ᐅ New construction with Poroton T7 MW 36.5 blocks without a mechanical ventilation system
Created on: 12 Aug 2016 18:00
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Goldi09111
Hello everyone,
what do you think, is it necessary to include a mechanical ventilation system with heat recovery in a single-family house (140-160m2 (1506-1722 sq ft)) built with T7 bricks?
According to a construction company, they install this only about once every two years, and then only at the homeowner’s request.
I could imagine that with bricks, the wall can "breathe" to some extent and better regulate the relative humidity.
Thanks for your advice.
what do you think, is it necessary to include a mechanical ventilation system with heat recovery in a single-family house (140-160m2 (1506-1722 sq ft)) built with T7 bricks?
According to a construction company, they install this only about once every two years, and then only at the homeowner’s request.
I could imagine that with bricks, the wall can "breathe" to some extent and better regulate the relative humidity.
Thanks for your advice.
B
Bauexperte12 Aug 2016 22:35Goldi09111 schrieb:
I’m saying this because I am currently getting to know many homeowners. You are, after all, a smart guy based on your training, right...?
**Just through concrete, mortar, plaster, and screed, between 10,000 and 20,000 liters (2,641 to 5,283 gallons) of water are introduced into a single-family house. That water needs to be removed, otherwise it becomes a problem. The solution in new construction is therefore primarily systematic ventilation and drying – ideally during the first four years after building.**
I took the liberty of citing the source since I am often accused of bias.
If you can only ventilate properly once a day, a mechanical ventilation system with heat recovery is essential—depending on the energy standard you aim to meet (e.g., KfW standard). Such systems do not replace the necessary window ventilation one-to-one, depending on the outdoor temperature, but they significantly help to remove moisture from inside the house.
From my perspective, the issue with mechanical ventilation is less about payback and more about a necessary measure in today’s highly insulated buildings.
**Source: Zuhause wohnen**
Hello,
I have always seen it the same way as Bauexperte and Ypg, and it still makes sense to me. However, when talking to different construction companies, I completely agree with Goldi09111. Apart from prefab houses with a vapor barrier, this doesn’t seem to be a major issue at the moment, which does make you think...
So here’s the question to the group:
- Why is that? Is it simply the extra investment that most homeowners want to avoid, or is it not as serious as sometimes claimed? After all, there is no real vapor barrier, so the house could at least breathe a little, right?
- What would a proper mechanical ventilation system with heat recovery cost for about 170 sqm (1,830 sq ft) of living space? Also, are there any recommendations or things to watch out for?
I have always seen it the same way as Bauexperte and Ypg, and it still makes sense to me. However, when talking to different construction companies, I completely agree with Goldi09111. Apart from prefab houses with a vapor barrier, this doesn’t seem to be a major issue at the moment, which does make you think...
So here’s the question to the group:
- Why is that? Is it simply the extra investment that most homeowners want to avoid, or is it not as serious as sometimes claimed? After all, there is no real vapor barrier, so the house could at least breathe a little, right?
- What would a proper mechanical ventilation system with heat recovery cost for about 170 sqm (1,830 sq ft) of living space? Also, are there any recommendations or things to watch out for?
B
Bauexperte13 Aug 2016 09:33Stewi schrieb:
- What is the reason for this? Is it simply the additional investment most homeowners want to avoid, or is the problem not as severe as some claim?It is assumed that every second new building is affected by mold. So, I would guess it is a combination of two factors: builders do not want to make their houses even more expensive, and homeowners skip this sensible investment because they tend to believe statements like "you don’t need that."Stewi schrieb:
- How much would a proper controlled ventilation system with heat recovery cost for a house of about 170 sqm (1,830 sqft)?Approximately starting from 12,000 euros (about 12,000 USD) and up, depending on the provider and including installation.Regards, Bauexperte
G
Goldi0911113 Aug 2016 11:58I think it would make more sense to invest the 12k now rather than realize after three years that the living quality has been "ruined" because there isn’t enough ventilation.
Well, let’s see what the ventilation system specialist offers us.
Well, let’s see what the ventilation system specialist offers us.
I am also in favor of a mechanical ventilation system with heat recovery. It prevents mold (and if you ever get mold, you’ll be willing to pay a lot to get rid of it), and the air always smells fresh (even in the bedroom in the morning, or after big gatherings, bathroom ventilation, etc.). I would have installed one myself if it had been recognized as an official “measure.”
Today, controlled residential ventilation is essential.
Houses built nowadays are so airtight that no natural air exchange takes place. The idea of a „breathing house“ is simply a myth. There are building materials and bricks that can regulate some moisture—they absorb moisture when indoor humidity is high and release it when it drops. However, humidity can only decrease if the air is exchanged. If the indoor air is not replaced, the humidity level continuously rises because no air exchange occurs. Eventually, this leads to mold growth.
That’s why it is always necessary to plan for controlled residential ventilation today. If you want to reduce the investment costs, you can consider a decentralized system with heat recovery. It is less expensive but somewhat less efficient.
In my case, I have a central system with ducts installed in the ceiling.
Houses built nowadays are so airtight that no natural air exchange takes place. The idea of a „breathing house“ is simply a myth. There are building materials and bricks that can regulate some moisture—they absorb moisture when indoor humidity is high and release it when it drops. However, humidity can only decrease if the air is exchanged. If the indoor air is not replaced, the humidity level continuously rises because no air exchange occurs. Eventually, this leads to mold growth.
That’s why it is always necessary to plan for controlled residential ventilation today. If you want to reduce the investment costs, you can consider a decentralized system with heat recovery. It is less expensive but somewhat less efficient.
In my case, I have a central system with ducts installed in the ceiling.
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