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Old 03-01-2011, 02:39 AM   #4
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
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Hardi allows the use of a dry-set mortar applied with a 1/4" notched trowel between the subfloor and Hardi, but recommends a modified thinset between the tile and Hardi. http://www.jameshardie.com/homeowner...rterInch.shtml

Believe it or not, they also allow the use of mastic with a 5/32 V-notch trowel...but I wouldn't bother with it. It's too expensive.

To save a few bucks, you can use dry-set mortar under Hardi, but if you want to simplify things and deal with only one thinset, use a modified thinset like 253 Gold for both applications.

Rialto is a porcelain tile that has deep depressions on the back. It's important to skim-coat the back of each tile with the flat side of the trowel immediately before setting it. This will help attain maximum thinset coverage.
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