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I was surprised to see the seams of all of these tiles all lined up. Is there a provision under the tiles for any moisture that gets between the columns of tiles?
Unless I'm reading the above answer to your question wrong, it looks as if there's a bit of miscommunication. JDMjunky does indeed have a waterproof 'underroof' with free airflow, but that doesn't mean that the seams you see are actually all-the-way through the tile. Under the flat part, there's an overlapping section with ribbons that avoid water getting through the seam. The ribbons channel it to the tile below. See his pic of the tile here:







