Quote:
Originally Posted by drew1
Screwed down hardie board with no grout under it. Did I mess up?
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I'm afraid so.
Without the mortar under the board, no 20 year manufacturer warranty.
The mortar underneath fills all of the voids and improves the mechanical bond.
What typically happens, is that cracks will eventually form on the tile surface at the backer joints.
If you used a porcelain tile with an acrylic modified thinset, you'll have a better chance.
Sorry,
KT