Hello dear community,
Although this topic has been discussed in several posts before, long-term experiences are missing here.
I am currently planning a 150 m² (1,615 sq ft) new build with a basement. We have now narrowed down our choice to two builders who differ fundamentally in their building materials.
The house is planned to be built without insulation, using a monolithic construction method. One builder wants to use aerated concrete or Poroton blocks (wall thickness 36.5 cm (14 inches)), while the other plans to use a solid precast wall made of expanded clay aggregate with a wall thickness of 41 cm (16 inches). We are now a bit uncertain because the thermal transmittance (U-value) given by the builders differs greatly: 0.21 W/m²K for Poroton and 2.2 W/m²K for expanded clay. Both assure us that the houses meet the KFW 55 standard.
I am unclear how the U-values can differ so much or whether other factors, such as the mortar used with Poroton, are included. The insulation in the attic and the windows (triple glazed) seem comparable in both cases. Are there any long-term experiences in this forum with solid walls made from expanded clay?
Can you tell me whether a similar energy balance for heating can be expected based on the KFW 55 standard?
Our concern is that with poor insulation and a heat pump, we might not achieve sufficient room heating or end up with very high heating costs due to additional electric heating rods.
Best regards,
Sven
Although this topic has been discussed in several posts before, long-term experiences are missing here.
I am currently planning a 150 m² (1,615 sq ft) new build with a basement. We have now narrowed down our choice to two builders who differ fundamentally in their building materials.
The house is planned to be built without insulation, using a monolithic construction method. One builder wants to use aerated concrete or Poroton blocks (wall thickness 36.5 cm (14 inches)), while the other plans to use a solid precast wall made of expanded clay aggregate with a wall thickness of 41 cm (16 inches). We are now a bit uncertain because the thermal transmittance (U-value) given by the builders differs greatly: 0.21 W/m²K for Poroton and 2.2 W/m²K for expanded clay. Both assure us that the houses meet the KFW 55 standard.
I am unclear how the U-values can differ so much or whether other factors, such as the mortar used with Poroton, are included. The insulation in the attic and the windows (triple glazed) seem comparable in both cases. Are there any long-term experiences in this forum with solid walls made from expanded clay?
Can you tell me whether a similar energy balance for heating can be expected based on the KFW 55 standard?
Our concern is that with poor insulation and a heat pump, we might not achieve sufficient room heating or end up with very high heating costs due to additional electric heating rods.
Best regards,
Sven
Ybias78 schrieb:
We are building without insulation and without facing bricks. Inside, we will use lime-gypsum plaster. On the outside, only plaster as well.We are building exactly the same way as you.face26 schrieb:
So, it is a stone you can build with. Monolithic construction with 36.5cm (14.4 inches) meets the energy standard adequately, but no more. Sound insulation is similar.
Don’t get me wrong, I just want to put the claim that this is a "very good stone" into perspective.
It depends on what your requirements are.
Everything else becomes a matter of philosophy. No problem. I’m not here for confirmation, but to ask questions. We are building KfW 55 with this stone. The windows are passive house quality, and the general contractor guarantees KfW 55 for the monolithic construction method. I’m only interested in the sound insulation.
So, KfW 55 with the brick is probably the minimum standard, I would say. Although KfW 55 is only conditionally meaningful. In the end, it's just back-and-forth calculations.
The combination of the S9 with passive house windows seems interesting to me. Energy-wise, you have a Golf (brick) with a Porsche.
I'm not a construction professional either, so it sounds a bit odd to me.
Sound insulation is another issue. The question is whether the overall concept fits and how your personal perception is. Because if the windows aren’t effective, the wall is only somewhat decisive.
On paper, the sound insulation value is not particularly good according to calculations. Yours is about 41 dB. I have a filled window from another manufacturer that reaches 46 dB.
Is noise an issue? Street, railway, or something similar?
The combination of the S9 with passive house windows seems interesting to me. Energy-wise, you have a Golf (brick) with a Porsche.
I'm not a construction professional either, so it sounds a bit odd to me.
Sound insulation is another issue. The question is whether the overall concept fits and how your personal perception is. Because if the windows aren’t effective, the wall is only somewhat decisive.
On paper, the sound insulation value is not particularly good according to calculations. Yours is about 41 dB. I have a filled window from another manufacturer that reaches 46 dB.
Is noise an issue? Street, railway, or something similar?
face26 schrieb:
So, KfW 55 using masonry is, I’d say, the lower limit. Although KfW 55 isn’t always very meaningful. In the end, it’s a matter of back-and-forth calculations.
The combination of the S9 system with Passive House windows seems interesting. Energetically, you have a Golf (masonry) paired with a Porsche.
I’m not a building expert either; it sounds a bit odd to me.
Sound insulation is a tricky topic as well. The question is whether the overall concept works and what your personal perception is. Because if the windows aren’t effective, the wall alone is only partly decisive.
On paper, the sound insulation value isn’t very good. Yours is about 41 dB. I have a filled system from another manufacturer that achieves 46 dB.
Is noise really an issue? Road, railway, or something similar? We’re not particularly sensitive. The house will be built on the main road (a country road) of a village. However, it will be positioned about 15 meters (50 feet) from the property boundary. Bedrooms are not planned on the street side.
face26 schrieb:
Don’t get me wrong, I just want to put the statement that this is a "very good brick" into some perspective.Well, it’s simply a "good" brick, not the "best." Standard quality like @Nordlys: solid material, the residents like it, no need for an innovation award.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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