External insulation: house construction with Poroton T7 MW

What are the reasons why it goes wrong? It would be interesting to know in order to take measures or to identify where my thinking error is.

In the neighboring area, neighbors have built a passive house exactly with this assembly.

Thank you very much! :)

PS: We will build with a central ventilation system.

Hello,

What are the reasons why it goes wrong? ...

Quite simple, an optimized overall design for gas condensing boilers simply does not sustainably fit a heat pump! You have to know what you ultimately want overall!
You can't have everything at nearly zero cost at the same time. That would be like the philosopher’s stone, which, as is well known, has not been found to this day! Completely logical! :-) The Nobel Prize candidate should come forward for this! :-)
Just ask the overly clever, anonymous advisors what financial liability they assume for their "advice". ;-)
In my opinion, that's where the chaff separates from the wheat suddenly quite significantly and quickly! ;-)

Best regards

That means a retrofit would actually not be possible? We build with underfloor heating, which requires a low temperature. Isn't this similar with a heat pump? Where do problems specifically occur if one decides later on for a heat pump (if it is more efficient, cheaper, and more durable) in combination with photovoltaic & storage? I personally tend to the 42 or even 49 cm stones. How does it look with that? Or are 36 cm enough? An initial calculation shows approximately 5k additional cost for each further wall thickness, i.e. 10k additional cost for the 49 cm wall.

Just as a general piece of information: insulation bricks are usually used in cases where you do not want to use additional insulation in the form of cavity insulation (for clinker facades) or ETICS (for plaster facades). Therefore, cladding a T7 wall with clinker doesn't really make much sense. Mixed facades (clinker at the bottom, plaster/wood/something else at the top) are generally always somewhat more demanding (in other words, more expensive). You should rather think about what your priorities are, and then – to respond to Euro's contribution – you do a proper basic assessment such as heating load calculation, budget, etc. If you then want a passive house, build it accordingly – or just skip it and take what you want (gas/solar thermal system). In any case, I don’t think it’s a good idea to want to keep all options open without simply making important decisions.

Best regards

K1300S

One more thing: Please do not see this as a selection of individual components that you can combine as you please. It must/should be an overall concept in which all components are coordinated with each other - otherwise the total benefit may suddenly not even be half of the individual benefits.

The plan is to build the insulation so that the Passive House standard can be achieved later. That's basically fine, right? A good insulation can’t hurt (with a good ZL), especially since it also leads to more heat storage capacity and sound insulation. The clinker is just an aesthetic matter. I don’t expect any special insulation values there. So the money goes almost 100% into the appearance.

As I understand you, you think you might as well build the Passive House right away. However, we would then have to decide on a heat pump right from the start. But I still consider it too prone to failure and without our own electricity, it doesn’t make that much sense either. That means the photovoltaic system with storage also costs quite a bit more. I would reluctantly take on another 30-45k extra, which would soon cost me nearly double again due to compound interest. I’d rather buy good (and possibly already much more mature and cheaper) technology when there’s some extra money available. Especially since prices for solar batteries, photovoltaics, and heat pumps will surely continue to fall.