ᐅ Poroton 36.5 or 42.5 with perlite or mineral wool insulation
Created on: 17 Feb 2021 14:00
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Freiburger2020
Hello everyone,
we are uncertain whether to go with a monolithic KfW40 or just KfW55 standard.
That means choosing between the Poroton T7 36.5cm (14.4 inches) or the 42.5cm (16.7 inches) insulated brick.
We are also undecided between using perlite or mineral wool insulation. I hope to get some input based on experience. The building contractor is not giving clear advice, with different opinions on which is better or worse.
Since we are building two residential units, we will receive double KfW subsidies, so the repayment grant is a strong argument in favor of KfW40 and the 42.5cm (16.7 inches) brick.
On the other hand, there is the actual loss of space with the 42.5cm (16.7 inches) brick compared to the 36.5cm (14.4 inches) one, and the fear that heating costs with the 36.5cm (14.4 inches) brick might become overwhelming after a few years.
We definitely want a solar system, which again supports going for the KfW40+ standard and the 42.5cm (16.7 inches) brick.
We look forward to your opinions.
we are uncertain whether to go with a monolithic KfW40 or just KfW55 standard.
That means choosing between the Poroton T7 36.5cm (14.4 inches) or the 42.5cm (16.7 inches) insulated brick.
We are also undecided between using perlite or mineral wool insulation. I hope to get some input based on experience. The building contractor is not giving clear advice, with different opinions on which is better or worse.
Since we are building two residential units, we will receive double KfW subsidies, so the repayment grant is a strong argument in favor of KfW40 and the 42.5cm (16.7 inches) brick.
On the other hand, there is the actual loss of space with the 42.5cm (16.7 inches) brick compared to the 36.5cm (14.4 inches) one, and the fear that heating costs with the 36.5cm (14.4 inches) brick might become overwhelming after a few years.
We definitely want a solar system, which again supports going for the KfW40+ standard and the 42.5cm (16.7 inches) brick.
We look forward to your opinions.
nordanney schrieb:
That’s what your gut says, not your mind 😉.
I would rather skip another minor feature and install a decentralized ventilation system. 350€ per unit and only one power cable plus core drilling. That should always be part of a new build.But decentralized ventilation is really a major compromise, completely unsuitable for a single-family house. Okay, maybe for the bathroom, but otherwise? These units get dirty, are noisy, not very attractive inside or out, heat exchangers are ineffective (in winter you get cold drafts), and the air exchange doesn’t work properly. Also, they cannot be centrally controlled. As I said, it’s really a poor solution—better to install nothing and save the money!N
nordanney17 Feb 2021 16:06Bookstar schrieb:
But decentralized ventilation is really a poor solution, completely unsuitable for a single-family house. OK for the bathroom, but otherwise? These units get dirty, are noisy, not very attractive inside or out, heat exchangers are ineffective (you feel cold drafts in winter), and the air exchange doesn’t work properly. Also, they can’t be controlled centrally. As I said, they’re a real hassle—better to install nothing and save money! ???
Then you’ve never seen, heard, or used such a device. I can’t agree with any of your points (design is subjective). They don’t get dirtier than centralized systems—just at more locations. The heat exchangers are very effective, there are no drafts, the air exchange works well and is adjustable. Central control is even possible, including integration with a pressure sensor for the chimney.
I had it for years, and this is my experience. I also know people who barely tolerate it because it’s simply bad. Our systems were from Meltem. Lunos is said to be even worse. I believe that people with decentralized systems have probably never experienced a central unit. Apart from the price advantage, decentralized systems really only have disadvantages.
For single-family homes, this is no longer state of the art; such systems are now almost exclusively installed in multi-family buildings.
Oh, and the unit can’t be quiet either—I mean, the fan is installed directly in the wall next to you? How ridiculous is that? It’s obvious that this has to be a poor solution.
Then the units get dirty inside, outside, and on the casing—it’s really crazy. You don’t have this problem with a central unit. In every room, there are holes, and when it’s windy, you get whistling sounds, and so on.
For single-family homes, this is no longer state of the art; such systems are now almost exclusively installed in multi-family buildings.
Oh, and the unit can’t be quiet either—I mean, the fan is installed directly in the wall next to you? How ridiculous is that? It’s obvious that this has to be a poor solution.
Then the units get dirty inside, outside, and on the casing—it’s really crazy. You don’t have this problem with a central unit. In every room, there are holes, and when it’s windy, you get whistling sounds, and so on.
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Freiburger202017 Feb 2021 16:25I now have a central ventilation system, which is also planned twice in the new project. Decentralized systems are not an option for me.
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