ᐅ Semi-detached house – Which type is best? Does anyone have experience with this?

Hello everyone.

ypg:
What information are you missing? I’m happy to provide it.
I don’t understand the thing with the nicknames; as far as I know, I only have this one (maybe the system did something I didn’t intend?).

Here is my first question: How can you create a more sustainable Futura foundation (or from other manufacturers)? Polystyrene boards don’t seem to be the best solution, right?

In terms of concept, this would be an example of a solution I’m looking for (if the stated energy savings are accurate), but for example without plastic-based insulation boards.

Underfloor heating is no longer necessary in a passive house, but rather a luxury to have, for example, a comfortably warm floor in the bathroom.
How about repairs if something happens to the heating system?
Is it as complicated as with underfloor heating embedded in screed or more complex?

An alternative would be glass foam gravel.
However, it is not exactly cheap and therefore challenging for your budget.

I have no idea how glass foam gravel and polystyrene compare overall in the life cycle assessment from production to recycling. Neopor and similar products mainly consist of air, and the rest is fully recyclable. Glass foam gravel is made from recycled glass that is expanded.

DirkB schrieb:
How can a Futura foundation (or competitors) be built more sustainably?

Are you referring to the insulation of the slab from underneath and the sides, or to the integrated underfloor heating? The former is often used in low-energy house construction, with the sides of the slab always insulated. Using foam glass as an insulation material would reduce plastic usage somewhat. It is made from recycled glass, and the energy required for production depends on the system boundary, but in any case is 20–40% lower than for XPS.

Regarding the integrated underfloor heating in the slab, my initial impression is that it is less sustainable, although I have not looked into it in detail.

DirkB schrieb:
In terms of the topic, this would be one example of a solution I am looking for (if the stated energy savings are really accurate), but without plastic products as insulation boards, for example.

What energy savings? Compared to what?

A so-called “Swedish board” supposedly saves costs in production since you don’t need the screed anymore. However, it also has drawbacks (because ...).

Whether the insulation is placed beneath the underfloor heating but above the slab, or below the slab itself, is more a matter of preference.

If you replace XPS with foam glass boards, you end up with 30% higher costs despite the same energy efficiency.

Would such a foundation slab be feasible in a Passive House without underfloor heating? That would be ideal! Would the remaining heating demand then be covered by the ventilation system? You would definitely need one, right?

I’ve heard that a U-value (component) of 0.15 is the threshold for a real Passive House—is that correct?

A Swedish slab isn’t important; the goal is very low to no energy consumption for heating. According to Google, Foamglas isn’t much more expensive, and if I can omit screed and underfloor heating, it might actually be cheaper in the end!?

Wishing you all a pleasant evening!

As far as I know, a Passive House requires at least 0.10; with the appropriate thickness, this is also achievable with Swedish timber panels.

Swedish timber panels without underfloor heating? I've never seen that. However, I don't know many people who build new homes without underfloor heating.