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
Bluesky schrieb:
Is there anyone in this forum who has built with expanded clay aggregate and can share their experiences?Hello, we built with expanded clay aggregate, Liaplan Ultra08, with 42cm (17 inches) wall thickness and have been living in it for a year. It’s a 125m2 (1345 sq ft) bungalow with a pitched roof, no mechanical ventilation system, and here are our experiences:
Heating and domestic hot water are provided by an air-source heat pump, consuming 3100 kWh per year.
Almost no noise passes through the walls, doors, and windows—the neighbor’s grass trimmer is barely audible. Sounds come very quietly through the roof structure—our design is an open construction with 5m (16 feet) ceiling height.
The construction was carefully supervised by our building consultant, making the process stress-free. They identified and resolved any issues… very much appreciated, it was worthwhile for us. The build was nearly flawless, with very precise measurements—the shell was erected to the millimeter.
Nida35a schrieb:
Hello,
we built with expanded clay aggregate, Liaplan Ultra08, with 42cm (16.5 inches) wall thickness and have been living here for one year, 125m2 (1,345 sq ft), bungalow, pitched roof, no mechanical ventilation system, and here are our experiences:
Heating + domestic hot water with an air-source heat pump, 3100 kWh/year,
almost no noise comes through walls, doors, or windows; the neighbor’s lawn trimmer is barely audible, sounds come through very quietly via the roof structure—our roof was built with an open design, room height is 5m (16.4 ft).
The construction was supervised by a building consultant, which made it stress-free for us. He found and had mistakes corrected… respect to him, it was worth it for us. An almost error-free build, very accurate measurements, the shell construction was aligned to the millimeter. Do you have soundproof windows installed? Otherwise, the noise should come through there.
@Bookstar
Windows with triple glazing, higher burglary resistance rating, thicker panes,
better insulation for roof and foundation slab.
With the windows closed, it is quiet, in the flight path area of Tegel Airport, and since it is about to close and air traffic has been reduced due to COVID-19, we live with doors and windows open.
Windows with triple glazing, higher burglary resistance rating, thicker panes,
better insulation for roof and foundation slab.
With the windows closed, it is quiet, in the flight path area of Tegel Airport, and since it is about to close and air traffic has been reduced due to COVID-19, we live with doors and windows open.
Nida35a schrieb:
@Bookstar
Triple-glazed windows, enhanced burglary resistance class, thicker panes,
better insulation for the roof and floor slab.
When the windows are closed, it’s quiet—flight path of Tegel Airport—and now that it’s about to close and air traffic has been reduced due to COVID, we live with doors and windows open. What material did you use to insulate your roof? Is it an exposed roof truss?
N
nordanney22 May 2020 11:33Bookstar schrieb:
Do you have soundproof windows? Otherwise, the noise would have to come through there.Well, your question should rather be: Do you have windows? Soundproof windows are initially not related to the wall structure.
Nida35a schrieb:
Flight path zone of Tegel Airport, and since it is closing soon and Corona has cut air traffic,Does Tegel only handle passenger flights?https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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