ᐅ New construction with Poroton T7 MW 36.5 blocks without a mechanical ventilation system

BeHaElJa schrieb:
I’m open to being proven wrong – which construction method ensures fresh air without excessive ventilation?

There isn’t one. Fresh air requires exactly that: fresh air. In theory, ventilating about 12 times a day would be ideal, but in practice, that’s simply not feasible.

Let’s keep things reasonable. Everyone knows that this system also has its downsides (noise, mold in the ducts, costs, and so on). But it definitely has advantages as well. If you live in the countryside and enjoy fresh air, you usually have a window open somewhere for about three-quarters of the year. This is based on my experience—this is really how it is here. Plus, there’s occasional airing out of rooms—I like to lie in a bedroom with fresh air at night. Even better if I can sleep with the window open. Of course, if you live on a busy street and the noise doesn’t allow you to open a window, that’s not an option. For the winter months, I would generally choose a decentralized ventilation system in some central rooms. Is it wrong to live like that in the countryside?

I don’t have allergies.

By the way: at friends’ places, when guests are over, a ventilation system is quite useful. It ensures a steady supply of fresh air. That’s a definite plus! But even then, during barbecue evenings, the patio door is always open anyway...

Karlstraße schrieb:
Let’s keep things realistic. Everyone understands that this system also has drawbacks (noise, mold in the ducts, costs, etc.).

Costs: yes. But you should weigh that against roughly one hour of manual ventilation per day.

Noise = poor planning or incorrect installation.

Mold = no. Where would it come from? Mold requires high humidity and biomass. Both are basically absent in the ducts.

Regarding open windows: depending on the outdoor temperature, the entire room cools down. Most people generally find very cold walls uncomfortable. In addition, this greatly increases the risk of indoor mold on the walls (cold walls = low surface temperature = higher relative humidity => condensation => mold).

This basically has nothing to do with rural or urban areas. Mold does not occur less in the countryside, and you need just as much fresh air.

Sure, Grym. All buildings constructed before the invention of controlled residential ventilation didn’t work properly unless they were aired out 12 times a day, which then caused mold. I’m stepping away from this now, it’s getting too ridiculous for me.

Knallkörper schrieb:
Sure Grym. All buildings constructed before the invention of mechanical ventilation systems did not perform well unless you aired them out 12 times a day.

I believe that for at least the past decade, buildings have been truly airtight. Window installation following RAL standards.

But even before that, newly built houses no longer had the drafty windows, defects, etc., that are common in older buildings with old, rickety windows.

This airtightness is now mandatory, and there is absolutely no difference between brick, aerated concrete, or sand-lime brick with external insulation systems. The airtight layer is provided by the interior plaster (and, as far as I know, also by the exterior plaster).

Of course, things worked out somehow before. But construction technology evolves. Today, cars are built differently than 30 years ago. The Opel Kadett E was certainly a nice car, but I personally prefer an Astra K. Or a Golf 7 instead of a Golf 2. Mechanical ventilation systems with heat recovery are now standard, just like electronic stability control (ESP). We also install triple glazing instead of single glazing nowadays, and so on…

Well, if it’s now considered simply “part of it,” then it seems every manufacturer’s promotion has worked—a total deal-breaker, seriously!

Regarding rural/urban areas and noise: If I live on a busy street, possibly near a railway line, it’s noisy, and I can’t just throw open the windows. No matter how well the building is constructed. If I live somewhere in the countryside, of course I can open the windows without noise. Regardless of the building materials. And then it’s easier for me to ensure fresh air.

Finally: The estimate of one hour of work seems like a joke. But I can understand that some people just want to avoid the effort of ventilating. Still, anyone who needs an hour a day to open and close a window... sorry, I feel sorry for that person.