Hi, My house is built in 1970 and with decent quality. To make the basement livable I am going to add water floor heating with insulation underneath.
The construction: there is 12 cm concrete slab and underneath it is singles (makadam). on top of this concrete slab it was light concrete of 8 to 10 cm.
Note: after removing that light concrete and also few centimeters of the main slab, I got now ruffly 12-14 cm of total space.
Theory: is that I can use - xps cellplast around 8cm on top 1,6mm pipe for water heating and then close it with light concrete ruffly 4cm. Why XPS you might ask it has the higher Lambda then EPS cellplast and it is close cell meaning better moisture resistance.
Questions: will this work? has someone try this solution or only insulate their basement? do I need platonmatta or another type plast? can there still be issues with moisture?
side note: I have already done drainage just with 20cm isodarin around the basement.
