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Building physics and durability

: Künzel, H.M.

Freitas, V.P. de; Corvacho, Helena; Lacasse, Michael ; Departamento de Engenharia Civil, Faculdade de Engenharia da Universidade do Porto -FEUP-:
XII DBMC 2011, 12th International Conference on Durability of Building Materials and Components. Vol.1 : Conference Proceedings; 12th - 15th April 2011, Porto, Portugal
Porto: FEUP, 2011
ISBN: 978-972-752-132-6
International Conference on Durability of Building Materials and Components (DBMC) <12, 2011, Porto>
Conference Paper
Fraunhofer IBP ()

The durability of building materials and components depends to a large extent on phenomena belonging to the realm of building physics. Impacts from natural weathering and building operation are important degradation parameters for building envelope systems. While some well-known loads such as UV-exposure of exterior surface materials depend only on the local climate conditions, other parameters are strongly influenced by the construction itself. Especially the hygrothermal response of building envelope systems is governed by transport and storage characteristics. E.g., thin exterior surface layers of well insulated components show much greater temperature and humidity fluctuations than massive façade structures. Also, the occurrence of extreme values depends on external loads and the component's physical properties. Solar radiation may be absorbed or reflected; rain-water may be absorbed or drained away. Hygrothermal interia helps to prevent overshooting temperature and humidity conditions.