U-value and Mold Measurements on Heritage Buildings Using greenTEG`s gO-Measurement System

U- and aw-value measurements were carried out at the listed post-medieval Patrician mansion in Immenfeld in the canton of Schwyz. The owner intended to restore the home to rent out the premises for events and the following questions arose:

  • Was it possible to reduce the proposed insulation thickness of 16 cm of sheep's wool (as per expert’s original recommendation) in the inner wall insulation?
  • Could the cellar be used as a storage area for furniture without the risk of mildew?

The measurement with the gO-measurement System (gOMS) showed that the U-value of an existing wall was 0.7 W/(m2 K), which was much better than the originally assumed value. As a result, the thickness of the new interior insulation could be reduced to 8cm to meet the maximum U-value of 0.3 W/(m2K) for listed historical heritage buildings (Canton Schwyz). A new wall insulated with 16 cm thick virgin sheep's wool (inner insulation) resulted in a U-value of less than 0.1 W/(m2 K), which is well below the Swiss Minergie standard of 0.15 W/(m2 K).

The humidity of the cellar wall is below 80% which proved that there was no risk of mold growth during winter.

Conclusion
U-value and aw-value measurements with greenTEG’s gO-Measurement System allows "as-is" conditions to be accurately verified with the following advantages:

  • U-values in old buildings are often better than assumed: Correctly sized insulation saves space and costs
  • Taking the right measures to protect against moisture prevents undesired damage caused by mold.

This case study has been published in German in Denkmal und Energie 2019

 

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