ᐅ Rooms cold on the floor – is insulating the basement ceiling a good idea?

Not really. You can only access it from the side if you knock out the old screed and lay something underneath.

2cm (0.8 inches) is not even enough for PUR; you need vacuum insulation for that. Really expensive – but also very effective.

And yes, don’t skip ceiling insulation, as that will cause thermal bridges again.

If you install parquet flooring or use a wool carpet instead of parquet, the floor will feel less cold underfoot.

Nice-Nofret schrieb:

If you install parquet flooring or use a wool carpet instead of parquet, it will also feel less cold underfoot.

Is that supposed to be a mediocre joke? There is even a carpet on top of the parquet. Naturally, it feels just as cold as the parquet. Anything else would be surprising.

Nanopixel schrieb:

There is one more question regarding the implementation: In this room (storage room), there are large wooden shelves that reach up to the ceiling and are anchored there. I suppose this should be changed and that the panels should not be glued around them?

Basically, cover the entire ceiling. If it’s only the posts/supports of the shelves, you can leave them out. That’s only a few square centimeters, which won’t make a difference. Also, since it’s on the cold side, there are no issues with moisture.

Nanopixel schrieb:

Regarding the living room: If the flooring is ever replaced (currently an aging parquet floor),

In my understanding, insulation won’t help here because wood doesn’t conduct heat; it simply takes on the ambient temperature.
The ongoing discussion about “parquet with underfloor heating” exists but is not impossible, since there are parquet types suitable for underfloor heating, mainly because the thickness of the parquet allows it.
You currently have older, probably thicker parquet, which simply adopts the room’s ambient temperature. At least, that should be the case. It does not conduct cold from below—or not significantly—so insulating the ceiling of the basement won’t make a difference. I haven’t personally experienced this but am just concluding based on this reasoning.

Nanopixel schrieb:

Even after heating for hours (with a conventional radiator), your feet stay cold—you feel chilled—and the floor temperature is between 17 and 18°C (63 and 64°F)

How warm is the room itself? Not near the radiator, but measured at the center— a) on the floor, b) at 1.50 meters (5 feet) height, c) under the ceiling? Heat naturally rises…

Nanopixel schrieb:

Was that supposed to be a mediocre joke?

Honestly, I would still suggest that in older houses without underfloor heating (or even without a basement), it is better to cover floors with rugs—not without reason, earlier people used to place Persian rugs and runners everywhere.
Floors without underfloor heating simply feel less comfortable.
I’d recommend installing a new floor covering with a mobile electric heating mat or retrofit underfloor heating underneath, or something similar.

ypg schrieb:

As far as I know, insulation doesn’t help because wood doesn’t conduct heat, it only takes on the ambient temperature.

The result is essentially the same since this ambient temperature is not static, but there is a constant heat flow between the “above” and “below.” This causes the average temperature between its warmer and colder sides to change continuously. Insulation is basically nothing more than a very high resistance to heat flow.

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