Comprehensive insulation of an attic apartment

Hello everyone,

In the living room of my attic apartment, I have beams with wooden boards lying on top as the ceiling. Visually, I find it very nice, but the insulation is zero. I would like to lay styrofoam boards between the beams and then drywall panels on top, so that some of the wooden beams will still be visible. Would it be sufficient if I use 40mm thick styrofoam boards, then 12.5mm thick drywall panels on top, and seal these on the outside against the wooden beams with acrylic? That way I would have some insulation.

Or is there possibly the option to insulate the whole thing from above, meaning to lay insulation material on the attic floor or similar.

Regards

You can do it, but in my opinion, it brings far too little because you have many thermal bridges and the styrofoam is also not the best insulator. If the current appearance is important to you, then an insulation above the ceiling makes sense. A layer of insulation is then applied over the entire ceiling. It is important that this is well sealed.

Isn't the roof above insulated?