Insulation, frost-free attic, controlled residential ventilation, heated attic

Hello everyone,

I need some tips from you.

Originally, it was planned not to insulate our attic, only the ceiling of the upper floor. Since I am having a controlled residential ventilation system installed, it has to be placed in the frost-free area. Therefore, I need to change the insulation. After consulting with our construction manager, he recommends insulating the entire roof now, and in order to prevent the attic from being excessively heated, the upper floor ceiling as well. Is this okay, or will there not be enough heat coming up later through the insulated ceiling?

Hello

We have also insulated twice, there is already a temperature difference. But if I ever have to renovate the floor later, it is already insulated and sealed with foil. I don't want to start working with glass wool in the house again.

Best regards Sven