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

Interview at Venturelab: greenTEG and the COVID-19 crisis

Read more

TeleTop interviewed Wulf Glatz (CEO, greenTEG AG) on COVID-19 and how the gSKIN® Fever Temp Patch can help solving our current pandemic

Read more

greenTEG AG offers to sponsor Covid-19 research with its unique fever-monitor

Read more

In Operando Calorimetric Measurements for Electrochemical Capacitors

Read more

COVID-19 ¦ greenTEG global preparedness

Read more

Using gSKIN® heat flux sensors for the calorimetric measurement of batteries

Read more

A heat flux sensor test setup

Read more

Thermal transmittance measurements to analyse deviations between actual and modelled house thermal performance

Read more
Read all