Has anyone used MgO board? I used it on my new house, Magnum Board is the brand I used. The reasons I used it are; No paper so it won't mold, much much stronger, two layers of fiberglass. Half inch and you can stand on the back side when on trusses 2' oc.
I always hated gypsum; weak, heavy and falls apart and molds if it gets wet.
It is tougher to cut, of course it is much stronger, I wouldn't use paper tape or water soluable mud as that would defeat the purpose of mold resistant. Magnum Board recommends fiberglass tape and Rapid Set One Pass.
I distribute BuildBlock ICFs and may want to sell Magnum Board, interested in opinions.