We need more rooms and are going to make two bedrooms out of a former garage, about 30 m2, which is connected to the house (from -51).
I'm a bit worried that the indoor environment won't be 100% good! Moisture and emissions and the like.
We will be installing a mechanically ventilated floor on the concrete slab. (Platon with fan etc). What do you think? Do you think this will work well and be suitable for use as bedrooms?

Hope to hear your opinions, thank you!!
 
The house has a basement, on a concrete slab.
The garage is attached to one side of the house. (I.e., above ground level) and also on a concrete slab. It is a double garage. The part closest to the house is the one we want to convert into a bedroom. The other garage will be used as "storage."
There is probably no drainage around or under the garage.
The soil around the house and garage is clay.
The exterior walls are masonry.
Should one install drainage like Platon alongside the concrete slab on the two sides that are not attached to the house and "storage"?
 
1000 thanks for your exhaustive answer. We'll start by fixing the drainage.
I still think we will build a mechanically ventilated floor since that way we can get rid of radon. (Have done radon measurement which was above 200).
Do you have any experience with mechanically ventilated floors?
 
Short-term measurements have been made earlier, 160 Bq in the basement room, and 250 Bq in the bedroom which has a door open to the former garage. The previous owner had made an office in part of the former garage.

The question is whether the radon is coming from the former garage... How can you determine if the radon is coming from the ground or the building material?

I find it strange to get a lower value in the basement than on the ground floor?
 
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