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[–] M346 0 points 0 points (+0|-0) ago 

If I block up an old cistern door in my foundation do I need RE bar?

[–] Irish_Amnesia [S] 0 points 1 points (+1|-0) ago 

Sidewalks and parking lots were my experience, I'd say you don't "need" it unless there is an issue with moisture gathering around the foundation perimeter. That could potentially weaken any blocking you do. I'm likely wrong, but I'd like to know.