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Celotex XR4150 for warm roofs and bonding of VCP polythene


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Hi there, 



mentions this type of celotex for cold roof - is it suitable as a warm roof insulation layer as well. Where should the foil side be and what fixing should be used.


Also, if using a polythene sheet like this as Vapor control barrier, how should it be bonded to the OSB - are nails ok?




Many thanks!

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