As others have stated, I too have 1/2" birch plywood with Homasote glued and screwed with sheetrock screws on top. No issues at all. One thing I did notice is that I saved some pieces of Homasote from my previous layout and when mating them together with the new homasote on the new layout there was a slight difference in thickness. Also some of my sheets do have thickness variations throughout the the same sheet, although not enough to take notice. I purchased mine at Lowes here in upstate NY.
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