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A 2X4 is and has always been 2" by 4". A dimensional 2X4 is what I think you are referring to and is a sawed 2X4 that has been smoothed to an industry and government approved standard size and finish. I measured some Atlas cork with a micrometer and it was .241 inch which is 20.9 inches using the significant digit rules. I am sure there is tolerance and variations between brands and batches, and I would imagine cork roadbed drys out and shrinks, but homasote is a dense manmade material and should be really closer to 1/2 inch than your results show.
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