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Unread 11-01-2018, 01:29 PM   #134
wwhitney
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Join Date: Dec 2015
Location: Berkeley, CA
Posts: 1,102
But your posted accounting has different mortar thicknesses on the two assemblies, so the 0.7 multiplier will make a difference.

3/4" plywood is not 3/4" thick, it may be 23/32" or sometimes even 11/16".

As to making up a 1/16" difference, I would think you could do that by adding a little more or less thinset under the tiles on one side of the assembly, just over a one or two foot wide transition zone.

Also, I haven't been following your thread, so perhaps you already answered this, but what is the purpose of the 1/4" hardibacker in both assemblies?

Cheers, Wayne
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