Luca

Hi there, https://www.insulationsuperstore.co.uk/product/celotex-xr4150-zero-odp-rigid-insulation-board-150mm-x-1200mm-x-2400mm.html 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? https://www.beatsons.co.uk/building-supplies-c2514/builders-metalwork-c2632/polythene-c2640/beatsons-green-vapour-barrier-125mu-4x50m-p27247 Many thanks!