Quote:
Originally posted by porsche930dude
If theres one thing iv learned about tile. Its that you can never have too much mortar. Especially on 12" or bigger tile. so get the biggest tooth trowel you can and go to town 
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Finally!! Yes!!
The biggest mistake do-it-yourselfers make, is using too small of a trowell. Just last night on one of these home improvement type shows, they were using a 1/4"x1/4" square notched trowell, combing it on the back of the 18x18 travertine tiles and then setting it over radiant heat netting/element. I wanted to scream.
I use a 1/2"x1/2" on 12" or bigger flat back floor tile.
The saltillo clay floor tiles I'm currently finishing up get the 3/4" round notched trowell as well as "back-buttering" them flat with a 18" swimming pool trowel.
I get about 40 square feet per 50# sack of thinset.
It is a 1000 square foot job.
Do it once!!
KT