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:
Central systems are the worst. Complicated planning. Extremely expensive. The ventilation openings ruin the look completely. The ducts become breeding grounds for germs and bacteria after a short time. Plus, the filters are costly. Noisy airflow at the outlet vents. Sound transmission, so you can hear what’s being said on the ground floor up in the attic. Visually awful when installed on the ceiling.
This just has to be said to prevent new homeowners from choosing such nonsense. It only causes problems. Yet it’s praised to the skies so the house doesn’t start to mold under you, since everything is built airtight.
I am familiar with both systems. Both work quite well comparatively. In new builds, I would install a central system if the budget allows, decentralized if the budget is limited, and also decentralized for renovations.
Okay, enough off-topic. Back to the subject.Now you’re talking nonsense like a blind person talking about color… have you ever owned a central system??? What you’re saying simply isn’t true.I’ve rarely heard such rubbish… about hearing noise from room to room, then you’re doing something wrong, and there’s no dirt after 2 years.
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nordanney18 Feb 2021 17:46Snowy36 schrieb:
What you’re saying is simply not true.You missed the emoji. That was my reply to @Bookstar. Maybe I should have added irony. I know both the RL50 RAS and Vallox central ventilation systems firsthand from my own houses.
Snowy36 schrieb:
What you’re saying just isn’t true. That wouldn’t be unusual for a casual chat—and that’s basically what this is about. Regarding the original question in the title, it’s hardly relevant at this point since the original poster obviously has more fundamental “problems” than whether the wall ends up 6cm (2.4 inches) thicker or not. So we might as well switch topics freely and talk about controlled residential ventilation with as much subjective opinion and lack of expertise as football. Ha, ho, he, Herta BSC—I’m actually a fan of the Hamborner Löwen (which isn’t primarily about football, but about Küppersbusch).
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