no heat through that wall. If they keep it warmer, you lose out.
ask kingspan to stand over their recommendation with a hygrothermal simulation to IS EN 15026-2007, particularly the risk to your existing structure and families health from interstitial condensation/ dew-point forming behind the insulation. they'll tell you they dont provide that data, and you'll be forced to ask yourself what good are the kingspan technical department?Rang KingSpan technical dept:
They said
Walls facing street - K18 82MM
Walls facing neighbours - K18 52MM
Floor - TF 70 25MM
Attic - K7 70MM Between Joists and 70MM Over Joists
Wonder if anyone has comments
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