Which stone is used when building with clinker?

  • Erstellt am 2011-03-03 08:15:16

Martin_S

2011-03-03 08:15:16
  • #1
Hello,

My wife and I are considering building, and initially, we wanted to have the house (KFW70) plastered. Since we both also like to occasionally hang a lamp, mailbox, etc. on the exterior wall, it quickly became clear to us that the exterior walls should be made of solid aerated concrete. We were also advised to do so because materials behave differently at different temperatures, which can lead to energy loss.
However, now we want to have our house clad with bricks, and the construction and performance description for brick cladding provides that a smaller brick with a lot of insulation wool should be used. Personally, I wonder whether one should not still use the solid aerated concrete wall + the brick cladding instead of exterior plaster.

Therefore, my question is: What is the point of changing the structure of the exterior wall when having the house clad with bricks?

Oh yes, my suspicion that this would reduce the thickness of the exterior wall was unfortunately not confirmed. Both exterior wall structures have the same thickness (not counting the brick cladding).

Thank you very much for your help

Best regards

Martin
 

blurboy

2011-03-03 08:25:08
  • #2
If I’m not mistaken: a) it has something to do with the U-value (meaning you wouldn’t achieve it like that or only with 36.5 cm aerated concrete + clinker = a pretty thick wall) b) it’s smarter if the clinker facade is somewhat ventilated from behind
 

Martin_S

2011-03-03 08:43:18
  • #3
Hello,

the U-value was not communicated to us, but it will be a KFW70 house. I think the wall thickness was about 40 cm. (U-value will therefore be around 0.20)

...but in principle, it would also be possible to leave an air gap between the brick facing and the solid wall.

So what is the purpose of the different wall constructions?
Maybe it’s the thickness of the exterior wall after all?

Best regards

Martin
 

blurboy

2011-03-03 09:05:17
  • #4
So the U-value does not result from the wall thickness, but from the materials and thickness etc.
Porous concrete + air layer + clinker will not work, because then the porous concrete is somewhat unprotected and it absorbs water.
But this is just my layman's consideration, surely the experts will have something to say about this!
 

E.Curb

2011-03-03 09:23:11
  • #5
Hello,
it would be interesting to know the exact composition of your wall. The U-value, as blurboy already mentioned, depends not only on the thickness of the masonry but also on the properties of the material. If you build a single-layer solid wall, it has to be relatively thick to achieve a certain U-value. However, if you place a facing stone in front of your facade, it makes sense to design the backing masonry (the load-bearing part of your exterior wall) somewhat narrower and equip it with insulation and a subsequent air layer.

Regards
 

Martin_S

2011-03-03 11:59:13
  • #6
Hello,

So is it only due to the thickness of the masonry? As far as I have seen, the solid wall is constructed as follows:

(from inside to outside)
Interior plaster
Aerated concrete block (approx. 37 cm)
Exterior plaster

With the clinker brick as follows:
(from inside to outside)
Interior plaster
Aerated concrete block (approx. 20 cm)
Insulation material
Air layer
Clinker brick.

From what I read in the answers, the aim is to achieve a relatively high insulation performance = low U-value with a relatively thin exterior wall. However, a different wall construction is not fundamentally necessary if there is an air layer between the clinker brick and the "masonry" (aerated concrete block or insulation material).

Is there possibly a cost aspect here? What is ultimately cheaper? Solid wall with aerated concrete or rather thinner solid wall with lots of insulation?

Best regards

Martin
 

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