If it's framed conventional, it doesn't need backers. There's wood in the proper places. You can use pretty much anything that will hold a screw: 1by, 2by, plywood, angle, tube, what have you. If you're cheap, you can just float the corners which is how sheetrockers sheet ceilings as long as you dont exceed 24".
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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