How is the "typical wall thickness" determined for double-shell walls?

  • Erstellt am 2021-11-04 19:48:29

karl.jonas

2021-11-04 19:48:29
  • #1
Hello, I have now read a lot about possible wall constructions, there doesn't seem to be the right variant, ok. But if I add up what is recommended (assuming one prefers more insulation rather than less), then I come to about 1 (plaster) + 30 (Poroton) + 18 (rock wool) + 4 (ventilation gap) + 12 (clinker) = 65 cm for a two-shell wall construction with Poroton inside and clinker outside. However, when I google "typical wall thickness" it is rather 49 cm or less (for a "normal" KFW55 or KFW40 house). Where am I wrong? Karl
 

Martial.white

2021-11-04 20:53:22
  • #2
Isn't that a three-layer construction in your case?

For comparison, the construction for KfW55 has 17.5 cm sand-lime brick and 21 cm plastic (plus plaster).
 

11ant

2021-11-04 21:44:52
  • #3
"Google" here or elsewhere "Steinemantra". There you will find my recommendation (explained) that there are exactly as many recommendable wall constructions as your builder has concrete experience portfolios. Simply put: at the point where you do not make the structural masonry shell slimmer if you provide a facing shell. You add 100% on top, which always results in more than a whole. Why do you want to put the cart before the horse when it comes to wall thickness?
 

Grobmutant

2021-11-04 21:54:46
  • #4
30 cm Poroton with 18 cm internal insulation is unusual, which is why you end up with such a thick wall.

We get:
17.5 cm aerated concrete, 16 cm mineral wool, 2 cm air, 11.5 cm clinker = 47 cm

Then the interior plaster comes before that.
 

Durran

2021-11-04 22:36:14
  • #5
Rock wool and clinker are rather insulation than wall construction. A wall is a static element with a load-bearing function.

A double-shell wall construction basically means an inner wall and an outer wall built in composite. In the then open intermediate space, the insulating material was simply air. So in the past, clinker bricks were used, inner wall 12 cm, outer wall 12 cm, with 12 cm air in between. Both walls were then connected in the intermediate space with clinker bricks. Therefore built in composite.

Then inner and outer plaster
 

Benutzer200

2021-11-04 22:49:18
  • #6
Our last new building was, for example, 17.5 calcium silicate brick + 14 insulation + 11.5 facing brick. An air gap is not necessary.
 

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