We are renovating an old henhouse into a residence and have poured in 3 cubic meters of concrete on the existing but somewhat cracked floor slab. Since it's only going to be used as a summer house and remain unheated during the winter, we will not have underfloor heating.

Now I want to lay a wooden floor on this. How should I do to avoid moisture?

Is it enough to frame and lay a floor, or do I need to do something else?
 
The slab and concrete conduct moisture. If you place wooden studs directly on it, your wooden studs will mold within a couple of years, depending on the level of moisture exposure. If you use pressure-treated wooden studs, they will last for 10-20 years but will eventually start to smell terrible.

Best solution: Avoid wooden floors on that construction. Lay tiles instead.

Next best solution: Granab or Nivell floor with mechanical ventilation. Here, the floor stands on metal feet and is therefore not in contact with the floor. The mechanical ventilation ensures that the moisture is extracted rather than moving upward in the construction.

Solution that works in some cases: Platon mat and then a studded floor. This can work if the moisture exposure is not too high, otherwise, the moisture may take other paths and end up, for example, in the walls instead.
 
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