ᐅ Insulating a New Build with 36.5 cm Aerated Concrete Blocks?
Created on: 17 Jan 2014 14:00
B
bygoran
Hello
our new build starts on Monday.
I am considering insulating the 36.5cm (14.4 inches) aerated concrete wall right away while the scaffolding is still in place.
We are building without KfW funding but want to insulate as well as possible.
According to a U-value calculator, I need 200mm (8 inches) of insulation to avoid moisture problems. Is that correct?
Can someone provide more detailed information? Or calculate exactly how thick the insulation needs to be to avoid any issues.
A controlled mechanical ventilation system with heat recovery is also planned.
The last ceiling below the cold roof is made of 24cm (9.5 inches) concrete, and I plan to add 240mm (9.4 inches) mineral wool insulation with a thermal conductivity of 0.035 W/(m·K). Is that sufficient?
I would appreciate any information.
our new build starts on Monday.
I am considering insulating the 36.5cm (14.4 inches) aerated concrete wall right away while the scaffolding is still in place.
We are building without KfW funding but want to insulate as well as possible.
According to a U-value calculator, I need 200mm (8 inches) of insulation to avoid moisture problems. Is that correct?
Can someone provide more detailed information? Or calculate exactly how thick the insulation needs to be to avoid any issues.
A controlled mechanical ventilation system with heat recovery is also planned.
The last ceiling below the cold roof is made of 24cm (9.5 inches) concrete, and I plan to add 240mm (9.4 inches) mineral wool insulation with a thermal conductivity of 0.035 W/(m·K). Is that sufficient?
I would appreciate any information.
Dear Sir or Madam,
My building project has now become quite concrete.
I just visited the energy consultant at the consumer advice center (1 hour = 10€).
He noticed the following:
The exterior wall consists of aerated concrete blocks (PPL 2), thickness = 24cm (10 inches), and an external thermal insulation composite system (ETICS) with a thickness of 14cm (6 inches).
He said that it would be possible to save a significant amount of money while maintaining the same insulation value by using a 36.5cm (14 inches) block instead of the 24cm (10 inches) aerated concrete block. The mason does not receive a higher hourly wage, and the larger block is generally preferred and, above all, faster to install (apparently it is done using a crane).
According to this, my €21,000 for exterior plaster including ETICS could be reduced to around €10,000. The 36.5cm (14 inches) aerated concrete block costs only €3.40 more per cubic meter compared to the 24cm (10 inches) block (the architect has planned a 36.5cm (14 inches) block PPL 4 for the basement), which amounts to about €200 for the entire house.
Therefore, I would save approximately €11,000 while achieving the same insulation value.
That almost sounds too good to be true. Could someone here possibly confirm this, or have I made an error in my calculation?
My building project has now become quite concrete.
I just visited the energy consultant at the consumer advice center (1 hour = 10€).
He noticed the following:
The exterior wall consists of aerated concrete blocks (PPL 2), thickness = 24cm (10 inches), and an external thermal insulation composite system (ETICS) with a thickness of 14cm (6 inches).
He said that it would be possible to save a significant amount of money while maintaining the same insulation value by using a 36.5cm (14 inches) block instead of the 24cm (10 inches) aerated concrete block. The mason does not receive a higher hourly wage, and the larger block is generally preferred and, above all, faster to install (apparently it is done using a crane).
According to this, my €21,000 for exterior plaster including ETICS could be reduced to around €10,000. The 36.5cm (14 inches) aerated concrete block costs only €3.40 more per cubic meter compared to the 24cm (10 inches) block (the architect has planned a 36.5cm (14 inches) block PPL 4 for the basement), which amounts to about €200 for the entire house.
Therefore, I would save approximately €11,000 while achieving the same insulation value.
That almost sounds too good to be true. Could someone here possibly confirm this, or have I made an error in my calculation?
No. We are building it the same way. Ytong exterior walls 36.5cm (14.4 inches) plus Weber plaster. Gas heating, solar thermal panels on the roof. Works well. KfW 70 easily meets the house’s energy standard. With this heat pump, it would have been KfW 55. But I think these units are misleading. When it’s really cold, you end up heating with electricity. Is that really eco-friendly?
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