Hello!

This winter, I will begin to furnish my basement, and I am thinking about how I should go about it.

The conditions for the basement are as follows:
The house was drained again last spring with Isodrän.
The standing height in the basement is 222 cm.
I want water-based underfloor heating, and all the walls are completely bare, meaning no material on them except paint, which I will sand off.
There is no insulation under the slab.
The ceiling in the basement consists of plywood with a very rough texture that doesn't look nice when patched and painted (already tried in part of the basement, maybe just a user error on my part :)).
I want to do everything to save as much height as possible.
The top floor has not yet been decided whether it will be tiles or wood-based.

For the ceiling, I plan to tear down the plywood and put up plasterboard and spotlights.
For the walls, I plan to frame with steel studs and then double plasterboard.
But now to my thoughts, and it concerns the floor.
I have three options. The first is to lay 30 or 50 mm grooved foam directly on the floor (I have in the rest of the house LK's system, http://www.rinkabyror.se/artikel/lk-sparskiva-eps-30mm-16-ror/).
The second option is whether to complement it and lay a platon mat underneath.
The third option is to skip the insulation and just lay a platon mat and the underfloor heating on it, which seems to be an option according to Isola.
Has anyone experienced one or the other? Is it enough with an insulation board directly on the floor? Should I complement with a platon mat? Or skip the insulation board altogether and just have a platon mat?

Thanks in advance!
 
I used LK's 16 mm EPS boards with 12 tubes. I have placed it on 1/4 of the basement. Uninsulated slab. See no increased energy consumption.
 
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