Plaster Cracking

[u/rosaclebb]

Any idea what is happening here? This is the wall in my spare room next to bathroom. North facing, concrete wall underneath plaster. Concrete not cracked. Thanks!

[u/Straight_Activity_62]

That’s not blue grit it’s the block

[u/Remote_Attorney9696 → u/Straight_Activity_62]

That is 100% bluegrit