Posted by Greg Coffin [67.176.56.44] on Sunday, October 11, 2015 at 20:50:11 :
In Reply to: O.T. Mortar or thin set posted by bill in pa [70.199.4.194] on Sunday, October 11, 2015 at 20:29:45 :
If the back of the stones is relatively flat I would use thin set with a 1/4" square notch trowel, and butter the backs of the stones to get better adhesion. I'm not a tile-setter, but I watch my tile guy do it all the time.