Evaluation of wall construction - steel frame prefab house

The grid is approximately 3m x 3m for the posts. In between, there is a skeleton made of I-beams, which holds the insulation elements. That is also currently one of my concerns, as for me, a layman, it will then act as a classic thermal bridge.
If interested: In the KabelEins media library, there is a documentary about such a house (simply search for KabelEins Containerhaus).
To be honest, I don't know if it is allowed to mention names or post links here...

Honestly, I don't know if you're allowed to mention names or post links here...

Interesting to read from someone who just agreed to the terms and conditions yesterday ;)

If interested: There is a documentary about such a house in the Kabeleins Mediathek (Just search for KabelEins Containerhaus).

I took a quick look. Reminds me of the container houses, Flyinghomes or whatever they are called. I do like them, these houses: modern, minimalist, etc., reminds me of houseboats. I think few give it much thought because a) they don't fit into the building area, b) the question is whether the climate will really be pleasant over the years. Moreover, most people already have a perceived problem with drywall.

The U-value matches the wall construction. The dew point undershoot occurs correspondingly far to the outside, so with the inner foil it is not a problem. Moisture stays inside and in gaseous form.

What is always an issue with steel constructions are temperature-related length changes along the steel beams. However, I don’t know how much this actually matters for the length/height of a single-family house. Radio and mobile phone networks will presumably be reliably shielded, but that is more of an advantage than a disadvantage. Otherwise, I can’t think of anything else on this.

What I wonder is why it should be cheaper. The wall construction in terms of insulation materials is certainly not cheaper than the classic timber frame construction. Metal construction in general is also more expensive (at least I would assume) compared to the carpenter-style manufacture of prefabricated timber frame walls.

In between, there is a skeleton made of beam sections that holds the insulation elements. This is also one of my concerns, as a layperson, because I think it will act as a classic thermal bridge.

This concern should already be addressed by the fact that Kfw40 actually does not allow many thermal bridges.

As I said, we were in a bungalow where we could not detect anything unusual. The goal is still a prompt inspection of a two-story single-family house.

But the manufacturer should be able to provide results/calculations regarding sound insulation. That is something that is often not subjectively noticeable during showings (unless it is really bad). There is not much mass in the wall construction. In addition, the steel skeleton is somehow connected.

Of course, it also depends on your location, i.e., what kind of noise exposure prevails.

Do you have information regarding the interior wall construction?

Interesting to read from someone who only just agreed to the terms and conditions yesterday

Yes, I still had in mind that there was something about prohibited links :D

The U-value matches the wall structure. The dew point drops correspondingly far to the outside, so with the inner foil it is no problem. Moisture stays inside and gaseous.

Thank you very much for the assessment, that definitely helps to dispel these concerns.

What I wonder is why it should be cheaper. The wall construction in terms of insulation materials is certainly not cheaper than classic timber frame construction. Metal construction in general is also more expensive (at least I would assume) compared to the carpentry production of prefabricated timber frame walls.

I think the costs are mainly saved by the production location in Bulgaria. In our specific case, the self-supporting construction also allows the omission of a slab foundation, which saves a lot of money with the deep foundation. That’s why we even came up with the idea. In combination with the lower investment costs for the heating system, these might be exactly the scale of savings that enable us to realize the project.

Our budget is very limited due to the expensive plot and the complex foundation. The location, however, is exceptional. Therefore, we are currently trying to find out whether we can somehow realize a single-family house there which might be very simple in terms of standard, but still sufficient in the quality of the building substance. An alternative would probably be a prefab house from Danwood or similar. It has to measure up against that.

But the manufacturer should be able to provide results/calculations regarding sound insulation. That’s something that is usually not at all perceivable subjectively in daylight conditions (unless it’s really bad). There is not much mass in the wall construction. Also, the steel frame is somehow connected.

Of course, it also depends on your location. So, what kind of noise exposure prevails.

Do you have info regarding the interior wall construction?

I don’t have the interior wall construction yet. That would now be part of the next coordination round. Sound insulation to the outside is less relevant for us, as long as it is not completely bad, since it will be located on a quiet dead-end street with few residents. Impact sound is important to me. We therefore want to experience this in another customer house.

Containerhaus

Ah, so that's where the wind is coming from. The construction already seemed odd to me, but that obviously explains it.

The manufacturer's data for the Con(tainer)house reads reasonable from an energy standpoint. The wall construction is unusual, but not critical. All materials used are vapor impermeable, and the zinc sheet surfaces are ventilated, so if any condensation occurs somewhere, it can drain away.
The installed reflective foil – well, it doesn't make things worse, and there is enough insulation anyway.

The floor construction is somewhat unusual: covering (parquet) directly on XPS is susceptible to point loads. Better (maybe also installed?) would be cement- and fiberglass-coated XPS boards (WEDI, Jackodur, etc.).

An additional pitched roof or something else to drain water certainly doesn't hurt. A steel roof as a flat roof will eventually fail even with the thickest coating.