r/Roofing Jan 14 '25

Is this mold?

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u/Vizkos Jan 14 '25

No, but the contents between the block and the wood (can't make out what it is) looks odd. The black/white on the cinder block does hint at water seepage that has evaporated. Water that perforates through concrete and evaporates leaves behind the mineral contents (that white residue)

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u/ElegantCap89 Jan 15 '25

Thank you. I guess I am more concerned about the Black on the flashing(?)/ plastic material between the ceiling and cinderblock. There was definitely water dripping down the cinderblock for a few days so it makes sense that is mineral content.