12cm full thermal insulation, ventilation system required

We will start building in April and have decided on 24 cm perforated bricks and 12 cm full thermal insulation. Now I would like to know if a ventilation system is really necessary to prevent mold growth in the long term and to ensure a good indoor climate. Unfortunately, even expert opinions differ on this matter.

Hello

... Now I would like to know if a ventilation system is really necessary to prevent mold growth in the long term and to ensure a good indoor climate. Unfortunately, even expert opinions differ on this.

Much has already been written here on the topic of ventilation, controlled residential ventilation, heat recovery. Just search for it.
Best regards

As already noted in another (green) forum:

Now I would like to know whether a ventilation system is really necessary to prevent mold growth in the long term and to ensure a good indoor climate.

Only you yourself can ultimately answer that question exhaustively.

The participation activities required from you in this regard can, if in doubt, be derived from the ventilation concept of your contracting partner, which must be created according to DIN 1946-6. You should ask him about it!!!

You can find plenty of background information on the internet to get started.

Unfortunately, even expert opinions differ on this matter.

"Wess' Brot ich ess ..."

KPS

Hello Stephan,

Basically, modern houses are increasingly built airtight to achieve the desired energy-saving effects. What use is an insulation panel if its connections are not airtight? Nothing!
However, airtightness creates new challenges. The air in the rooms gets used up through usage and must be regularly exchanged. Furthermore, humidity increases due to our breathing, cooking, pets, or plants, which previously more or less escaped through leaks.
As a result of this development, there is the necessity to fundamentally handle a modern property differently. The "user manual" has practically changed; the user must follow certain rules to prevent, for example, mold from developing!
This is where controlled residential ventilation ([Kontrollierte-Wohnraumlüftung]) comes into play. Generally, this is not absolutely necessary if you follow the "rules" and ventilate regularly. This naturally throws money out the window in the form of energy but at the same time maintains air and room quality.
Like everything, controlled residential ventilation has advantages and of course some disadvantages worth discussing.
Among the advantages, besides energy savings, are:
- automatic fresh air supply
- no drafts
- prevention of mold formation
- noise protection and
- pollen-free indoor air for allergy sufferers

Disadvantages can be:

- additional costs for system technology
- not for fresh air fans
- no special subsidies

Basically, you have to decide for yourselves whether controlled residential ventilation makes sense for you. It is essential to involve the energy consultant and planner, who will compile your concept based on your requirements and user behavior, legal requirements, and possibly desired funding guidelines.