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Exterior or interior insulation for the basement with pressing water?

: Zirkelbach, D.; Künzel, H.M.; Bludau, C.

Gawin, D. ; TU Lodz:
Research on building physics. 1st Central European Symposium on Building Physics 2010. Proceedings : 13-15 September 2010, Cracow - Lodz, Poland
Lodz: Technical University of Lodz, 2010
ISBN: 978-83-7283-367-9
Central European Symposium on Building Physics (CESBP) <1, 2010, Lodz>
Conference Paper
Fraunhofer IBP ()

Under middle European climate conditions interior insulations normally show a less favourable hygrothermal behaviour than exterior insulations and should only be used if exterior insulation cannot be applied for example in case of heritage conservation. The situation is different for basement insulations especially in case of ground or pressing water. Under such conditions an interior insulation can provide a better solution than a perimeter insulation which experiences a moisture accumulation in case of minor leakages between insulation system and wall. An ideal insulation should allow some dry out of the construction if necessary. In the basement a drying process is only possible to the interior side as the humidity in the soil is around 100 % RH all the year. Vapor retarders with a variable vapour permeability depending on the humidity of the surroundings can help to dry out moisture from roof or wall constructions in summer time. The paper will show that they are also suitable for the basement situation and can help to improve the hygrothermal conditions within the constructions compared as well to exterior insulation as to interior insulations with conventional vapour retarders.