Tile foyer

Hello All,
I am going to lay a new tile foyer. I have removed the existing wood floor (damaged from weather) down to the plywood underlayment. I am not sure about size of underlayment.
I also took off the asphalt moisture barrier as well.
I intend laying 1/4 hardiboard over the plywood. I would like to lay thicker but only have 3/4 to work with.
My question to you all is should I put down another moisture barrier? There is a crawl space underneath that already has a barrier on it.
Thank you very much
rik
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I'm not sure what the group thinks about "Rhinoboard" from Custom Building Products. Its less than 1/4 inch, very solid with great moisture resistance. I think you can lay it on 3/4 inch subfloor - but I can't quite remember. I used it recently in a bathroom installation. I really enjoyed working with it and I am very pleased so far with the results...but of course its early.

floor
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