Quote:
Originally Posted by pachai
...I am still grappling with the
concern that the Aluminiminimum will chemically
interaction with the tile grout...
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If you put a 1/4" layer of Hardibacker over the aluminum spreader plates, you will keep the cementitious material (thinset, grout, etc.) isolated from the aluminum. Also, the hardibacker is a better thermal conductor than plywood.
-AC_Hacker