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Hygrothermal simulation of green roofs - new models and practical application

: Stöckl, Beate; Zirkelbach, Daniel; Künzel, Hartwig M.

Arfvidsson, Jesper (Ed.) ; Univ. Lund:
NSB 2014, 10th Nordic Symposium on Building Physics : 15-19 June 2014, Lund, Sweden; Full Papers
Lund, 2014
ISBN: 978-91-88722-53-9
Nordic Symposium on Building Physics (NSB) <10, 2014, Lund>
Conference Paper
Fraunhofer IBP ()

Design and installation of green roofs on wooden constructions requires special care because of the low inward drying potential in the summer months. Within a research project new models to calculate green roofs reliably by the help of hygrothermal simulations were established. Based on experimental investigations of green roofs in Holzkirchen, Leipzig, Vienna, Kassel and Milan different models were developed which provide a reliable basis for moisture control design of extensive green roofs. After validation the model has been used to arrive at general practice recommendations for wooden lightweight green roofs. The critical condition in light-weight flat roofs is normally the water content in the exterior sheathing. For design purposes it shouldn't exceed a limit value of 18 % by mass - this is to prevent wood decay but includes a safety factor. To fulfil this requirement an additional insulation layer above the exterior sheathing is often necessary.