ᐅ Y-Tong (aerated concrete) – a quality building material? (Sound insulation!)
Created on: 20 Aug 2018 19:58
B
Bauherr&-frau
Dear Forum,
Our developer plans to use "Ytong PPW2 d = 36.5 cm (14.4 inches) for the exterior walls according to the scope of work. Inside, 17.5 cm (6.9 inches). On the outside, a 3 mm (0.1 inch) mineral-based lightweight plaster will be applied. To me, this seems somewhat minimal compared to the insulation and materials others are using.
We are wondering if the thermal insulation requirements are met without additional insulation? And what about mold and ventilation? A air-to-water heat pump with underfloor heating is planned.
What worries us even more is the soundproofing, since we have a cobblestone street right outside. A friend who is an engineer told me yesterday that Ytong has "poor sound insulation properties."
So even triple-glazed windows with enhanced soundproofing probably won’t help much? [B] I would appreciate honest clarification and possibly some alternative suggestions. We are not experts and I don’t want to hear every car! Some friends of ours build with calcium silicate blocks and are very satisfied. Their father is an architect and swears by them.
Many thanks and best regards! We would be lost without you!
Our developer plans to use "Ytong PPW2 d = 36.5 cm (14.4 inches) for the exterior walls according to the scope of work. Inside, 17.5 cm (6.9 inches). On the outside, a 3 mm (0.1 inch) mineral-based lightweight plaster will be applied. To me, this seems somewhat minimal compared to the insulation and materials others are using.
We are wondering if the thermal insulation requirements are met without additional insulation? And what about mold and ventilation? A air-to-water heat pump with underfloor heating is planned.
What worries us even more is the soundproofing, since we have a cobblestone street right outside. A friend who is an engineer told me yesterday that Ytong has "poor sound insulation properties."
So even triple-glazed windows with enhanced soundproofing probably won’t help much? [B] I would appreciate honest clarification and possibly some alternative suggestions. We are not experts and I don’t want to hear every car! Some friends of ours build with calcium silicate blocks and are very satisfied. Their father is an architect and swears by them.
Many thanks and best regards! We would be lost without you!
Are the differences really noticeable?
Soundproofing? Energy loss?
If I had the space, I probably would have chosen calcareous sandstone plus double the necessary insulation. But since my house wasn’t allowed to be even 1 m² (11 ft²) larger (only 30% of the plot can be built upon), I went with 17.5 cm (7 inches) Ytong blocks plus insulation and a facing brick. A completely standard setup: total wall thickness around 46 cm (18 inches).
I think optimizing already good energy values is something for nerds (just my personal opinion).
For example: I have my windows tilted open almost 24 hours a day.
Installing underfloor insulation pays off only after 50 years.
The basic principle: all new houses have excellent standard energy performance these days, so I don’t need to save 50 dollars a year on energy.
Also, resale value doesn’t depend on that.
Buyers care about the house and the location. Whether it’s energy efficiency class 55 or 40—I can guarantee for us that’s not the main concern.
Soundproofing? Energy loss?
If I had the space, I probably would have chosen calcareous sandstone plus double the necessary insulation. But since my house wasn’t allowed to be even 1 m² (11 ft²) larger (only 30% of the plot can be built upon), I went with 17.5 cm (7 inches) Ytong blocks plus insulation and a facing brick. A completely standard setup: total wall thickness around 46 cm (18 inches).
I think optimizing already good energy values is something for nerds (just my personal opinion).
For example: I have my windows tilted open almost 24 hours a day.
Installing underfloor insulation pays off only after 50 years.
The basic principle: all new houses have excellent standard energy performance these days, so I don’t need to save 50 dollars a year on energy.
Also, resale value doesn’t depend on that.
Buyers care about the house and the location. Whether it’s energy efficiency class 55 or 40—I can guarantee for us that’s not the main concern.
M
Mottenhausen15 Oct 2018 00:07Bauherr&-Frau schrieb:
Sound insulation with PP4 alone is sufficient (calcium silicate blocks offer similar values in some cases). Thermal insulation is very good. The house is breathable. The price-performance ratio is reasonable. Stability is assured, as it is even suitable for multi-story buildings. This will definitely support our two-story city villa and even the kitchen cabinet.Be cautious with synthetic sound insulation values; laboratory measurements and subjective perception are two different things. Sound can only be reduced through mass, and when comparing the density of calcium silicate blocks versus aerated concrete (Ytong), further discussion becomes unnecessary. We currently live on a paved street in our rental apartment, and it can be disturbing. Even after years, one does not get fully used to it.
The breathability of a purely mineral construction can also be significantly limited depending on the wall setup (exterior facade paint, interior wallpaper adhesive). This can lead to condensation and subsequently mold at thermal bridges, making "breathability" ineffective. An external thermal insulation composite system (ETICS, also known as external insulation finishing system or EIFS) is a straightforward way to avoid thermal bridges—it means fewer errors can occur during construction, essentially wrapping the entire building like a parcel. Pavel can manage this as well, even if the foreman is currently at another construction site.
All other materials also offer these additional advantages.
blaupuma schrieb:
If I had had the space Well, it obviously seems there was plenty of space, because
blaupuma schrieb:
Overall wall thickness about 46 cm (18 inches). doesn’t really sound like a space-saver.
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11ant schrieb:
Well, there obviously was plenty of it, because
doesn't really sound like a space saver at all.As you know, facing brick is a must for me. If you want facing brick, this thickness is standard.
blaupuma schrieb:
As you know, cladding is a must for me.
If you want cladding, this thickness is standard But that would also be the case with calcium silicate blocks. Or do you want to achieve more than just the energy saving regulation?
blaupuma schrieb:
As you know, facing brick is a must for me.
If you want facing brick, this thickness is standardBut then the comparison to a wall structure with external wall insulation is flawed. Because you wrote that the insulation thickness would be doubled. That is, of course, unnecessary and not very practical.
For example, a KFW 55 standard can be achieved with 17.5cm (7 inches) calcium silicate brick and 16cm (6.3 inches) insulation with a thermal conductivity of 0.032 W/(m·K).
If you replace the calcium silicate brick with hollow clay blocks or aerated concrete, you can save a few centimeters.
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