Bill,
I would advise against going with a plywood/homasote/homasote roadbed sandwich
because sheets of homasote vary considerably in thickness. In contrast, I think
a 3/4 ply plus homasote roadbed sandwich would be ideal. I was forever sanding
and filling the joints between homasote sheets to get them level with each
other. Sanding homasote will fill your basement and lungs with nasty dust. The
homasote roadbed is milled and thus maintains a consistent thickness.
I get why people use sheets of homasote for yards--we did--but I would never,
ever use it for anything else, and I'm not sure I would use it again for yards.
You will get excellent sound deadening qualities with the ply/homasote roadbed
sandwich, so adding another layer of homasote would be unnecessary and
expensive.
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