Why do (notch) cracks occur in houses?

genius333Bygenius333

Hello everyone out there,

I recently read an article on the Internet about notch cracks in buildings, as the topic always amazes me.

In the article (link at the end of the text), the following was added regarding notch cracks: "When the masonry undergoes thermal and/or moisture-induced length changes, other deformations ( stresses ) occur in this area, which are " discharged " diagonally – a crack is formed."

I would be very interested to know why the described voltages are actually discharged diagonally, i.e. at the corners of such openings (windows etc.) and not at another point, for example in the middle of the respective spans?

Could it be due to horizontal or vertical forces acting on it? Although I wouldn't be able to explain it, since with such forces, the weakest point would always be the first to give way, which, in my opinion, would be the middle of the largest horizontal or vertical span, right?

Maybe one of you experts can help me here:)

Thank you in advance 🙂

https://www.heimwerker.sakret.de/rat-und-tat/lexikon/kerbrisse#:~:text=Kerbrisse%20sind%20diagonal%20running%20cracks, unloading%22%20%E2%80%93%20a%20crack%20is created.

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wmsieger
wmsieger
4 months ago

If I don’t fool myself then because:

  • not properly compressed
  • the floor is always in motion.
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newcomer
newcomer
4 months ago

in some houses there is the foundation because it has either not been sufficiently compressed or the ground is flooded or or or.
If, so to speak, no substrate stops in the middle of the wall, it floats in the air to say a bit

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newcomer
newcomer
4 months ago
Reply to  newcomer

https://www.ploetzlichbauherr.de/setrisse-putzrisse/

Cracks on the inner wall or outer wall of a house occur again and again. While most of these cracks are harmless, there are also dangerous ones that greatly impair building stability. These include the setting cracks that are often confused.

For not every crack that we call a rupture is also one. In the first years, there are plaster cracks in the building. But what can we distinguish between simple plaster cracks and fix them?

JULI 28, 2022

COMMENTARY

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Cracks on the inner wall or outer wall of a house occur again and again. While most of these cracks are harmless, there are also dangerous ones that greatly impair building stability. These include the setting cracks that are often confused.

For not every crack that we call a rupture is also one. In the first years, there are plaster cracks in the building. But what can we distinguish between simple plaster cracks and fix them?

Content of the article

What are the differences between set plans of plaster cracks?

Cleaning cracks are superficial cracks of the plaster layer. They often occur in new buildings when the material is still working on the wall and the plaster is not completely dried.

In principle, three types of plaster cracks are distinguished:

  • Bags:Sack cracks are between 10 to 20 centimeters long and usually run horizontally.
  • Shrink cracks:Shrink cracks have a net-like appearance and can be up to 0.5 millimeters wide.
  • Wind cracks or greases:Wind or fat cracks are net or y-shaped cracks. The fine hairline cracks on the plaster surface have a maximum width of 0.2 mm.

If the cracks on the wall are wider than just described, then it can be set cracks.

How do you recognize a setting plan?

Setting cracks run along the static vulnerabilities of a house. They pull through a wall in a horizontal, diagonal and vertical direction. Often the setting cracks occur on windows and doors. Generally, however, setting cracks can occur everywhere at the house, i.e. both on an outer wall or also inner wall. Even in new buildings, setting cracks can occur.

It is not always limited to a place of the house. Depending on the overall design and cause, they can occur simultaneously at several points.

How do we create set cracks or plaster cracks?

A set-up plan or set-up plan is created, as the name already reveals, by uneven placements in the building ground. Causes of this can be:

  • If water cannot flow properly under the building wall.
  • The groundwater level changes.
  • Through shocks caused by an explosion or inheritance.
  • An inadequate load capacity of the substrate. This is the case, for example, in soils with an inhomogeneous structure (tone, clay).
  • The floor breaks away laterally as a result of large forces.
  • The soil investigation was faulty and consequently the foundation calculation and planning is incorrect.

As already mentioned, ruptures can greatly impair building stability.

On the other hand, plaster cracks depend on the processing of the plaster mortar. Further causes for the superficial cracks may be:

  • Sitting ofRoofand walls in the new building. There is always the risk that cracks are formed at the transition points. This happens very often in the attic at the transition from wall to rigip plate.
  • Hygric and thermal volume changes of the plaster base, for example by moist wood wool lightweight panels.
  • Different materials in the background. This occurs when bricks and concrete have been installed with different suction, swelling and shrinkage characteristics as well as various thermal properties.
  • The plaster substrate is uneven or the plaster thickness changes. For example, this is possible with insufficiently mortared wide joints.
  • Acute the plaster substrates differently (absorb moisture). This has an effect on the strength of the plaster.
  • The plaster fabric was saved and therefore the overlap is missing or insufficient.
  • The residual moisture of the masonry was too high when plastering. As a result, the applied plaster does not achieve its maximum strength. The wall only dries gradually after plastering, whereby the material disappears.

Fine plaster cracks or hair cracks on inner walls are unobjectionable and not more than beauty defects.

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