Hygrothermische Berechnung der Einsatzgrenzen unterschiedlicher Systeme bei der Aufdoppelung von Wärmedämmverbundsystemen

Hygric calculations of the application limits of different additional ETICS systems.

A lot of exterior thermal insulation composite systems (ETICS) on existing buildings are still performing well, but they do not comply with actual standards of energy saving. In most cases a dismantling and substitution of these systems is not reasonable from the economic and ecologic point of view. An alternative solution may be to apply an additional ETICS on top of the existing one. Hence the aim of the investigations is to assess which combinations will work well and which will cause hygric problems. For eleven different combinations the moisture balance has been investigated by one-dimensional hygric calculations. All systems show low mean water contents, which will not result in a reduced insulation performance. But with four of these sys tems high local moisture contents have been observed, which may cause problems due to frost or draining condensate.