Is the wall thickness sufficient or is it too sound-permeable?

  • Erstellt am 2009-03-30 22:06:55

Cmajere

2009-03-30 22:06:55
  • #1
Hello everyone,

I have an offer here for a Kfw60 house with an air-water heat pump. The offer actually seems very reliable and is available directly here in my city.

The only thing that worries me is the walls because I have heard so far that 24 cm exterior walls are built + insulation, but the KfW 60 house is supposed to manage with 17.5 cm exterior walls made of Poroton, KSV or glw + 12 cm mineral insulating plaster.

Non-load-bearing interior walls are supposed to be only 11.5 cm thick. Is that enough or is it too thin?

What does KSV mean?

Best regards
 

Lily

2009-03-31 07:18:54
  • #2
Hello,

the exterior walls seem very thin to you, but that is because there is still a layer of insulation to be applied.
We also live in a house with such walls and it is not at all noisy.

Wallküre
 

JOERG24

2009-04-08 16:27:45
  • #3
So I plan to build my garage with 240mm sand-lime brick masonry. 175mm already seems a bit thin to me. I think plaster will be applied on the interior walls. Then it should end up at 150mm in the end. That is actually normal. Maybe there is also a masonry expert here.
 

Danton

2009-04-21 10:42:17
  • #4
Hello Cmajere,

first of all: KSV = Kalksand solid brick, so without holes, otherwise it would be a KSL.

These come in different density classes, the heavier, the better the sound insulation.

A wall thickness of 17.5 cm for exterior walls and 11.5 cm for non-load-bearing interior walls is completely sufficient.
For the external thermal insulation composite system, however, I would rather go for 16.0 cm insulation thickness + plaster.
This also depends on the thermal transmittance coefficient (U-value) of the insulation material, the lower the U-value, the better the insulation effect.

Whether it 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 matters here.

Regards Danton
 

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