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I have recently moved to a new apartment and I am planning to mount a TV in the living room. The apartment walls are dry lined. Right in the middle of the designated place for the tv, the dry wall seems to have like a seam, but what is strange to me is the sound and vibration less of the drywall at that point. When I tap with my hand the drywall does not vibrate at all, and the sound is like there is a plastered wall behind. This area appears to be 15-20 cm wide from what I can tell. First of all I am not sure what is behind the drywall at that point:

  • Is that a concrete column of the apartment?
  • If so, is it possible to drill holes? I suspect I need a powerful drill to make a hole there.
  • Is it safe to install the TV wall bracket? Am I allowed to make holes into it?

The difficulty that I am finding is that I have a stud detector (which usually is not so accurate) and close to this seam it is really not accurate, so I do not know how to proceed here. Any help is very welcome.

Additional info: The apartment is in Ireland, the development has 4 floors my apartment is in the ground floor. The distance of the seam from the external wall is around 220 cm. While the wall itself is around 7m long. Through its length there is only the innermost edge of this wall that makes the same sound. The walls are dry lined with studs. I have previously mounted stuff on the studs before (not on this wall).

Thank you.

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    We can guess at much of this, for better or worse. But as far as whether you are allowed to make holes, check your lease or ask your landlord. Commented Oct 25, 2020 at 22:24
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    I own the place
    – Sanandrea
    Commented Oct 25, 2020 at 22:29
  • Ok. That helps a LOT. Commented Oct 25, 2020 at 22:33
  • Is it usual/normal for the plasterboard to be placed directly over the concrete column?
    – Sanandrea
    Commented Oct 25, 2020 at 22:38
  • I have seen that type of thing. Basically, build it out (studs) in front of the rest of the wall such that the drywall can go right in front of a column. The alternative, which I have seen a lot, is to box the drywall around a column - which is more work but might mean less wasted space elsewhere. No "right" or "wrong". Commented Oct 25, 2020 at 22:44

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Brick, poured concrete, concrete block are all likely possibilities in a 4-story building.

The solution generally would be the same on all of them: Hammer drill + an appropriate type of fastener. There are a number of different types. One popular one (at least in the US) is Tapcon:

Tapcon screw

though in this case, I would head over to my local hardware store to see the options first-hand and, if you can find someone there who knows what they are doing, get some advice.

I would consider cutting out a small square of drywall around each fastener location so that you are drilling directly into the brick/concrete/block. Otherwise you may get quite a mess trying to drill through the drywall into the other surface.

Depending on the specifics, sometimes it makes sense to cut out a large section of drywall, attach a piece of wood using appropriate screws and then mount the TV to that wood with wood screws.

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  • thank you very much. I am thinking, this might be out of my reach as DIY.
    – Sanandrea
    Commented Oct 26, 2020 at 8:55

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