What is this at the base of my balcony wall?

close up of column base

wider angle of column base

wide angle of column base

  • the pics you posted do not work. Use the mountains and moon icon to add pics to your question.
    – RMDman
    Commented Apr 19 at 13:54
  • I've edited to make actual links out of your images, then attempted to use the built in hosting system (which is always preferred), however, the thumbnails that are linked are considered too small to be posted. Please edit your question again, then use the "sun & mountain" icon to embed full size copies of your images in the question itself. Using BB-Code to embed images doesn't work here as this site doesn't use BB-code
    – FreeMan
    Commented Apr 19 at 13:57
  • What is the wall made of? Concrete? wood? It looks like there was water damage from rain on the balcony floor, but that is just a guess. It could be primarily cosmetic or something more serious depending on the material used in the construction of the wall.
    – RMDman
    Commented Apr 19 at 14:02
  • It's not at all clear what you're asking about here. Please take properly exposed photos and describe more clearly your concern. All I see is some forming or troweling ripples in what's either plaster or concrete.
    – isherwood
    Commented Apr 19 at 14:09
  • Thanks all greatly appreciated. Freeman - thanks for fixing the links. RMDman - The wall is made of concrete I believe. Does that mean it’s likely a cosmetic issue?
    – Nick
    Commented Apr 19 at 14:31

1 Answer 1


This looks like a poured concrete wall, and the marks look like the imprint or 'ghosting' left from the plywood used to make the forms. The plywood was probably left outside for too long, got wet and delaminated, leaving that imprint on the concrete.

enter image description here Image from https://basc.pnnl.gov/

  • If you really care, you can grind it flat and repaint it. I wouldn't bother.
    – gbronner
    Commented Apr 19 at 14:24
  • Thanks Cheery! Much appreciated! I believe it is a poured concrete wall. The straightness of the lines did make me think it was a man-made issue rather than water damage. Don’t often get lines that straight in nature…
    – Nick
    Commented Apr 19 at 14:35
  • Thanks gbronner- agreed.
    – Nick
    Commented Apr 19 at 14:35
  • 2
    @Nick It is water damage, but to the forms, not the concrete. It will have no effect, except cosmetic.
    – Cheery
    Commented Apr 19 at 14:41
  • @Nick -- think of it as a bit of character ;) its not like buildings aren't allowed to have that any longer Commented Apr 20 at 1:28

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