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Author(s):	Nusser, B.; Teibinger, M.; Bednar, T.
Title:
Abstract:	Im dritten und abschließenden Teil dieser Aufsatzreihe werden die Messdaten aus hinterlüfteten und nicht hinterlüfteten flachgeneigten Metalldächern diskutiert. Diese wurden im Freilandversuch über 17 Monate unter besonnten und Vollzeit beschatteten Randbedingungen untersucht. Hierbei zeigt sich, dass bei besonnten Bedingungen in beiden Dachaufbauten die innenseitige Dampfbremsbahn durch eine OSB ersetzt werden kann, ohne dass sich kritische Klimabedingungen oder erhöhte Materialfeuchten im Gefach einstellen. Die verwendete Gleitbügelblecheindeckung beim nicht hinterlüfteten Dach ermöglicht einen diffusionsoffenen Aufbau. Das hinterlüftete Metalldach zeigt trotz geringen Luftvolumenstroms in der Hinterlüftungsebene das günstigste hygrische Verhalten aller untersuchten Dachauf bauten. Measuring investigations of the hygrothermal behaviour of timber flat roofs - Part 3: Ventilated and non-ventilated metal roofs. In the third and last part of this article serial the measuring values of ventilated and non-ventilated metal roofs are discussed. The roofs were investigated at a full scale test under sun-exposed and full-time shaded conditions. It was shown that at sun-exposed conditions the vapour retarder membrane in both metal sheeted roofs can be replaced by an OSB without critical climate or increased moisture content in the cavity. The used metal sheeting at the non-ventilated roofs enables a water vapour permeable construction. The ventilated metal roof showed in spite of the little airflow in the ventilation layer the best hygrical behavior of all investigated roofs.
Source:	Bauphysik 32 (2010), No. 5
Page/s:	288-295
Language of Publication:	German

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