ᐅ Solid Wall House: Which Type of Block? Poroton, Liapor / Expanded Clay, Ytong?
Created on: 19 Feb 2015 06:57
K
krausf3
Hello,
we are currently working on our house planning (for the second time).
Since our first attempt in 2011, a lot has changed.
We would like to hear your impressions of the building materials mentioned above.
At the moment, we are unsure how good all these different materials really are.
What would you recommend and why?
Best regards,
Florian
we are currently working on our house planning (for the second time).
Since our first attempt in 2011, a lot has changed.
We would like to hear your impressions of the building materials mentioned above.
At the moment, we are unsure how good all these different materials really are.
What would you recommend and why?
Best regards,
Florian
B
Bauexperte4 Mar 2015 16:31Hello,
**The weighted sound reduction index R`w of a single-layer element, whether a panel, ceiling or wall, depends on the surface mass. The heavier the wall, the better the sound insulation. The prerequisite is the airtightness of the wall: no air gaps or large cavities. The type of material plays only a limited role, and the effect of stiffness is relatively low. The sound reduction index R` of walls and ceilings generally increases with frequency.
The influence of small cavities is largely negligible. However, staggered brick holes have a negative effect, as they make the brick “softer.” Large cavities cause resonances in the individual shells, reducing sound insulation. The effect can only be determined by measurement.
In thick exterior walls with low bulk density, thickness resonances (due to low elasticity modulus, low bulk density) can reduce sound insulation. Staggered holes particularly affect thickness resonances: walls made of bricks with staggered holes lose stiffness compared to those with continuous webs, resulting in about 10% lower average sound reduction.
The weighted sound reduction index R`w of plastered walls on both sides depends on the raw density class of the bricks and wall thickness:
Of course, the four types of bricks mentioned would show varying sound values in other raw density classes. In any case, renders have a significant effect on sound insulation. They seal joints and increase the stiffness of “soft” perforated bricks. Even a one-sided render can effectively compensate for leaks in the masonry.
A special effect is material damping, the conversion of structure-borne sound vibration energy of the wall into heat. Better sound insulation than expected from the weight curve has been measured on the test bench and on site for walls made of lightweight concrete, especially aerated concrete. This is due to the damping properties of the material itself and the enhanced transmission of sound pressure to other components.
**Sources: DIN 4109 Sound Insulation in Buildings: Requirements and Achtziger, Joachim; Pfeifer, Günther; Ramcke, Rolf; Zilch, Konrad, Masonry Atlas, Birkhäuser, Basel Boston Berlin 2007
I couldn’t quickly find calculations for 36.5cm (14.5 inches) masonry, but results should be even better.
Regards, Bauexperte
maximax schrieb:I expected nothing else May I ask in which field?
And I am a natural scientist ...
maximax schrieb:No such thing as a silly question It has been standard practice for quite some time now to include not only the properties of individual components but also their acoustic characteristics in the calculations. If I remember correctly, things called decoupling or isolation profiles are used for that.
But a silly question: What about non-load-bearing interior walls? You can decouple those, right?
maximax schrieb:I wouldn’t say so, not even theoretically ... but I’m just a businessperson and sales assistant
And theoretically, lightweight walls are also composite masonry, right?
maximax schrieb:That’s a somewhat outdated viewpoint; but of course, a matter of personal preference. There simply isn't “THE” perfect brick or block that alone can guarantee everything. And if you prefer monolithic plastered facades, your favorite choice is generally a no-go.
Which, in my amateur opinion, is actually the most consistent construction method (ideally combined with a ventilated rainscreen facade, though that’s not exactly cheap), because you can best avoid thermal bridges that way.
maximax schrieb:Too bad I won’t be present at your consulting meetings; your sales assistant will certainly enjoy working with you
Or at least when building with Poroton inside using smooth bricks RDK 1.4 or soundproof bricks RDK 2, and also don’t cut costs on load-bearing walls ...
maximax schrieb:Sound insulation class 3 is usually unproblematic; beyond that, a structural engineer has to do the calculations anyway.
At least not for exterior masonry in a quiet residential area.
maximax schrieb:I’ve simply copied this for convenience; I think it’s explained reasonably understandably for laypeople:
One silly question I don’t quite understand: Why do people always talk about mass when it comes to sound insulation?
**The weighted sound reduction index R`w of a single-layer element, whether a panel, ceiling or wall, depends on the surface mass. The heavier the wall, the better the sound insulation. The prerequisite is the airtightness of the wall: no air gaps or large cavities. The type of material plays only a limited role, and the effect of stiffness is relatively low. The sound reduction index R` of walls and ceilings generally increases with frequency.
The influence of small cavities is largely negligible. However, staggered brick holes have a negative effect, as they make the brick “softer.” Large cavities cause resonances in the individual shells, reducing sound insulation. The effect can only be determined by measurement.
In thick exterior walls with low bulk density, thickness resonances (due to low elasticity modulus, low bulk density) can reduce sound insulation. Staggered holes particularly affect thickness resonances: walls made of bricks with staggered holes lose stiffness compared to those with continuous webs, resulting in about 10% lower average sound reduction.
The weighted sound reduction index R`w of plastered walls on both sides depends on the raw density class of the bricks and wall thickness:
- Hollow blocks (RDK 0.8): wall thickness 17.5cm (7 inches) – 44 dB / wall thickness 24cm (9.5 inches) – 46 dB
- Hollow bricks (RDK 1.2): wall thickness 17.5cm (7 inches) – 45 dB / wall thickness 24cm (9.5 inches) – 48 dB
- Concrete (RDK 1.4): wall thickness 17.5cm (7 inches) – 48 dB / wall thickness 24cm (9.5 inches) – 52 dB
- Calcium silicate bricks (RDK 1.8): wall thickness 17.5cm (7 inches) – 51 dB / wall thickness 24cm (9.5 inches) – 54 dB
Of course, the four types of bricks mentioned would show varying sound values in other raw density classes. In any case, renders have a significant effect on sound insulation. They seal joints and increase the stiffness of “soft” perforated bricks. Even a one-sided render can effectively compensate for leaks in the masonry.
A special effect is material damping, the conversion of structure-borne sound vibration energy of the wall into heat. Better sound insulation than expected from the weight curve has been measured on the test bench and on site for walls made of lightweight concrete, especially aerated concrete. This is due to the damping properties of the material itself and the enhanced transmission of sound pressure to other components.
**Sources: DIN 4109 Sound Insulation in Buildings: Requirements and Achtziger, Joachim; Pfeifer, Günther; Ramcke, Rolf; Zilch, Konrad, Masonry Atlas, Birkhäuser, Basel Boston Berlin 2007
I couldn’t quickly find calculations for 36.5cm (14.5 inches) masonry, but results should be even better.
Regards, Bauexperte
EveundGerd4 Mar 2015 19:19Our developer managed to meet the soundproofing requirements for a house near the airport using Ytong blocks.
Of course, the windows also played an important role in this. I often notice that many people forget that Ytong walls are still walls.
Of course, the windows also played an important role in this. I often notice that many people forget that Ytong walls are still walls.
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