The vapour barrier Hydro P 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 of adhesive tape sheets should be made very carefully with at least 10 cm overlap, preventing loss of the vapour barrier integrity.
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