What is the laid weight of IKO slates? Each IKOslate is 425 x 286mm and weighs 0.57kg Can I fit IKO enertherm ALU PIR insulation board 2400 x 1200 x 25mm onto my garage ceiling which is underneath a very cold bedroom? I will be fixing it onto existing plasterboard. What U Value does 150mm IKO enertherm ALU PIR board achieve for warm roof insulation between rafters?
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