Mold - not always visible


Mold efflorescence is a clear warning to anyone that something needs to be done. However, even mold that is not visible, may already make you sick. How to track down mold anyway and why it is often invisible is explained in this article.

Hidden mold

Mold is not only found on surfaces, but can also be hidden. Schimmel even likes to stay in hidden, hard-to-see places because there is less draft. Standing, moist and warm air promotes the development of mold.

Possible infestations

  • wall niches
  • underneath panels or panels
  • under the screed
  • below the flooring
  • behind furniture
  • in cavities in the house

Hidden mold can be responsible for the fact that even in visible places at (for the mold) favorable conditions again and again mold infestation occurs, and then disappears again.

mold spores

If the living conditions for the mold are nowhere so favorable that it can spread, there may nevertheless be a high number of mold spores. Even high numbers of spores can make you sick, but spores are generally invisible to the naked eye.

Signs of a hidden mold

In addition to these sporadically occurring infestation problems in the visible areas, there are also a few other signs that may indicate that hidden mold has spread:

  • Mold smell, either musty or after earth and forest, is a typical sign, but only occurs clearly in case of already high infestation
  • Textiles will over time pick up musty, musty odors when in the house
  • typical mildew diseases (shortness of breath, allergies, even watery eyes and concentration problems) can be caused by mold as well as other building pens
  • Silverfish, woodlice and so-called thunderstorms can be an indication of hidden mold

Track down hidden mold

For the detection of hidden mold there are different methods. The most reliable is always a room air measurement. It shows decomposition products of dead mold and metabolic end products of living mold even in the smallest amounts in the room air (so-called MVOCs). This examination will be carried out by a specialist assessor and in some cases health authorities will carry out such measurements.

Schimmel Beagle

Especially with invisible infestation is often also a gray beagle used. Since dogs have an excellent sense of smell, they can, as well as the room air measurement, detect even the smallest amounts of mold. This is not difficult for dogs, because mold smells very clear and strong for them. The trained dogs are often even better than devices. The method to find mold with tracking dogs originally comes from Sweden, but is now also common with us.

Tips & Tricks

If you have even the slightest suspicion that mold may be hiding in your house or apartment, you should immediately start your search. Do not take this lightly.


Video Board: Why Have a Mold Inspection and Testing ? Watch and Observe!