论文信息 - Einfluss von Undichtheiten bei der Sanierung von Plattenbauten mit Wärmedämm-Verbundsystemen

Einfluss von Undichtheiten bei der Sanierung von Plattenbauten mit Wärmedämm-Verbundsystemen

External thermal insulation composite systems (ETICS) are a common measure to retrofit concrete heritage buildings. ETICS improve the thermal performance of the wall and are intended to provide good rain protection for the load bearing substructure. The second point is of special interest in case of incipient corrosion of the reinforcing steel in the rain screen. However, leakages especially at window joints can cause rain water penetration to the material layers beneath the ETICS. The influence of such leakages is evaluated in this paper, using hygrothermal simulations. The results show that ETIC systems with vapour permeable insulation materials like mineral wool provide a good drying potential towards the exterior and thus allow good corrosion protection even in case of smaller leakages. The use of vapour retarding insulation materials like expanded polystyrene prevents additional moisture contents from drying out and leads to less favourable hygrothermal conditions at the reinforcement of the rain screen. key words: external thermal insulation composite systems (ETICS), concrete sandwich panels, driving rain protection, corrosion of reinforcing steel WTA-Almanach 2008, S. 285 -297 4

Hartwig M. Künzel | Daniel Zirkelbach | Petr Slanina

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