Cracks in Ytong, are these only a visual defect?

  • Erstellt am 2021-03-06 20:45:45

Nutshell

2021-03-06 20:45:45
  • #1
After the completion of the construction of my single-family house in 2014, cracks appeared relatively soon inside, affecting the exterior walls.

In case the question arises, we have the following floor structure:
1 cm laminate
5.5 cm calcium sulfate poured screed
PE foil
2.5 cm EPS 035DES
6.0 cm EPS 035DEO
0.5 cm bitumen roofing membrane
16 cm reinforced concrete slab C25/30
PE foil
5 cm perimeter insulation WLG 035
PE foil
Gravel

The walls are made of 36.5 PPW2-0.35 0.08 w/mK

The interior plaster is without mesh (yep, a defect!)
The exterior plaster is properly done.

I could not detect any cracks in the exterior plaster.
Due to the fact that the interior plaster is without mesh and there are no cracks visible in the exterior plaster, I have so far assumed that it can only be an optical defect.
Basically, if the interior plaster were properly done, we wouldn’t even notice the small underlying cracks.

I inspected one of the two most severe cracks with a thin knife; I can push it/stab it deeper into the wall —> see pictures.

All four exterior walls are affected, more so on the ground floor but also a few cracks on the upper floor.

What do you think?

 

Nida35a

2021-03-06 20:58:02
  • #2
Since the cracks are not also on the outside, I consider it a cosmetic defect. There is no painter's fleece or wallpaper on it, and therefore all shrinkage cracks are unfortunately visible.
 

Mycraft

2021-03-06 21:39:35
  • #3
Wait until the house is dry. Putty. Paint.
 

Nutshell

2021-03-06 21:59:31
  • #4
The house is definitely dry, we moved in 7 years ago.
 

Nida35a

2021-03-07 00:12:27
  • #5
When renovating next time, close the cracks, then it should be fine
 

ypg

2021-03-07 00:33:46
  • #6
Happens. If you don't have fleece or wallpaper on it, you'll eventually see settlement cracks. We have them too. That’s the charm of plaster walls :)
 

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