Project: The damp-management study of the Zero Energy House using sensory data, Järvenpää Mestariasunnot Oy
Need: Investigating the damp-technical functionality of the wall structure (Zero Energy House)
Services provided by Boost: Construction Management services
Järvenpään Mestariasunnot Oy was founded in 1995, and its parent is the City of Järvenpää. Mestariasunnot own 54 properties with a total of 1785 apartments. The company’s net sales in 2015 were €14.5 million. The company´s mission is to provide flexible housing and functional homes for different stages of life. For several years, Mestariasunnot has installed dampness and temperature sensors in their buildings wall and floor constructions. The dampness and temperature data are measured and stored automatically several times a day.
Boost Brothers, together with Mestariasunnot, investigated the dampness of the structures of the Zero Energy House in Järvenpää. In addition, they studied how the information produced by sensors can be utilized in the management of the property portfolio.
The Zero Energy House was built in 2010 according to the new building regulations that come into force 2020. Heating is supplied by geothermal heat pumps, which are used for cooling during summer. Indoor water is heated by 35 solar thermal collectors. The electricity used in the building is generated by 72 solar panels and the ventilation system recovers about 80 % of heating for reuse. According to the general understanding of the construction industry, increased insulation thicknesses include the risk of dampness, allowing mold growth. The study investigated if this wall construction solution is designed as planned and the data measured by the sensors are reliable and usable.
Analyzing extensive measurement data
The study was conducted by analyzing the temperature and dampness data obtained from the Zero Energy House during several years, and by performing dampness and microbial studies. Results were compared to the data measured by the sensors.
Results of the project
The research shows that the wall structure is working as planned. The results of dampness and microbial studies showed no evidence of increased dampness or microbial damage. The data measured by the sensors produces useful and indicative information for the property owner in the long run. In managing a large property portfolio, the importance and value of knowledge is emphasized. In the future, the use of sensors is advised to be continued. Their installation and documentation needs to be done carefully so that the measurement data can be effectively utilized in monitoring the condition of the property.
“The results can also be used in public buildings, such as schools. This way, we will have healthier houses in the future”, says Veikko Simunaniemi, Managing Director of Järvenpää Mestariasunnot Oy.