ᐅ Is the wall thickness sufficient, or will it allow too much sound to pass through?
Created on: 30 Mar 2009 22:06
C
CmajereHello everyone,
I have a quote here for a KfW 60 house with an air-to-water heat pump. The offer seems very reliable and is available right here in my city.
The only concern I have is about the walls. From what I’ve heard, people usually build 24 cm (9.5 inches) exterior walls plus insulation. However, the KfW 60 house is supposed to be fine with 17.5 cm (7 inches) exterior walls made of Poroton, KSV, or gas concrete blocks, plus 12 cm (5 inches) of mineral-based insulating plaster.
The non-load-bearing interior walls are said to be only 11.5 cm (4.5 inches) thick. Is that enough, or will it be too thin and noisy?
What does KSV mean?
Best regards
I have a quote here for a KfW 60 house with an air-to-water heat pump. The offer seems very reliable and is available right here in my city.
The only concern I have is about the walls. From what I’ve heard, people usually build 24 cm (9.5 inches) exterior walls plus insulation. However, the KfW 60 house is supposed to be fine with 17.5 cm (7 inches) exterior walls made of Poroton, KSV, or gas concrete blocks, plus 12 cm (5 inches) of mineral-based insulating plaster.
The non-load-bearing interior walls are said to be only 11.5 cm (4.5 inches) thick. Is that enough, or will it be too thin and noisy?
What does KSV mean?
Best regards
I am planning to build my garage using 240mm (9.5 inches) sand-lime brick masonry. 175mm (7 inches) already seems a bit thin to me.
I think there will be plaster applied to the interior walls. That should bring it to about 150mm (6 inches) in the end. That is actually standard.
Maybe there is a masonry expert here who can advise.
I think there will be plaster applied to the interior walls. That should bring it to about 150mm (6 inches) in the end. That is actually standard.
Maybe there is a masonry expert here who can advise.
Hello Cmajere,
first of all: KSV stands for solid sand-lime brick, meaning it has no holes; otherwise, it would be a KSL.
These bricks come in different density classes—the heavier, the better the sound insulation.
A wall thickness of 17.5cm (7 inches) for exterior walls and 11.5cm (4.5 inches) for non-load-bearing interior walls is completely sufficient.
For an external thermal insulation composite system, I would rather recommend an insulation thickness of 16.0cm (6.3 inches) plus plaster.
However, this also depends on the thermal transmittance (U-value) of the insulation material: the lower the U-value, the better the insulation performance.
Whether this is sufficient for a KfW 60 house also depends on the construction and insulation value of the other building elements (foundation, windows, roof, etc.), since the overall energy demand of the house is what really matters.
Regards,
Danton
first of all: KSV stands for solid sand-lime brick, meaning it has no holes; otherwise, it would be a KSL.
These bricks come in different density classes—the heavier, the better the sound insulation.
A wall thickness of 17.5cm (7 inches) for exterior walls and 11.5cm (4.5 inches) for non-load-bearing interior walls is completely sufficient.
For an external thermal insulation composite system, I would rather recommend an insulation thickness of 16.0cm (6.3 inches) plus plaster.
However, this also depends on the thermal transmittance (U-value) of the insulation material: the lower the U-value, the better the insulation performance.
Whether this is sufficient for a KfW 60 house also depends on the construction and insulation value of the other building elements (foundation, windows, roof, etc.), since the overall energy demand of the house is what really matters.
Regards,
Danton
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