What are these rusty metal pieces in my staircase walls?

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Discussion Overview

The discussion revolves around the identification of rusty metal pieces found within the walls of a staircase in a residential flat. Participants explore potential explanations for the presence of these materials, considering various construction techniques and structural elements. The scope includes conceptual understanding of building materials and structural integrity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes finding rusted iron rods or twisted wires within the plaster of the staircase walls, questioning their purpose and safety.
  • Another participant suggests that the materials could be staples used to attach sheet rock or iron netting for plaster support, depending on the wall type.
  • A different participant proposes that the materials might be wall ties used to connect masonry walls, especially if the building is older and has damp issues leading to rust.
  • Some participants express uncertainty about the construction methods used in the building, particularly regarding the presence of metal mesh or staples in the plastering process.
  • There is a mention of the building's age, with one participant noting they have lived there for 12 years, suggesting it is not more than 13 years old.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact nature of the rusty materials. Multiple competing views are presented regarding their purpose, with some suggesting they are wall ties while others consider them to be related to plaster support. The discussion remains unresolved.

Contextual Notes

Participants note the irregular spacing of the materials and the potential for rust due to damp conditions. There is also a lack of clarity regarding the specific construction practices in the region, which may affect the interpretation of the findings.

Wrichik Basu
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First, I am not an engineer, nor am I formally studying the subject. So, please pardon my ignorance.

I recently found these in the walls of the staircase in our flat:

20190309_215727.jpg


The walls of the staircase had not been painted properly by the builder. Due to water seepage and damp, parts of the plaster have absorbed water and swollen up. When I hit them slightly, they broke off, revealing the material inside.

The question is, what are these? Inside the cement, there is some kind of iron rod or twisted wires, that is rusted. They are barely 3mm inside.

My father is a civil engineer. He inspected and said that since these were further away from any beam or column, they would not harm the structural integrity of the building. But he is not sure about what they are.

These are not electric wires, because wires won't go like that. Neither are these parts of beams or columns. But they are visible on all the four walls of the staircase to the terrace: swelling up, breaking on hitting, with rusted iron inside. But these are visible only on the staircase walls - not inside our house.

Anyone has any idea what these are?

If it is related to earthquake protection, then I can say with 99.99% surety that our flat hasn't been built keeping earthquakes in mind (Kolkata is in Zone III according to this).
 

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Are the walls plaster, or are they sheet rock (wallboard)? If the latter, then these look like staples that hold the sheet rock to the beams underneath. If they are plaster, then these are probably the iron netting that was applied to support the plaster. Are they regularly or irregularly spaced? In either case, I wouldn't worry about it. I would just apply patch to these and re-paint. It looks like mainly surface rust.
 
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phyzguy said:
Are the walls plaster, or are they sheet rock (wallboard)? If the latter, then these look like staples that hold the sheet rock to the beams underneath. If they are plaster, then these are probably the iron netting that was applied to support the plaster. Are they regularly or irregularly spaced? In either case, I wouldn't worry about it. I would just apply patch to these and re-paint. It looks like mainly surface rust.
Um, it's regular wall plaster. There's no sheet rock. Bricks laid with concrete, plastered and painted. And they are irregularly spaced.

Actually it's not about worrying; I am interested in knowing what these are. If the walls are made of bricks and concrete, why should it have iron? Am I missing something?
 
Is this a new or old building?
What is behind the staircase wall(s)? ie a wooden framing - probably not.
Or is the brick wall a structural load bearing wall,

I was thinking that what you see is a 'wall tie' that is used to hold two walls together, one at least being masonry,

If structural, then a tie for a veneer of brick that was never built and plastered over with the ties cut off rather sloppily,
Galvanized ties eventually rust in damp environments.
 
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Wrichik Basu said:
Um, it's regular wall plaster. There's no sheet rock. Bricks laid with concrete, plastered and painted. And they are irregularly spaced.

Actually it's not about worrying; I am interested in knowing what these are. If the walls are made of bricks and concrete, why should it have iron? Am I missing something?

Here in the US, a metal mesh is often applied to the wall to help hold the plaster in place, like in the attached photo. I don't know if that is the case in your house or not. If it is, you could be seeing the metal mesh, or staples that hold the metal mesh to the underlying bricks.

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plaster-mesh-expanded-wall-plaster-mesh-diamond-metal-lath-wpm-plaster-wall-wire-mesh.jpg
 

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256bits said:
Is this a new or old building?
We are living here for 12 years, so it's not more than 13 years old.
jim mcnamara said:
I think @256bits is correct. It probably is one of these:
https://www.designingbuildings.co.uk/wiki/Wall_ties
Could be. Since I haven't seen the walls being built, it could be one of those.
phyzguy said:
Here in the US, a metal mesh is often applied to the wall to help hold the plaster in place, like in the attached photo. I don't know if that is the case in your house or not. If it is, you could be seeing the metal mesh, or staples that hold the metal mesh to the underlying bricks.
I haven't seen that being done anywhere here, so I guess that's not the case.