Masonry Wall Corrosion

Old 10-10-20, 01:57 PM
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Masonry Wall Corrosion

There appears to be a triangle-shaped pattern of corrosion coming out of the ground. I've also attached my neighbor's backyard and you can see the sprinklers are adjacent to the wall we share but his side, for some reason, is spotless.

Can you tell what's causing the Corrosion?

* Edit: Here are the photos of the front and back of the wall:

Neighbor's side of the masonry.

Our side of the masonry.
Old 10-10-20, 02:36 PM
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Not seeing anything of issue, need more detail!
Old 10-10-20, 03:03 PM
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It no doubt has to do with vapor drive when the sun hits the wet CMU wall.

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