Does anyone know what this stuff might be on the concrete brick. This was on the inside of the house in the basement. I was thinking efflorescense maybe but not sure because it seems a bit thicker.
You are correct. It appears thicker because it was painted over, (likely with a moisture blocking paint which makes the issue worse), in an attempt to hide it. The fact it is ‘growing’ indicates the mositure intrusion issue is ongoing.
Thanks Jeffrey, which makes sense because there were only 2 downspouts and they both terminated at the foundation cornerns.