Facts About Mold! Mold formation and growth factors.

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Mold spores are practically everywhere

Mold spores are tolerated with the air. 

However, they can only grow where there is a suitable breeding ground, such as on damp surfaces.


  1. Mold spores are practically everywhere
  2. Growth factors for mold
Window condens

Mold growth  is therefore always due to moisture and often develops in secret.

The air inside is usually warmer and therefore absorbs more water than the cold outside air.

If this air is not discharged sufficiently and in a suitable manner, it can condense in various places in the house.

These damp spots can be an ideal breeding ground for mold and bacteria.

The reason for an infestation can be the poor state of construction of the building, or simply the presence of people who breathe and exude sweat. Everyone gives off one to three liters of water through their skin within a day.

Cooking, showering or bathing also increases the “moisture production”, just like indoor plants.

Mold often forms when several people live in a confined space.

Hot air can store more moisture than cold air, which is why it is important in winter to heat enough so that the moisture does not settle on the cooled-down outer walls.

Thermal insulation is often poor, especially in old buildings. 

However, this has little effect on rainwater that collects in walls with a damaged external facade. Rain is often the cause of damp walls and mold.

In the case of leaky old windows and newly insulated walls, on the other hand, air is constantly drawn through.

Such apartments, as a rule, avoid mushrooms.

On the other hand, in the event of water damage or a leaky shower tray, moisture can also collect in the masonry, so that the fungal spores find an ideal breeding ground.

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Growth factors for mold

From a humidity limit of 65% RH, molds settle. 

They also need nutrients and the right temperature, which is optimal for their growth in most residential buildings.

Mold growth along the baseboards

Survival is already assured on surfaces with a pH range of 3 to 9, the value at 5-7 being the most optimal. 

However, it can also happen that the spores settle on surfaces with much higher values, in which case a so-called biofilm of dust deposits has formed.

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