ᐅ New Single-Family House Construction (KFW70) / Aerated Concrete vs. Sand-Lime Brick / Which Material to Choose?

Created on: 31 Jan 2014 08:27
L
Lacos
Hi everyone,

We are planning to build with a general contractor and have collected some offers. Some use aerated concrete, others use calcium silicate bricks. Some combine the two, using aerated concrete for the exterior walls and calcium silicate bricks on the inside.

What would you recommend? Is this combination of aerated concrete on the outside and calcium silicate bricks on the inside common and preferable?
Should we be concerned about cracks due to the different expansion properties of the two materials, or is this not an issue with proper construction?

What would you currently choose to build with or have built—what is your preferred building material?

Thank you in advance,
Lacos
B
Bauexperte
11 Feb 2014 10:07
Hello €uro,

I fear that your reputation in this forum will suffer long-term if you continue to attack others like this.
€uro schrieb:

Wrong assumption, of course, like any self-employed person, I am interested in acquiring clients. Or do you really believe that, for example, Bauexperte is just a miracle worker?
We both approach the topic of HBF with completely different expectations. At no point did I assume that I would generate contracts based on my posts here. Accordingly, you will find no client acquisition from me. Of course – and this is also true – I do not turn down inquiries from the forum; however, I do not push myself forward. Anyone who wants my services will find their way to me.
€uro schrieb:

When professionals participate in forums, it certainly always also has to do with client acquisition; anything else would be completely unrealistic.
Well, then I must be unrealistic.

I primarily registered here to provide practical information for potential homeowners. The goal is to bring the balance of truth and fiction in at least some future conversations between homeowners and sellers to a tolerable level. More specifically, I hope to make my work easier in upcoming discussions and, to the same extent, make things more difficult for the bad actors in our industry. I experienced this success again just last night when I accompanied my partner to a consultation. Sitting across from us were well-informed people; by no means as clueless as often happens when laypeople meet sellers. I was genuinely pleased that they had gathered information from my posts as well. But to conclude from this that the construction contract is just waiting in my partner’s pocket, or that my (Bauexperte’s) participation in the HBF would boost the contract, is not only grossly negligent but also foolish! It takes more than writing easily understandable posts.
€uro schrieb:

Anyone who truly understands a bit about the overall business will hardly bother with forums.
Unfortunately, very few people look beyond their own horizon! Otherwise, the forum would be flooded with professionals.
I have always regretted this, as it would only benefit the – in my opinion, mistaken – reputation of our industry with the general public.

Best regards, Bauexperte
€uro
11 Feb 2014 14:11
Perlenmann schrieb:
....Where are your helpful answers?...
Some probably understood them, but apparently you did not
Perlenmann schrieb:
....Instead, I have to be called an “anonymous advisor”....
What else would you be? No training in any field where you present yourself as an advisor!
Perlenmann schrieb:
...So ANONYMOUS ADVISORS share their experiences, of course without liability....
Exactly, since such advice usually cannot be transferred without comment and is therefore not professionally reliable – mostly worthless!

Best regards
€uro
11 Feb 2014 14:24
Hello building expert,
Bauexpert schrieb:
...I fear your reputation in this forum will suffer permanently if you keep striking out like this...
I have absolutely no problem with that! Anyone who cannot handle the truth should simply ignore it to their own detriment! Those with sense are increasingly reaching out to me. I gladly leave the rest to anonymous advisors.
Bauexpert schrieb:
...I don’t reject requests from the forum; however, I don’t push myself forward. Anyone who wants my services will find their way to me...
Same goes for me!

Best regards
B
Bauexperte
11 Feb 2014 17:18
Hello €uro,
€uro schrieb:

I have absolutely no problem with that!
I am increasingly concerned about this. The admin has given you a lot of freedom so far (your signature/graphics with your advertising), but on the other hand, you clearly communicate that your priority is not to participate in the forum with a spirit of helping others, but solely to gain profit from your participation here. From my perspective, it is understandable that users feel disappointed. Overall, in my opinion, this does not correspond well. Taking usually also requires giving.
€uro schrieb:

I have absolutely no problem with that! Those who cannot handle the truth should simply ignore it to their own disadvantage! Those with common sense do contact me increasingly. I gladly leave the rest to anonymous advisors.
This is not about you as a contractor! Although I am convinced that with a little effort on your part, your inbox would probably be overflowing.

The purpose of this forum is the "free of charge" exchange of experience – of course, within reasonable limits for everyone. I think you could focus a bit more on sharing your professional experience in a way that the average layperson understands. At the moment, you tend to be rather harsh, and I do not like that at all.

Regards, Bauexperte
E
Explosiv
11 Feb 2014 18:01
Michalko schrieb:
I believe you might not be fully aware of some things.
A heat pump is significantly more robust and requires considerably less maintenance than a gas condensing boiler with a solar thermal system.
Think about how often a refrigerator breaks down and how often it is maintained.
In my opinion, heat pumps are the only way to stop using fossil fuels in the future, and that requires a well-insulated building combined with an efficient heating system with low energy demand. Currently, heat pumps are simply state of the art because no other heating system can achieve such efficiency at “low” investment costs.

Hi,
I work in mining and am familiar with ventilation cooling machines in the 1 MW range. Surely those are robust. But does that also apply to an air-source heat pump with a fan in the garden?
My inexpensive gas condensing boiler from Sieger, which I installed over 10 years ago, has only needed a new sacrificial anode so far. Basic maintenance can also be done by myself. The refrigerator of similar age has only needed a new thermostat during that time.
I have nothing against heat pumps and might switch eventually in the long term. But definitely not to an air-source heat pump. The calculation for the optimal annual performance factor barely adds up, and how often does that optimal condition occur in real life?
And the investment costs for other types of heat pumps are often too high during the phase when you are building a house.
Also, don’t forget that with a heat pump you are using electricity, the most valuable form of energy.
E
Explosiv
11 Feb 2014 19:42
Perlenmann schrieb:

The additional cost FOR ME from an air-source heat pump to a ground-source heat pump was 5000€ for 2x 60m (200 feet) probes. I didn’t have to think long about that!

Hi
For 5000 EUR saved now, in 20 to 30 years I’ll probably buy two new gas condensing boilers to replace the ones that have broken down by then. And whether the 5000 EUR will be recovered through savings over that time is questionable.
Perlenmann schrieb:

What you mean by the most valuable form of energy, I have no idea?! I think electrical energy will be the simplest form of energy in the future!

On the contrary. Electrical energy is physically the most valuable, while heat as the end product of all efforts is the least valuable. You can do a lot with electrical energy with little effort, such as producing light, motion, or if necessary, heat. But heat itself is only useful for warming something up. To convert heat into other forms of energy requires complex processes with generally poor efficiency.

Actually, I’m hoping that in 20-30 years small combined heat and power units will be so advanced and affordable that private homeowners can use them effectively in their homes. About the size of a refrigerator or a typical boiler. Let’s see what the future holds.