ᐅ Updating an Older Home with Underfloor Heating – Experiences

Hi,
after having my eyes opened by another post here, I am now trying to educate myself on renovating our old building...
The house, built in 1952, is in almost original condition. The current plan includes new windows and front door, cavity wall insulation, and the floors.

At the moment, there is a gas heating system with a low-temperature boiler and radiators installed. Since my parents live in a similar house, where the floors are always very cold, I would like to approach this differently.
My idea: install underfloor heating and remove the radiators! The simplest solution that I can install myself seems to be using dry screed panels, into which I can lay the underfloor heating myself.
Now the questions:
1. Is additional insulation needed above the basement ceiling? The basement ceiling structure: concrete vault between steel beams, with wooden joists and floorboards on top. No insulation currently.
2. Is it better to insulate the basement ceiling from below, or to remove the floorboards, add loose-fill insulation, and screw the dry screed panels onto the joists? Or have insulation blown in?
3. The front door will also be replaced, which is not a big problem, but how can I adjust the stair treads leading to the upper floor to match the new floor height? It’s a simple wooden staircase.

I look forward to your answers!
Good luck
Heiko

Good morning!

If I understand the other thread correctly, it is a) about rental and b) initially about the minimum necessary energy retrofit.

If the floorboards are in good condition, I would be reluctant to remove them. They often contribute to the charm of old buildings. I would only refurbish them. Underfloor heating would be overkill in this case. Possibly, the basement ceiling could be insulated from below. However, I am not an expert on that.

Yes, the wooden floor would look great, but unfortunately it is very noisy. Since there will be an apartment both above and below, this is not possible. Good luck

Maybe through the ceilings. You insulate and install soundproofing from below. It also depends on where the sound is transmitted. In the end, the floorboards will be removed and laminate flooring with impact sound insulation will be installed, which won’t have much effect.

That's why I'm considering whether the layer between the concrete ceiling and the floor should be filled with insulation. That should not only provide thermal insulation but also improve soundproofing... Has no one had any experience with this?