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Only way to go...
Laminates it to the subfloor and fills all airspaces that would otherwise allow the board to move up and down when walked on.
Without the under board thinset, expect grout/tile cracks.
tile may come loose if acrylic is not used in the thinset.
KT
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'74 914-6 2.6 SS #746
'01 Boxster
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