Hello experts,
I’m new here and really excited to have found this site. We plan to build next year and are still in the planning phase. The following points are very important to me for the build.
- Solid construction with Poroton (36.5 cm (14.4 inches) exterior wall)
- Without ETICS (external thermal insulation composite system)
- KfW 70 standard
- Air-to-water heat pump
- Underfloor heating
- Triple-glazed windows
I want to build with Poroton, but I already have some doubts. I’ve read a lot about filled Poroton bricks like T7, T8, T9, and Unipor Coriso WS08. My question is whether I could also use an unfilled Poroton brick, such as Unipor WS09 or T9 plan bricks. I contacted Wienerberger to ask which bricks would be suitable. They said that the filled bricks are good, but if unfilled and without external insulation, then the T9 plan bricks (36.5 cm (14.4 inches)) would be recommended.
Is this suitable for a KfW 70 house, and does anyone here have experience with this? Alternatively, I would consider using the filled bricks, but I’m not sure about the practical experience with those, especially combined with perlite or mineral wool.
Thank you very much for your answers.
Regards,
jayden1977
I’m new here and really excited to have found this site. We plan to build next year and are still in the planning phase. The following points are very important to me for the build.
- Solid construction with Poroton (36.5 cm (14.4 inches) exterior wall)
- Without ETICS (external thermal insulation composite system)
- KfW 70 standard
- Air-to-water heat pump
- Underfloor heating
- Triple-glazed windows
I want to build with Poroton, but I already have some doubts. I’ve read a lot about filled Poroton bricks like T7, T8, T9, and Unipor Coriso WS08. My question is whether I could also use an unfilled Poroton brick, such as Unipor WS09 or T9 plan bricks. I contacted Wienerberger to ask which bricks would be suitable. They said that the filled bricks are good, but if unfilled and without external insulation, then the T9 plan bricks (36.5 cm (14.4 inches)) would be recommended.
Is this suitable for a KfW 70 house, and does anyone here have experience with this? Alternatively, I would consider using the filled bricks, but I’m not sure about the practical experience with those, especially combined with perlite or mineral wool.
Thank you very much for your answers.
Regards,
jayden1977
Well then, let’s bring this topic back to life.
I’m interested in it as well.
Our general contractor (GC) provides a T9 block as standard, unfilled. Recently, we visited our new neighbors who used the same block from the same GC, and we were surprised at how thin the sound insulation in their house was. You could hear cars outside in the stairwell. It’s worth mentioning that the roof insulation was not fully installed from the inside yet, and the blocks were mortared rather than glued, with large mortar joints everywhere.
Since then, we’ve been considering requesting the T9 block with a perlite fill. So here’s my question. However, our GC does not want to install this because of reportedly poor handling experience. The fill could fall out, extra work involved, and so on. They did offer it, but I suspect with a significant “risk surcharge.” They quoted €7,750 for our house with about 200m² (2,150 sq ft) of heated living space over two full floors. As I said, that seems extremely high to me.
Are there any assessments or experiences here?
Now we’re reconsidering and thinking that for €8,250 it might be better to go for KfW 55 standard instead. That would give us much more: better insulation, etc., and a T8 block instead of the T9, although unfilled and probably with the same issues (crumbling, poor sound insulation). And yes, the T8 block is adequate, the energy consultant calculated it. Although the difference between T8 and T9 is probably small, what you save there you pay for with even worse sound insulation and thinner webs, which means more fragile.
We’re located near a busy road, so we would have liked to improve the sound insulation. But for that price, it doesn’t really seem worth it. Besides, I’m unsure if the claim of a 3dB reduction with perlite blocks will actually hold true. 3dB sounds like little, but it actually means 100% less sound at the same frequency.
What’s your take on this?
I’m interested in it as well.
Our general contractor (GC) provides a T9 block as standard, unfilled. Recently, we visited our new neighbors who used the same block from the same GC, and we were surprised at how thin the sound insulation in their house was. You could hear cars outside in the stairwell. It’s worth mentioning that the roof insulation was not fully installed from the inside yet, and the blocks were mortared rather than glued, with large mortar joints everywhere.
Since then, we’ve been considering requesting the T9 block with a perlite fill. So here’s my question. However, our GC does not want to install this because of reportedly poor handling experience. The fill could fall out, extra work involved, and so on. They did offer it, but I suspect with a significant “risk surcharge.” They quoted €7,750 for our house with about 200m² (2,150 sq ft) of heated living space over two full floors. As I said, that seems extremely high to me.
Are there any assessments or experiences here?
Now we’re reconsidering and thinking that for €8,250 it might be better to go for KfW 55 standard instead. That would give us much more: better insulation, etc., and a T8 block instead of the T9, although unfilled and probably with the same issues (crumbling, poor sound insulation). And yes, the T8 block is adequate, the energy consultant calculated it. Although the difference between T8 and T9 is probably small, what you save there you pay for with even worse sound insulation and thinner webs, which means more fragile.
We’re located near a busy road, so we would have liked to improve the sound insulation. But for that price, it doesn’t really seem worth it. Besides, I’m unsure if the claim of a 3dB reduction with perlite blocks will actually hold true. 3dB sounds like little, but it actually means 100% less sound at the same frequency.
What’s your take on this?
I’m currently looking into those with mineral wool as well. However, I don’t expect them to be much cheaper. And 7,000€ is really too much for me, especially since the thermal insulation value isn’t even better. I found another solution. I compared three brick manufacturers and found that one T9 brick has a significantly better density and compressive strength than the others. It is two strength classes higher, while having the same U-value. The better the density and compressive strength, the better the sound insulation. So, we’re optimizing in this way by choosing this brick (ThermoPlan S9). It doesn’t cost us any extra. It might not offer as much as perlite-filled bricks, but it’s free of additional cost and should be a good compromise.
tabtab schrieb:
3 dB sounds like a small amount, but it actually means 100% less noise at the same frequency.Incorrect. It means 50% less noise – or 100% more if you start from the quieter point – and “noise” here refers to sound intensity.
tabtab schrieb:
The better the bulk density and compressive strength, the better the sound insulation value.Compressive strength does not matter—it only roughly correlates with bulk density. Sound is best absorbed by a lot of mass. High bulk density means high mass, which means better sound absorption.
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