3/4 solid hardwood over gyp-crete?

do i need to screw down 5/8 or 3/4 ply over the gyp-crete? The gyp-crete is about 1/4 to 1/2 inch thick. The gyp-crete is laid over a 3/4 inch OSB sub floor.
thanks for any help.
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What are you trying to do?
5/8 ply is normaly glued and screwed to OBS flooring then use to adhire tile to. you can adhire tile to gyp-crete
Travis
snipped-for-privacy@gmail.com wrote:

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I am trying to install 3/4 inch solid hardwood flooring.. but if i nail directly to the gypcrete then the nails would bend and/or the gypcrete would crack all up. should i screw ply to the gypcrete then nail the 3/4 solid hardwood planks to the ply? thank you.

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I would remove the gypcrete.
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