Hello,
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
T
Traumfaenger29 Apr 2017 23:49Grym schrieb:
Traumfaenger, please make sure to inform yourself properly... Cleaning systems have been available for over a decade... Alternative facts à la Trump? Honestly, such naivety is frustrating...Grym schrieb:
I prefer to inform myself a bit before following the opinion of a single, highly controversial person.Hello Grym, thank you for taking the time to reply again. If I follow your logic, anything that has been on the market for more than a decade is proven and free of flaws? Well then, I conclude that since nuclear power plants have existed for over 60 years, the increased cancer rates around the Krümmel nuclear plant (for 25 years) cannot possibly be attributed to nuclear power? So anything not identified as harmful within the first 10 years is not harmful at all? Grünenthal & Co. will be very pleased by that.
My suggestion: Enjoy your mechanical ventilation with heat recovery and the fresh air in your home. I just wanted to give other forum members who have not yet spent over 10,000 EUR on such a system a point to consider. They can take it into account freely and democratically or not. This was not intended to offend those who have chosen to install such a system in the past, nor is it a deal breaker to include one.
T
Traumfaenger30 Apr 2017 00:22Hmm... Your words confuse me, but you are certainly right. In this sense, "Your will be done, on earth as it is in heaven." Who could still doubt your truths???
B
bierkuh8330 Apr 2017 00:57Grym schrieb:
It’s not certain, but the chances are much higher. And if you barely avoid mold with ventilating twice a day, that’s okay. Have you checked behind all the furniture and inspected the corners? No, not barely, but not at all, absolutely not. Come on, better take a look under your hat and see if you don’t find some mold there.Grym schrieb:
We once visited a private home of a house seller who ventilated 2-3 times a day, always using the range hood with exhaust, and still had mold issues. It’s a bit of a gamble; everyone has to decide for themselves how they want to handle it. So, the famous isolated case that is supposed to serve as proof. Maybe he didn’t ventilate at all or had another source of excess moisture? Who knows. Certainly not you.Grym schrieb:
And of course nowadays every expert basically advises controlled mechanical ventilation. Architects, engineers, energy consultants. Controlled mechanical ventilation is still frequently omitted mainly for cost reasons. So, EVERYONE. So you know the opinion of all experts. Amazing. I’m getting tired of this. It’s like arguing with believers...
Don’t get me wrong, controlled mechanical ventilation is okay. Just not a must...
Your comments are at the level of "walls breathe," and I don’t have the time or patience right now to explain this primitive concept to you.
There are pros and cons, but what you’re saying is nonsense. Certainly, a mechanical ventilation system with heat recovery costs a lot of money, and building a house always involves compromises. You have to weigh that for yourself. The risk of mold in an airtight house is always present. Cleaning—if it’s necessary at all—is easy with such a ventilation system. You can do it every 10 years for peace of mind. As long as the filter (also use exhaust air filters!) is replaced quarterly and the system runs 24/7, the air inside the ducts is basically cleanroom quality. This applies even to kitchen exhaust!
The buildup of CO2, formaldehyde, VOCs, and so on in unventilated rooms becomes noticeable after just 2 hours without ventilation. Likewise, mechanical ventilation filters fine dust particles from outdoor air.
There are pros and cons, but what you’re saying is nonsense. Certainly, a mechanical ventilation system with heat recovery costs a lot of money, and building a house always involves compromises. You have to weigh that for yourself. The risk of mold in an airtight house is always present. Cleaning—if it’s necessary at all—is easy with such a ventilation system. You can do it every 10 years for peace of mind. As long as the filter (also use exhaust air filters!) is replaced quarterly and the system runs 24/7, the air inside the ducts is basically cleanroom quality. This applies even to kitchen exhaust!
The buildup of CO2, formaldehyde, VOCs, and so on in unventilated rooms becomes noticeable after just 2 hours without ventilation. Likewise, mechanical ventilation filters fine dust particles from outdoor air.
cobra1982 schrieb:
What exactly do KfW 55 and 70 mean, and is it mandatory?(The "mandatory" aspect has already been explained.)
KfW stands for "Kreditanstalt für Wiederaufbau" (Reconstruction Credit Institute), originally established after World War II in connection with the Marshall Plan. The numbers "70," "55," and "40" represent percentages of a previous energy consumption value, which serves as the baseline index of 100. These three levels correspond to increasing energy savings, with greater savings qualifying for higher funding support. KfW 70 means a 30% reduction in energy consumption (i.e., consumption reduced to 70% of the baseline). To my knowledge, this level is no longer funded because the Energy Saving Ordinance (Energieeinsparverordnung) already requires compliance at that standard. KfW 40 achieves a 60% reduction (consumption lowered to 40%). The balance between the effort required to reach the target and the funding that makes homeownership more affordable tends to favor KfW 55, so significantly more products and solutions are designed to meet KfW 55 standards than KfW 40. As mentioned, KfW 70 has become largely unattractive or outdated.
In simplified terms, the KfW acts as a federal development bank for funding programs.
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Grym schrieb:
There is always a risk of mold in an airtight house.Ah, at least that much is agreed upon.
Grym schrieb:
The concentration of CO2, formaldehyde, VOCs, etc., in unventilated rooms becomes significant after just 2 hours without airing. Also, controlled mechanical ventilation filters out fine dust from the outside air.Grym schrieb:
That is absolute overkill, but for some people, this technical automation is a hobby.Blind control of blinds, please without technical complications, but it is helpful when replacing traditional window ventilation. I don’t need to understand everything.
Grym schrieb:
Cleaning, if even necessary, is easy with controlled mechanical ventilation. You can do it every 10 years for peace of mind. Provided the filter (use exhaust filters too!) is changed quarterly and the system runs 24/7, the air inside the ducts is essentially cleanroom quality.I clean my windows much more often than every ten years, and a fly screen in midsummer is enough air filtration for me.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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