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Re: tile roof mortar
Jerome,
I got that from Reese Moody years ago (he was the engineer for Monier, maybe still is?) and from their installation instructions. He said that the tile is intended to keep approximately 90% of the water out from under the tile, the waterproof covering underneath (the 30/90 hot mop) keeps the rest of the water out - helping keep that 90% of the water out is that mortar pointing of openings.
I'll see if I can find anything I still might have.
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