ᐅ Full-rafter insulation for roofs or insulation on concrete slabs

exto1791 schrieb:

Insulation on the concrete ceiling instead of full rafter insulation – here is the response from my general contractor on this topic:
To be honest, I’m not really enthusiastic about it.
The attic space then becomes an unheated area, which limits its use as storage.
If warmer air from inside passes through the ceiling opening into the attic during winter and meets the cold air near the underside of the roof, condensation will form at that spot.
What do you think? Is he right?

This will definitely be a topic for us as well. If the price is the same or the wooden beam solution is even cheaper, we will definitely prefer that.
We have had good experiences with insulation between rafters in terms of thermal performance, so… “never change a running system,” even if others might see it differently.
Currently, we also benefit from this solution because we have been able to easily adjust lighting, add outlets, and all that can be done simply – including installing lamps and fixtures; this would be difficult or even impossible with a concrete ceiling.
To what extent you add insulation between the beams of the floor structure or make it walkable with OSB boards or similar materials, you can still decide later.
For me, a concrete ceiling between the upper floor and the attic would feel more like a disadvantage, even if I were "given" the possibly more expensive concrete ceiling for free.

Exactly. Unnecessary.

pagoni2020 schrieb:

This will definitely be a topic for us as well. If the price is the same or even cheaper for the wood beam solution, we will definitely prefer it.
With insulation between the rafters, we’ve had good experiences with heat retention so far, so… "never change a running system," although others might see it differently.
Currently, we also benefit from this solution because we have easily been able to adjust lighting in various places, add additional outlets, and all of this can be done simply, including the installation of lamps, built-in components, etc.; all of these would be difficult or impossible with a concrete ceiling.
To what extent you add insulation between the beams of the floor above and/or make it walkable with OSB or similar is something you can still decide later.
For me, having a concrete ceiling between the upper floor and the attic would feel more like a disadvantage, even if I were given the possibly more expensive concrete ceiling for free.

Once everything is finished, it’s a huge advantage. At least for me personally. It supports everywhere and holds everything. It works great against summer heat. It was very easy to insulate. I don’t personally experience any disadvantages from it. Necessary? No. An advantage for me? Yes.

Joedreck schrieb:

When everything is finished, it’s a huge advantage.

What exactly do you mean by that, or which solution is the advantage, or what are the benefits?
I am still BEFORE the decision, so I am interested in different perspectives.

So, I have a concrete ceiling. The truth is: it’s complex during the planning stage and difficult to retrofit, for example when installing spotlights. Afterwards: for me, it’s great. It provides excellent heat protection and is very easy to insulate (if it’s not accessible). These are clear advantages for me.

Is it worthwhile to add insulation between the rafters later on, in addition to the existing ceiling insulation on the upper floor? This would solve the cold air space issue in the attic during winter, wouldn’t it?