Hello, I am new here, so please excuse my lack of knowledge. I also tried to use the search function, but it always shows me errors. Now to my questions. We recently purchased a plot of land and are now looking for the right house for us. We often hear about KfW standards 😉. So far, we have looked into the 70 series, but I have some concerns about the ventilation system. My question is, do you also need a ventilation system for a KfW 100 house, or is it recommended? I haven’t been able to find any information about this online. The last person I asked either couldn’t or didn’t want to explain the difference in requirements. Additionally, a wooden house would also be an option for us, which could later be clad with brick or stone. What building standard would such a house meet? Is it possible to make a general statement? I assume KfW 100 would definitely be fulfilled. Thanks in advance.
I
Irgendwoabaier9 Feb 2014 23:15Hello,
so:
What does a ventilation system have to do with KfW 70? Nothing.
What does a ventilation system have to do with comfort? You can also create a good indoor climate in other ways—possibly by ventilating the entire house very frequently. Is that comfortable? The consequence of insufficient ventilation is often mold.
What speaks against a ventilation system? From my point of view: the cost. But for me, the ventilation issue would really become a problem without a ventilation system.
Regarding timber houses with brick cladding – that can mean anything and everything. You definitely can’t make a general statement because timber houses vary so much from one to another.
so:
What does a ventilation system have to do with KfW 70? Nothing.
What does a ventilation system have to do with comfort? You can also create a good indoor climate in other ways—possibly by ventilating the entire house very frequently. Is that comfortable? The consequence of insufficient ventilation is often mold.
What speaks against a ventilation system? From my point of view: the cost. But for me, the ventilation issue would really become a problem without a ventilation system.
Regarding timber houses with brick cladding – that can mean anything and everything. You definitely can’t make a general statement because timber houses vary so much from one to another.
Well, with an (additional) ventilation system, achieving KfW 70 standards is possible.
A ventilation system also helps your airtight building to “breathe,” which prevents mold growth.
But does KfW 100 still exist?
Nowadays, you have to build with renewable energy sources, and even higher standards will be coming soon!
By “wood house with cladding,” you probably mean timber frame construction... a Finnish wood house is not clad like that.
No, you can’t make such a general statement (referring to your question); it all depends on the insulation!
Note: This is a non-expert opinion. Best regards!
A ventilation system also helps your airtight building to “breathe,” which prevents mold growth.
But does KfW 100 still exist?
Nowadays, you have to build with renewable energy sources, and even higher standards will be coming soon!
By “wood house with cladding,” you probably mean timber frame construction... a Finnish wood house is not clad like that.
No, you can’t make such a general statement (referring to your question); it all depends on the insulation!
Note: This is a non-expert opinion. Best regards!
D
Doc.Schnaggls10 Feb 2014 08:58Hello,
I share the same view as Mycraft. In a new build, I would never do without a central ventilation system with both supply and exhaust air.
The increased comfort alone—never having to manually ventilate again—is worth the extra cost to me. But the reliable removal of humid air and, above all, the partial recovery of heat from the exhaust air should not be overlooked either.
Regards,
Dirk
I share the same view as Mycraft. In a new build, I would never do without a central ventilation system with both supply and exhaust air.
The increased comfort alone—never having to manually ventilate again—is worth the extra cost to me. But the reliable removal of humid air and, above all, the partial recovery of heat from the exhaust air should not be overlooked either.
Regards,
Dirk
B
Bauexperte10 Feb 2014 10:53Hello,
You don’t strictly "need" a ventilation system if you rely on renewable energy; with a conventional gas condensing boiler, it mainly depends on the orientation of the plot to the sun. Sometimes it works "on paper" without one, but mostly not. Whether skipping a ventilation system makes sense or just reflects the disadvantage you seem to associate with its installation can certainly be answered by using the search function here; you have already received some initial assessments.
Best regards, Bauexperte
DJM schrieb:If you want to take advantage of KfW subsidies, you can't avoid a KfW 70 efficiency house. Personally, I wouldn't recommend it to anyone regardless of subsidized loans. It’s always important to look to the future and keep a possible later sale of the property in mind—not to mention the potential savings on energy costs.
We recently purchased a plot of land and are now looking for the right house for us. Everyone keeps talking about KfW 😉. So far, we have been researching the 70-series houses, but I have some concerns about the ventilation system. Now my question is: is a ventilation system also necessary or recommended for a 100-series house?
You don’t strictly "need" a ventilation system if you rely on renewable energy; with a conventional gas condensing boiler, it mainly depends on the orientation of the plot to the sun. Sometimes it works "on paper" without one, but mostly not. Whether skipping a ventilation system makes sense or just reflects the disadvantage you seem to associate with its installation can certainly be answered by using the search function here; you have already received some initial assessments.
DJM schrieb:Take a look at the KfW websites; they explain the requirements for the different efficiency classes in a way that is easy to understand for non-experts.
I couldn’t find anything about this on the internet so far. And the last person I asked couldn’t or wouldn’t explain the difference in the requirements to me.
DJM schrieb:Who comes up with the idea to clad a wooden house with bricks, and why?
Also, a wooden house would be an option for us, which could be clad with bricks afterwards.
Best regards, Bauexperte
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