ᐅ Should the ceiling below the attic be insulated?

Hello. We are currently renovating a mid-terrace house built in 1963. Everything needs to be completely renewed: electrical wiring, water pipes, heating pipes, etc. The house is basically in a shell state right now. The interior ceilings were originally insulated with reed mats, which we have removed. Now the ceilings are basically completely "bare"... you can only see the concrete blocks. We plan to cover the ceilings with drywall (plasterboard) and had considered insulating the cavity between the ceiling and the drywall. However, we have been told that interior ceilings are no longer insulated nowadays. This confuses us... Heat rises and would escape through the ceilings and the attic (which is not insulated at all), wouldn’t it?

We have also read that at least the ceiling directly below the attic should be insulated. Long story short:

a) Do interior ceilings need to be insulated? If yes, what type of insulation material should be used?
b) Does the ceiling under the unheated and uninsulated attic need insulation? If yes, what type of insulation?
c) Should only the attic itself be insulated? If yes, what material is recommended?

We would be very grateful for your opinions!

You are renovating/restoring an old house, but someone advised you not to insulate the attic? From whom? The gas lobby? OF COURSE the attic should be insulated (common sense). Or, to be less diplomatic: it must be done (by law)! I recommend Section 47 of the Building Energy Act and consulting an energy advisor.

HausiKlausi schrieb:

You are renovating an old house, but have been advised not to insulate the attic? By whom? The gas lobby? OF COURSE the attic should be insulated (common sense). Or more bluntly: It’s mandatory (by law)! I recommend § 47 of the Building Energy Act – and consulting an energy advisor.

But not the ceiling from below, rather the ceiling from above.

Yes, that surprised us as well. And is it sufficient to insulate only the attic floor? Is it unnecessary to additionally insulate the ceilings of the interior rooms? Previously, there was also this reed material inside. Or did this reed serve a different purpose in the past?

So should I assume a wooden ceiling?
If you don't need the attic, I would recommend laying two layers of 12cm (5 inches) mineral wool crosswise on top of the attic floor.
If there are sloped ceilings in the living areas, don't forget to insulate those as well.

Joedreck schrieb:

So should I assume a wooden ceiling?
If you don’t need the attic, I would lay 2 layers of 12cm (5 inches) stone wool crosswise on top of the attic floor.
If there are sloped ceilings in the living areas, don’t forget those.

No, no wooden ceiling. Everything is solid with concrete blocks.