Moisture so mold food comes in many different ways into the house:
• Moisture penetrating from the outside - Rain and snow drainage
• Side room humidity - condensation.
The standard situation: Water from warmer air is reflected - as soon as they reached the so-called dew point - in the form of droplets deposited on cold or colder material.
Poor insulation - good chances for mold
Basically, cold rooms more susceptible to mold infestation, because warm air can store moisture are better. When it gets cold quickly poor insulation, because of the high heat losses. This leads then to a cooled-wall surface. Is it colder than 12.3 degrees (at a normal room air - 20 ° C room temperature, 50% humidity), the mold-critical temperature achieved: It provides moisture and mold.
• Room side hygroscopic moisture
Salts, present in all building materials have the property to absorb water from humidity in the air and building materials to accumulate.
• Moisture from the construction
Flood, inundation, new moisture or leaks from water pipes are of course also common reasons for excessive moisture of the house.