Messtechnische Analyse flachgeneigter hölzerner Dachkonstruktionen mit Sparrenvolldämmung [Teil 3]

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.