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So lately I noticed a lot brick dust in my basement walls-should I be concerned? The house is a 100 year row house. [enter image description here2 [enter image description here]3

  • Are the pictures showing a whitewashed parged coat (a layer of mortar) over brick walls? Or, as is more likely with a circa 1917 home, are the walls concrete? – James Olson Jan 22 '17 at 21:37
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Of course a photo would help. :)

But sans photo or any further details, my guess is you are seeing efflorescence which is essentially mineral deposits left from the migration of moisture passing through a porous wall (cement, brick, stucco, etc.)

  • Efflorescence is always crystalline; usually white (unless stained by ie. iron oxides). – James Olson Jan 22 '17 at 21:24
  • Yep. Posted my answer prior to photos. – DA01 Jan 22 '17 at 22:00
  • I know. Just clarifying, for others, in case they didn't appreciate importance of pics & "brick dust" being brick coloured. Efflorescence is often the answer when it isn't spalding. – James Olson Jan 22 '17 at 22:06
  • Soooo... is this normal or should I take some action steps? – ecco88 Jan 22 '17 at 22:52
  • @ecco88 I don't know if what you are showing is efflorescence or not. It's hard to know what I'm actually looking at. We need more details here. That said, if it is efflorescence, that's a sign of moisture migrating through the wall. That's somewhat normal in basements. – DA01 Jan 22 '17 at 23:35

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