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Old 09-08-2007, 12:30 PM   #2
Veteran DIYer -- Schluterville Graduate
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Join Date: Dec 2006
Location: SE Tennessee
Posts: 8,879
Welcome, Scienceguy.

Please give us a first name to call you by.

Before we get to the thinset, please tell us more about your floor. Since you put down cement board, I assume the floor is joists and layers of plywood. For a natural stone material like slate, your subfloor has to be pretty stiff. Have you checked your joists with the Deflecto ? Additionally, stone usually requires properly installed subfloor layers equaling at least 1 1/8" thick.

Tell us about your cement board installation. Did you use thinset between the subfloor and the cement board?

Sorry to bombard you with so many questions, but you'll want to make sure you're on solid footing before you proceed further. No thinset in the world will help if you're not.
Dan - a DIYer in SE Tennessee
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