wrote:
Oops... a follow-up....
The top layer is not 1/4" luaun, it is 1/2" plywood....
so the total floor is 1" PT decking, covered by 1/2" plywood.

I will add 1/2" hardibacker...

Tips/Pointers/Risk factors?

--Paul


I recommend porcelain, the Hardibacker and that you check this:
PEI ratings: http://www.floorstransformed.com/choosetile.html
Delfection Limitations: http://www.ttmac.com/deflection_limitations.htm