Question: How and why is condensation water formed on the windows in winter?

Answer: In the cold season, condensation water on windows is a common sight. The known consequences are mold formation in the silicone seams and in the adjacent wall on the one hand, and on the other hand, the constant formation of water on the windowsill is simply annoying.

Let’s go back to the past with this subject! Condensation water in this form was unknown to our “grandparents’ generation”. What they knew, however, were beautiful frost patterns on the window, which could be scraped off. The windows of that time always represented a thermal “problem”, since, on the one hand, it was always drafty and, on the other hand, there were the “frost patterns” described above. This planar freezing on the windowpanes shows, on the one hand, that condensation water was a problem back then, too, however, the consequence was the daily freezing on the windowpanes. In a very simple manner, this phenomenon got rid of the drying-out of the air in the interior, and due to the draftiness of the windows, the interiors were always well ventilated. With the daily scraping off of the formed window frost, the interiors always had dry air.

Modern apartments and buildings are highly insulated and thermally separated from the outside world. The excess moisture formed due to our living behavior cannot be absorbed by the walls anymore, since, due to the thermal outside insulation, the wall can only dry off towards the inside, and thus there is no absorption potential for internal moisture anymore. Excess moisture also cannot be permanently ventilated off due to drafty windows anymore. This moisture condenses at the cooler points of the outer shell of the apartment/the building, and normally these are the windows or thermal bridges.

Although state-of-the-art windows cool down, but do not undercut the freezing level at the interior glass, condensation water is formed instead of “frost patterns”.

How is condensation water formed on the insides of our windows?

This is always a combination of surface cooling of the air and missing or insufficient flow movement of the air. Therefore, surface condensation cannot occur, when one of the two parameters is missing.

In that, the temperature plays a role to such extent only, that, due to the air cooling off, the water carrying capacity is reduced. Therefrom results, however: the higher the room temperature, the more water condenses at the cooled off point.

Therefore, affected apartment/building owners should avoid the mistake of increasing the room temperature in order to tackle the condensate problem.

The condensate problem in apartments/buildings can only be reduced by several measures:

1. The ingress of water into the interior must be reduced (cooking, washing, drying, etc.)

2. The room temperature is to be kept constant, without nighttime lowering

3. Ventilation of the rooms on a regular basis with dry/cold air must be ensured

4. ATTENTION: an air exchange means fast venting/exchange of the room air and not cooling off of the room!

5. Sufficient air turbulence/air flow of the affected surfaces must be ensured – the use of a ventilator might be necessary!

6. The mold from already moldy areas must be removed in order to avoid contamination with spores.


Question: Why does BMB Gebäudehygiene not perform thermography of building shells for mold localization?

Answer: Thermographies are exclusively undertaken during the nighttime hours or at times, resp., when there is no direct solar irradiation. During this time, buildings and façades without an insulating layer (e.g. Styrofoam) emit the thermal energy absorbed during the day. Except for a few cases, thermographies only show the surface emission of the thermal energy absorbed during the day. Therefore, in the interpretation of warm wall surfaces, there often is the misconception, that the heat indicated originates from a direct transmission of the interior heat. If heat/cold transmission through masonry would pass in such an unhindered manner, then, in summer, the interior moisture formed would condense away from the wall, and in winter, the moisture would freeze directly on the wall. In all these cases, no free moisture would be available for wall mold. Therefore, thermography applied on the outside is not a suitable and conclusive technology to record the mold problem of a building/an apartment.


Question: Why is it so important that the BMB method is performed without mechanical treatment (brushing, scrubbing, milling)?

Answer: With any mechanical processing of surfaces, there is destruction of the surface texture. Depending on the type of processing, grooves, holes, furrows, etc. are caused on the surface, which are not visible to the human eye. For microorganisms, however, this condition is ideal, because in the permanently destroyed surface, all kinds of microorganisms – in particular mold – can settle well and become even more difficult to fight.


Question: Why can apartments, after treatment with the BMB method, be used again unrestrictedly, even by persons allergic to mold?

Answer: The BMB method removes mold and the mold’s mycelium even from deep layers (down to 3 cm!) as well as any toxic metabolic products. These undesired substances are bound in water and ejected from the wall, and after the treatment, are completely removed from the apartment. Therefore, after the BMB treatment, there is no allergic potential in the apartment anymore.


Question: Why does the wall surface infested with mold not have to be knocked off anymore?

Answer: Knocking off and the formation of dust can be completely avoided with the BMB method. The BMB method uses the absorbency of the walls infested with mold and extracts any undesired substances from the wall without any dust and without mechanical destruction. Following completion of the mold removal, the wall becomes open-pored and can remain free from destruction. Knocking off and the formation of dust are a thing of the past.


Question: Are toxins used for the BMB method?

Answer: No – the BMB method works completely free of toxins! Following completion of the process, there is no change in the pH value, and there are no hazardous substances like chlorine, hydrogen, surfactants, acids, lyes or other undesired substances in the wall anymore.


Question: Why is the BMB method so sustainable?

Answer: The BMB method extracts any organic substances from the treated surfaces down to deeper layers. Therefore, newly approaching mold spores cannot find nutrients anymore. Even with sufficient moisture, wall mold requires nutrients, which after the BMB method are not present anymore. Without nutrients, there is no sustainable colony formation anymore!


Question: Why is the mold removal in the BMB method not performed with nebulization?

Answer: Because nebulization with biocides inactivates the transmission routes via the air for a short period only. Since mold spores require suspended particles for dissemination, nebulization can achieve short-term disinfection of the entire air. The real problem, however, is not the transmission of mold, but the directly infested masonry. Nebulization has no influence on mold infestation located in the masonry. Therefore, a nebulization step is never used for mold removal in the masonry.


Question: Can I assign BMB Gebäudehygiene GmbH with paintwork?

Answer: No – BMB Gebäudehygiene GmbH provides for sustainable and reliable mold removal from masonry and wood. Since the BMB method also removes any discolorations from the wall, subsequent paintwork is no longer necessary in many cases. Should damages have occurred due to a wrong choice of paint or should the paint have been destroyed due to the activity of the mold, we recommend contacting your trusted master painter. Mold removal has got nothing to do with paintwork! Therefore, paintwork also has got nothing to do with mold removal! However, we would be happy to pass on the contact details of our known competent and reliable paint manufacturers, who will comprehensively inform you about the right paint for your living space.


Question: Why are mold removal products from the hardware store not a long-term solution?

Answer: Because these products are diluted biocides on the basis of chlorine and QAV. On the one hand, with the chlorine product, quick bleaching of the treated surfaces is achieved, and on the other hand, the QAV product ensures the longer NON-new formation of mold. In all these cases, the visible mold colonies are merely deactivated (disinfected). The result are died off microorganisms, which form the best breeding ground for future mold growth, and additionally, hazardous substances are stored in the masonry of your living space. Here, a short-term positive visual effect is sold as mold removal and you will become a “mold regular”!


Question: What is the difference between mold removal and mold disinfection?

Answer: With mold removal (BMB method), ALL mold components are micromechanically removed from the affected wall and are therefore no longer detectable. With mold disinfection using a biocide mixture or a biocide, only the emission of spores from the surface is hindered or killed off. In this case, all the parts of the microorganisms and all toxic metabolic products remain in the masonry. Then, mold is very easily detectable via an ATP measurement or via a UV method, since these test methods also detect any died off microorganisms.


MOLD HOTLINE: +43 (0)660 262 0262

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