The vapour barrier Greenpar film is installed as one layer on the inside of the roof structure, running vertically or horizontally along the rafters. The film should be installed slightly tensioned. The vapour barrier should be connected with overlap using adhesive tape, and joined to rafters with two-sided adhesive tape. All connections between sheets of vapour barrier film should be constructed very carefully, with at least 10-cm overlap to maintain the vapour barrier integrity.
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