Hello, I have a question about widening an existing opening in a cinder block wall. The wall itself is none bearing, but roughly 15 feet high. My client wants to open a doorway from current 3 feet, to 6 or 8 feet. I read something about "perpendicular cribbing" and support jacks, though I can't find anything on this particular support. Any help would be greatly appreciated. As far as lintel length needed, actual support system name, etc. We will be using a steel door frame as well. Any help will be greatly appreciated.