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PIR INSULATION

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grifter

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8 Dec 2008
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I am fitting PIR insulation between ceiling joists. My question is should the face be flush with the joists so the plasterboard is touching it or do l need to leave a gap between the pir and plasterboard?
 
Tight and tape it all together for a vapour barrier. Assume you have an airgap between the top of PIR and felt?
 

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