ᐅ Insulating a slab foundation – but how?

Hi
Exactly, and this is where a sharp pencil is an advantage. The result will be that the money saved on insulation costs can fund a big party with friends. For those occasional moments when you want to spend time in the garden shed, a sturdy oak floor and wooden walls are sufficient.
Good luck

This is how it looks because insulation is not a heating system. I maintain that the effort is simply too high and the benefit too low. If the house has deficiencies, then invest in insulating the windows and doors. Also check the transitions between the walls and the roof.

This can already be done for a relatively low cost.

Just let him do it, it will bring money back into the economy 🙂 You can remove the existing floor and install a proper concrete slab, if necessary even with underfloor heating 🙂 If money is no object, you can build so many nice things

I believe money does play a significant role. In the case of insulating the foundation slab, I also don’t see much benefit. It costs a lot of Swiss francs and in the end, the savings are minimal.

Okay, I understand. My reasons are that we want to feel comfortable in the garden. But 12°C (54°F) room temperature is just too cold in winter. Alright, I will buy a fan heater and then it will work. I am less concerned about the energy costs.
Thank you very much for your information.

My situation is similar:
I want to convert my basement into a workshop. Since I will be retiring soon, I will probably spend time there daily.
The floor, walls, and ceiling are concrete, built in 1996. The special feature is that this basement is built into a hillside, and my parking space is located above the basement ceiling.
My plan is to insulate the floor slightly before laying vinyl (or similar). I have no issues with the doors, as there is currently a step of about 5cm (2 inches) height.
I will paint the walls and ceiling.