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Slate tile outdoor installation subfloor

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  • Slate tile outdoor installation subfloor

    I have a balcony with 12 inch on center framing, 3/4 inch cured CDX plywood, with PVC sheeting glued down on top.
    My question is:
    What do I need to put on top to set my 12X12 Slate tiles?
    Mortor Bed? If a mortor bed how deep?
    Cement Board? Hardi Backer Board?
    My concern is NO LEAKING through to my deck below. I want a water TIGHT seal.
    Please help.
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