The Fraunhofer Institute for Building Physics IBP has been studying the effects of mold for decades. Its scientists carry out intensive research on solutions and tools for preventing, combating, classifying and evaluating the mold caused by moisture. Using a baseline survey, the scientists are now showing how widespread mold and moisture problems are in German and European homes and what effects they have on people and buildings. In this way, they are confirming the need for continuous research and further innovative solutions.
Mold infestation is not a rare phenomenon. In Germany alone, some 10 percent of all structural damage to buildings is related to mold. If the building is not allowed to breathe or if the occupants do not air the rooms sufficiently, moisture can build up in the interior.
Reasons for mold-related damage in well insulated buildings.
© Fraunhofer IBP (according to Oswald, R., Liebert, G. Spilker, R.: Schimmelpilzbefall bei hochwärmegedämmten Neu- und Altbauten. Bauforschung für die Praxis, band 84. Fraunhofer IRB Verla
This leads to excessive humidity, which in combination with cooler external walls – par example because of deficient thermal insulation – provides the ideal conditions for mold to thrive. Another problem is when people move into new buildings too soon after construction, as excessive residual moisture can also quickly lead to mold formation. Further common construction-related factors that can lead to mold are defects such as thermal bridges, faulty insulation work, water damage from defective pipes, and poorly positioned furniture that prevents air from circulating between the walls and the furniture.
According to a survey conducted by Fraunhofer IBP scientists, some 84 million people in the European Union – including Iceland, Norway and Switzerland – live in damp homes. The consequences for their health can be serious. For example, asthma has long been very prevalent, affecting 7 percent of adults in Europe.
“In the baseline study we carried out, we concentrated on the relationship between mold in interior spaces and its effects on the health of occupants,” explains Prof. Gunnar Grün, deputy director of Fraunhofer IBP and head of the Energy Efficiency and Indoor Climate department.
“For instance, we quantified the risk for people living in homes with mold problems of developing a respiratory disease. Fundamentally, we are convinced that mold and mold prevention are an important topic for research and development into healthy living. The baseline survey we carried out offers additional proof of this.”
Excerpts from results and findings
Fraunhofer IBP’s baseline study compiled data from 170 scientific surveys. These were based primarily on observations and did not include experimental studies such as clinical trials. The majority (99) were empirical studies, while the remainder were case analyses (31) and cohort analyses (40). The evaluation for the meta-study shows a clear correlation between respiratory tract infections and damp, moldy interiors.
Prof. Grün and his colleagues were able to demonstrate that the probability of developing asthma is 40 percent higher when people live in a mold-infested home. When we apply this ratio to the number of Europeans who live in damp homes compared to those who live in homes without moisture problems, this gives us a figure of about 2,2 million people who suffer from asthma specifically because they live in a damp, moldy environment.
In order to combat this illness-causing problem of defective building stock, future renovation efforts must stress the importance of professional planning, design, and workmanship. If indoor climate and structural engineering conditions were improved during renovation work, the number of people affected by the problem could be reduced. If we take a conservative modernization rate of 2 percent per year as a baseline together with higher quality such that only 8 percent of renovated buildings are affected by moisture problems instead of 16 percent, by 2050 we would see around a 25-percent drop in the number of people experiencing these problems. In the case of asthma, this would result in approximately 550,000 fewer people developing the illness, with the associated reduction in costs for the public health system.
Approaches to tackling the problem
In addition to being unhygienic, the uncontrolled growth of mold inside homes is also a potential risk to the health of the people living there. By the time a patch of mold becomes visible, there is already an area of 20 square centimeters that requires urgent treatment. In various departments, Fraunhofer IBP carries out research into issues such as how to avoid and combat unwanted moisture in building components and develops solutions including balcony reinforcement anchors for reducing thermal bridges. Transient calculations of the coupled one- and two-dimensional heat and moisture transport in multi-layer components and buildings can be carried out in advance under natural climate conditions thanks to the WUFI® (a German acronym that stands for heat and moisture transiency) software family. This calculation method was developed at Fraunhofer IBP and validated on outdoor and laboratory data from all over the world. Among other things, it makes it possible to realistically calculate the transient hygrothermal behavior of components and buildings under natural climate conditions. In addition, the scientists create evaluation classes to grade the risk to health and test the environmental compatibility of algae and fungi biocides. Other building physics aspects that can be explored in order to prohibit the problem of damp homes and mold infestations include investigations into the drying behavior of components and the question as to whether individual fireplaces or stoves eliminate the risk of mold growing on the interior side of walls.
Presse Institute Kommunikation | Fraunhofer-Gesellschaft
Construction Impact Guide
18.05.2018 | Hochschule RheinMain
New, forward-looking report outlines research path to sustainable cities
24.01.2018 | National Science Foundation
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology