Mold in the new building - can that be?

That can even be very common. Some associations even assume a mold load at 40 - 50% of all new buildings. What causes mold in new buildings usually has and how to avoid it, you will learn in detail in this post.

Frequency underestimated

Mold is suspected primarily in old buildings. However, new buildings are even more frequently affected by mold problems today. Particularly problematic: in many new buildings, the mold infestation is not even discovered, or much later. This can threaten at a later date enormously high renovation costs and major problems.

Causes of mold in new construction

The main causes in the new building are the same, as with mold in the old building also:

  • high humidity under construction (complicated by the additional "building moisture" in the new building)
  • lack of control
  • partly also improper work
  • Presence of mold spores (can be assumed almost everywhere)

winter construction sites

Winter construction sites are particularly susceptible to mold. Here, in practice very often waived a professional and really comprehensive coverage. This usually has time reasons - if the time for the covers is saved, can be worked faster, thereby often reduce the cost of individual providers.

Possible damage

Due to the ingress of weather and snow, the walls and foundations are soaked in the shell. The moisture can work its way up through the masonry, so that even large parts of walls are moistened evenly. Drying out is often not possible in cold weather. There are also hazards due to frost (ingress of water and subsequent freezing can cause flaking and surface damage).

Lack of heating during interior work

During interior work, the building is already completely closed externally. By installing the screed and the cleaning materials, a high amount of moisture is additionally introduced into the building. If not heated dry and the moisture dissipated by proper and targeted ventilation, often threatened by mold.

condensation problems

If not all the insulation (for example, under the roof structure) are attached, the warm, humid indoor air can condense in such places. The depositing moisture can not dry out in colder areas and then quickly leads to massive moisture penetration and mold on the respective component.

Prevention of mold in new buildings

The above mentioned causes should be avoided at all costs. It is also important to always check the construction site carefully for signs of mold and moisture. If you suspect mold, you should definitely consult a construction expert. Proof of possible construction errors should always be secured immediately - this may depend on later warranty claims.


In any case, the liability always applies completely to the executing company. If it makes construction mistakes, it must completely fix these mistakes on own account.

Tips & Tricks

Always make sure that you insulate already insulated areas of the house against uninsulated by the installation of suitable building doors sufficiently. Temperature gradients are - just as in the finished house - a problem on the construction site.

Video Board: New Construction Mold