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Hello, Marek, According to Building Regulations the vapour barrier should be provided on the warm side of the insulation, as possible close to the interior. If there is used a counter battens below the rafters, the vapour barrier is installed to the underside of the rafters and covered with the additional insulation layer installed between the counter battens. This additional insulation layer (usually 50-70mm) so called „installation layer“ protects the vapour barrier against damage and creates a useful service void for running cables behind the plasterboard. This video demonstrates another kind of the roof structure where the additional insulation layer below the rafters is installed using the metal framing in a form of metal brackets and Rigips channels. In this structure there is impossible to install the vapour barrier to the underside of the rafters without damaging the vapour barrier, because of metal brackets. In this case the vapour barrier is taped on the channels, before the plasterboards. The useful service void for running cables there should be installed using the additional shorter brackets - please contact us by email Laima.Biezumaite@saint-gobain.com for more information.