During recent years, prefabricated, lightweight, wood-based membrane-roof components have been increasingly used in Denmark. It has become common practive to building these roofs without ventilation of the cavity between the insulation and the deck. Six types of roof cassettes have teen tested in the field for their moisture profermance. The roof have different designs and insulation thicknesses, and several of them use a water-permeable vapor retarder (WPVR). Each of the roof types is placed over a room with typical dwelling conditions and over a more humid room. Some of the roof sections contained construction moisture, while other were installed factory dry. The experiments were also simulated with a numberical model for combined heat and moisture transfer. This paper presents the results for the first two year of the experiment.

• country: Europe : Denmark
• experiment: hygrothermal performance : prefabricated, lightweight, wood-based membrane-roof
• prefabricate buildings, manufactured housing : prefabricated, lightweight, wood-based membrane-roof
• roof : prefabricated, lightweight, wood-based membrane-roof
• wood frame houses and walls, wood structure : prefabricated, lightweight, wood-based membrane-roof

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