And thanks for :
And by the way, it's "their" not "there"...
That goes on in many of the threads everyday, and makes me crazier........
Do you here me over their?
Wasn't that learned in 5th - 6th grade?
I would not add a threshold when setting more tiles. What would be the purpose?
The difference with the thin set under the Hardie will make it about 1/16" higher at most. But, are you using the same tiles? If not it may not matter, probably won't matter anyway. Will you have a "seamless" continuation to the other room? You got pics?