looking for feedback from anyone who has experience pouring a radius wall at a 12 foot elevation.I would like imformation on required bracing and pouring. thanks roch

Roch - be glad to discuss with you -- have done many. If you would like to talk pm me and I'll forward my cell number. Re the forum I use a different block and generally (but not always) purchase the block pre-cut for a given radius. Regards.

Install a complete course at a time, I use 1/4" plywood ripped into 4" strips to diaphragm it together, be prepared to make adjustments a few times on the first couple of courses, once these are perfect the rest goes easy and plumb. once done I diaphragm the inside as well with same strips of plywood, install braces and it remains stable for the pour.

That's my preferred method, I am sure there are others. I have seen people use just foam and tape, with the block being manipulated so much I get concerned over strength when concrete is placed.