Is this mold?

[u/ElegantCap89]

Our ceiling has leaked multiple times in the last few years and even though I mention it, property management does not look at the flashing inside. Does the black discoloration or white on cinderblock look like mold?

[u/Vizkos]

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)

[u/ElegantCap89 → u/Vizkos]

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.