Does anyone have any informed opinions on
90mm PIR board between studs with 25mm PIR over the studs, covered by plasterboard
Vs
40mm breathable superfoil battened between studs, with 40mm superfoil over studs, 25mm battens and plasterboard
https://www.roofingsuperstore.co.uk/product/superfoil-sf19bb-breathable-thermal-insulation-15m-x-10m-roll-15m2.html
https://www.roofingsuperstore.co.uk/product/superfoil-sf19-multi-layer-thermal-insulation-15m-x-10m-roll-15m2.html
Depends on where you're putting it, I'd have thought.
Then it's all about u-values, ventilation / vapour barriers, and how much space you're prepared to give up.
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Does anyone have any informed opinions on
90mm PIR board between studs with 25mm PIR over the studs, covered by plasterboard
Vs
40mm breathable superfoil battened between studs, with 40mm superfoil over studs, 25mm battens and plasterboard
https://www.roofingsuperstore.co.uk/product/superfoil-sf19bb-breathable-thermal-insulation-15m-x-10m-roll-15m2.html
https://www.roofingsuperstore.co.uk/product/superfoil-sf19-multi-layer-thermal-insulation-15m-x-10m-roll-15m2.html