I need help choosing a path.. 
(House built in 1938)
Currently, there's a 60m2 concrete slab with an unheated basement underneath. On top of the concrete slab, there are 70mm joists directly on the concrete, followed by a plank floor. No insulation whatsoever.
Now it's time to fix this as we're undergoing a major renovation and want to install underfloor heating (I know these are not optimal conditions).
Option 1:
*Remove the floor and joists.
*Cast 70 mm EPS concrete
*Underfloor heating
*Self-leveling compound
Option 2:
*Remove the floor and joists.
*Install Subfloor/Nivell/Granab
*Insulate with 45 mm Paroc eXtra plus t to create an air gap between the insulation and concrete.
*Floor chipboard with underfloor heating.
In terms of cost, it breaks even; the advantage of Option 1 is that it can be executed faster. Option 2 gives me an air gap that I can ventilate since I'm a bit skeptical about sealing it completely. Today it's bone dry under the floorboards thanks to the proper ventilation.. If I seal too much, I imagine I might encounter problems down the line.
Are there other options I'm not thinking of?
(House built in 1938)
Currently, there's a 60m2 concrete slab with an unheated basement underneath. On top of the concrete slab, there are 70mm joists directly on the concrete, followed by a plank floor. No insulation whatsoever.
Now it's time to fix this as we're undergoing a major renovation and want to install underfloor heating (I know these are not optimal conditions).
Option 1:
*Remove the floor and joists.
*Cast 70 mm EPS concrete
*Underfloor heating
*Self-leveling compound
Option 2:
*Remove the floor and joists.
*Install Subfloor/Nivell/Granab
*Insulate with 45 mm Paroc eXtra plus t to create an air gap between the insulation and concrete.
*Floor chipboard with underfloor heating.
In terms of cost, it breaks even; the advantage of Option 1 is that it can be executed faster. Option 2 gives me an air gap that I can ventilate since I'm a bit skeptical about sealing it completely. Today it's bone dry under the floorboards thanks to the proper ventilation..
If I seal too much, I imagine I might encounter problems down the line.Are there other options I'm not thinking of?
