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NotThamesWater
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