Currently renovating the den in our split-level house from '69.

I've now pretty much torn out the entire floor with embedded wooden joists. These joists were still in okay condition considering their age, which led me to think it wouldn't be a huge problem to restore everything...

I considered my options and finally decided to lay cellular plastic and pour EPS concrete + floor leveling compound + water-based underfloor heating before something like parquet flooring.

Today, when I looked in, I was surprised to see quite a bit of moisture and water seeping in from what seems to be the lower part of the wall? We drained the house last summer with Isodrän, so it all feels a bit strange. Why is water coming in here?

What are my options now? Can I still proceed with the same floor construction? Should I instead have a ventilated floor like Nivell? The main thing is to ensure the moisture/water doesn't remain in contact with any organic material, right?

Basement room with removed floor showing moisture on lower wall, scattered debris, a black trash bag, a power drill, and a heater on the right. Close-up of a damp basement wall with visible moisture and deteriorating plaster. Signs of previous drainage work can be seen amidst the rubble. Moisture and water seeping in through the lower section of a basement wall, with exposed earth and concrete visible.
 
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