ᐅ Visible joint pattern on the plaster surface.

Created on: 15 Feb 2020 09:19
C
cgonsior
Hello everyone,
I have an appointment with my site manager next week. Before that, I wanted to gather some opinions and maybe someone has already experienced the same issue or at least seen it before.

The problem is as follows:

Last week, when it was raining very heavily and the wind was quite strong, our facade suddenly looked like this (see photo). You could clearly see the joints of the blocks through the render and there were slight cracks in the base area. Does anyone have any idea what this could be? Could this indicate a construction defect? For example, an insufficient base coat thickness?

Details about the house:

Year built: 2016
Masonry: 30 cm (12 inch) Ytong blocks, glued
Render: according to the building plan, 15 mm (0.6 inch) base coat and 3 mm (0.1 inch) top coat

Außenwand eines Hauses mit der Nr. 9, kleinem schwarzen Würfel und Fenster rechts.


Graue Hauswand mit weißem Fensterrahmen, horizontalen Lamellen und Kiesstreifen am Fundament.
B
Bookstar
15 Feb 2020 18:05
Oh yes, the heat pump shouldn’t be placed like that; the distance to the house is definitely too small. I would also be concerned about the cracks—I just took another look at them.
D
danixf
15 Feb 2020 18:59
Bookstar schrieb:

Oh, and the heat pump probably shouldn’t be placed like that either; the distance to the house is definitely too small. I would also be concerned about the cracks, I just looked at them again.
Is there some kind of guideline or regulation for this? At our neighbors’, they usually have it placed like that everywhere ops:
Tarnari15 Feb 2020 19:15
If I may briefly return to the main topic.
A post a bit earlier reads as if one must generally expect such a result with aerated concrete and a gray facade, or how should that be understood?
We will be building with aerated concrete and are considering a gray facade.
H
halmi
15 Feb 2020 19:19
No, you don’t have to. If it’s done properly, you won’t see anything at all. Problems usually occur with rather thin bricks of 24cm (9.5 inches) or 30cm (12 inches) that are plastered too thinly.
B
Bookstar
15 Feb 2020 19:57
It doesn’t matter whether it is aerated concrete or clay blocks. We are using 42.5 cm (17 inches) clay blocks, and depending on the weather conditions, the bricks are quite visible. This is normal, but the extent shown here is somewhat unusual.
Tarnari15 Feb 2020 20:02
Is there a way to prevent this?
I have never consciously seen anything like this before, but I was quite shocked when I saw the pictures.