Hey guys, have buddy who is a contractor and is going to install an egress window to an existing house. Wants me to build retaining wall for the well walls, no problem. Question is, just curious if any of you guys have done this before, and anything i would have to watch out for. dimensions would be 4' high/3' out/6' wide. I don't think I would need to grid it, but will look into it more. Let me know what you guys think, thanks guys.