ᐅ Screed installation in the attic – ceiling between attic and living space

Hello,

I am currently building a KFW 55 house, with an insulated roof and an attic (concrete ceiling) below it, and living space beneath that. I would like to plan for a screed floor here.

My question is whether the screed between the attic and the living space is sufficient as insulation, or if I should add insulation material. How much heat would be lost here?

Regards

NeulingXX schrieb:

Now to my question: is the screed between the attic and the living area sufficient as insulation?

The screed does not provide any insulation. Otherwise, it would be called insulation and not screed. 😉

Question: Why insulate the upper floor ceiling if you already have an insulated roof? What are you planning to use the attic for? Why screed?

SaniererNRW123 schrieb:

Screed does not provide any insulation. Otherwise, it would be called insulation rather than screed 😉

Question: Why insulate the upper floor ceiling if you already have an insulated roof? What do you want to use the attic for? Why screed?

The attic is intended to be used as a storage area.
I initially wanted to leave the attic without screed.
However, there are too many pipes and cables in the area.
The question is what amount of heat will be lost through the attic or whether it can be neglected?

NeulingXX schrieb:

The question is: how much heat do I lose here through the thermal mass, or can I neglect it?

If the roof is the thermal envelope, then you always lose the same amount there, whether there is a screed or not.

NeulingXX schrieb:

I wanted to leave the attic floor without screed at first.
But there are too many pipes and cables lying around.

Ok, that’s something you have to decide for yourself.

NeulingXX schrieb:

The question is what heat do I lose through the attic, or can I just ignore it?

None, everything stays inside the house and isn’t "lost," since the roof is insulated.

SaniererNRW123 schrieb:

Ok, you have to decide that for yourself.

Nothing, since it all stays inside the house and won’t get "lost" because the roof is insulated.

Is it then useful to insulate under the screed?
How does the cost-benefit look?