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

 

More news

Thermal and Structural Performance of Geopolymer Concrete Containing Phase Change Material

Read more

U-value measurements on a roof: challenges and best practices

Read more

greenTEG is hiring!

Read more

Effects of electrode composition on heat generation in Electrical Double Layer Capacitors EDLCs

Read more

We will visit the Medtec fair in Japan

Read more

Thermal Analyses of Crushed-Rock Layers for Permafrost Protection

Read more

Where to meet us: upcoming show and fair participations

Read more

gO-Measurement System used to estimate the specific thermal capacity of building components per unit surface area

Read more
Read all