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obobsmith
Welcome to the forum,best site internationally as far as I'm concerned(no offense Mr Bridges)I'd also consider sealing your travertine/limestone before you staet setting to save on the chance you might stain your tile when setting,natural stone drinks like a good Englishman,also be sure to use white thinset or your sure to get headaches from your tile sucking up thinset from the bottom.Good luck.
bootsmckiber (Canada) :hurray:white thinset
:mad2: grey thinset
Also make sure you back butter tiles so that you don't get the trowel marks coming through and shading your lovely trav/limestone."Natural stone drinks like a good Englishman", no problems then.
Thank the lord it choose's not to drink like a Scotsman or it would cost you lots more:yikes:.
It is probably best you don't take the DIY route even cheap stone is an expensive mistake.