Lime-hemp as wall insulation: long-term monitoring system to investigate the hygrothermal performance

Lime-hemp has attracted attention as insulation material due to its promising ecological and hygrothermal properties. However, proper design and execution are crucial, as long-lasting moisture accumulation could lead to material degradation. This paper presents a case study that investigated the hygrothermal performance of lime-hemp as external wall insulation in a renovation project. To enable long-term monitoring with minimal disruption to building occupants, a low-cost and flexible monitoring system was developed and installed. The results emphasize the importance of the external render in protecting the insulation from moisture damage.Without adequate rain protection, moisture accumulation can occur. The findings provide valuable insights for designers and builders considering the use of lime-hemp.