Building biology / Healthy building / Ecological building

We had dealt with it a little.. so perlitschütt insulation, sand-lime brick or brick, clinker, copper pipes, clay or lime plaster, wooden windows, no reinforcement in the base slab (no idea if that’s possible, but it was stated in the construction service description), circuit breaker for every room, concrete roof tiles or green roof (on shed roofs), "extensive" avoidance of PVC, wooden floor coverings (optional)...

One of the basic principles of building biology is the natural regulation of humidity. In my opinion, this already excludes controlled residential ventilation.

More can be found on the website of the Building Biology Association (verband-baubiologie.de/baubiologie/grundregeln-der-baubiologie/).

How this is then implemented concretely (which building materials, which companies), that would be interesting ... ;-).

According to the page, controlled residential ventilation is not really excluded!
Quote from the page:
9. Good air quality through natural air exchange
Regular shock or cross ventilation brings fresh oxygen into buildings and reduces moisture, CO2, and other pollutants. There should always be sufficient air exchange with natural fresh air. Where manual ventilation is not possible, properly controlled ventilation systems are recommended.

Right?

Maybe this helps a little

Link deleted according to forum rules

We are with this house provider. But not because of Healthy Building, rather because we feel well taken care of by Mr. Kleinhenz and the company works very transparently.

Here a boundary is drawn between living space and outside. Interior walls are pollutant-free or low in pollutants according to today's standards, and outside it is at the discretion of the builders.

This year the old building will be demolished and the slab poured, after the winter the house is supposed to be erected. We actually wanted to move in this year already, but the demolition of the old buildings is not exactly easy.

We had been dealing with it a bit... so perlite insulation, sand-lime brick or brick, clinker, copper pipes, clay or lime plaster, wooden windows, no reinforcement in the floor slab (no idea if that’s possible, but it was stated in the construction service description), network switch for each room, concrete roof tiles or green roof (for shed roofs), “extensive” avoidance of PVC, wooden flooring (optional)...

Is this now the positive or negative list?

I wouldn't use copper pipes because an excess of copper is harmful to humans (possibly even partly responsible for Alzheimer’s). The typical multilayer composite pipes are considered harmless.

Regarding brick, sand-lime brick, PB, the building expert once had a list of what can be or is contained in bricks. To me, it rather seemed that sand-lime brick/PB are “purer.” Although you don’t have direct air contact with the stone anyway (or the EPS on the facade or the EPS under the screed -> which is practically airtight sealed).

Wooden flooring is critical if lacquered or glued. Oiled and laid as a floating floor is probably less critical. Even here I wouldn’t say that tested vinyl floors, laid as floating floors, are worse.

The same applies to wooden windows; they are not inherently better than plastic windows.

That’s why my initial question: What is REALLY medically harmful and harmless in construction. PU foam seems to belong to the REALLY bad category (even if not sprayed in large amounts and everything is supposed to dissipate after a short time). The other things, in my opinion, are only felt to be good or bad. For example, lime plaster or clay plaster is supposedly not better than gypsum plaster, or the concerns about gypsum plaster are only felt concerns and not scientifically proven (REA gypsum is even considered purer than natural gypsum).

No reinforcement in the floor slab? Maybe if you make it one meter thick? :-D

Controlled residential ventilation is of course already a huge advantage. It even filters fine dust (F7 filter - regardless of whether in the countryside or the city, a large part of PM10 and as far as I know even PM2.5 is filtered). If any substances accumulate in the house, whatever they are (radon, formaldehyde, VOCs, CO2, humidity, ...) they are filtered out so that no high concentrations occur indoors.

You write "REALLY" and very often "should". With that, you have already fully grasped the problem. There are things that, by unanimous, obvious opinion, are not good. Keyword asbestos. Although one only became wiser about that afterwards. Otherwise, it is always a matter of weighing different sources. Whom do you believe more? The scientist, the seller, the gut feeling?

Look at the problem of EPS disposal that has existed since 01.10. As if someone had voluntarily built with EPS if it had been clear that it would soon be hazardous waste. Of course, there were and are always people who grumbled that something like this would happen. But they always exist, no matter the topic. The vast majority has been building with EPS for decades and likes it. And will continue to like it, since the criticized additive has not been added since 2015. "Problem solved" – until next time.

You can build whatever you want. I think there are pros and cons for everything. Copper and Alzheimer’s was unknown to me ... only aluminum. Anyway...