Insulate suspended ceiling? Heat from ceiling spotlights?

Yes, I didn’t do any installation either because my wife resisted. But I like panels. In hindsight, I would have liked to have made more wall outlets with panels. Well, maybe during renovations in 20 years.

Same topic, different location:

In the bathroom on the ground floor, a corner toilet with a corresponding pre-wall installation is installed.
In the angled corner, the wastewater pipe runs to the bathroom on the floor above.
Downwards, the wastewater pipe penetrates the concrete ceiling (of course airtight) into the unheated basement.
I have covered the basement ceiling around the flush tank and the drain pipe with a 16cm thick layer of glass wool insulation. All adjacent walls are interior walls.

On the internet I read everywhere now: "Be sure to stuff the entire space behind the wall from the basement ceiling to the room ceiling with insulation. Otherwise, a cold spot would form there with temperature differences to the warm bathroom, resulting in condensation etc."

But that is exactly the same story as with the suspended ceiling, isn’t it?

But isn't that exactly the same issue as with the suspended ceiling?

Nope. The uninsulated pipe can behave like the bottle of beer you take out of the fridge in summer. Moisture from the air can condense on it.
Probability? Very low. The problem often occurs with internally located rainwater drains. In autumn, these get ice cold when it rains and can become wet.
For such cases, you take an insulated pipe for a very small extra charge - both for the noise and because of the possible condensation (various manufacturers). Or simply stick insulation on it (various types, I understand).

The pipe itself is already insulated. The installer did that directly. It is about the cavity in the recessed corner, so to speak, the inner wall in front of the inner wall (which, however, facing the basement practically has an exterior side).

The pipe itself is already insulated. The installer did that directly. It’s about the cavity in the tucked-away corner, so to speak, the inner wall in front of the inner wall (which, however, has an outside-like side facing the basement).

If you have concerns, then fill it up. Please fill all cavities – including the living room, kitchen, etc. Otherwise, you will have mold problems everywhere. •Irony off•