The plan was to put a 1/2 inch sheet of plywood as a backer board for the mirror. The mirror and the backer board would be held against 1X2 frame attached to the trim of the existing TV hole.
Today I went to get the wood to cut the 41X33 backer board from.
I realized that even 3/4 plywood will warp not a good thing if the mirror is masticed to it.
What would you recomend for a backer board?
I have talked to several people with ideas all over the board. from sheet rock to no backer.