Then the basement quickly becomes a 'really cool' lounge
Have you, dear respondent, ever looked at the original question of the asker?
"Hendrik1980" had stated the following:
"Our basement is to exclusively house the laundry room, storage, pantry, and utility room. Not least for cost reasons, we are foregoing heating, insulation, and plastering or painting work here."
According to the plan, the floor slab is therefore intended to serve as the static foundation for rooms with subordinate purposes.
This means that there is neither thermal insulation nor, which is much more important, any waterproofing under the floor slab!!
In practice, it is assumed that there is always an air humidity of about 90% beneath a ground-contact floor slab.
In the functional rooms above, the air humidity is always lower. If this rises (through the floor slab) and moistens the functional room (and it definitely will through the concrete matrix), this has no impact on the use.
But now the demand is placed on a room for a higher-quality use: as a party room or study.
It will be nicely heated, which promotes the speed of moisture equalization due to a lower relative air humidity.
Long story short:
A room with a subordinate function according to the plan cannot simply be converted into a room with higher-quality use!
High humidity, and thus a high probability of mold growth, an unfavorable room climate, and cold feet are the consequences to be borne by the builder.
Building is connected with accompanying aspects of building physics that one must necessarily know if one builds— or is "only acting as an advisor."
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Good luck to "Hendrik1980": KlaRa
