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Laying tile over cracks in foundation

I am replacing 8 cracked tiles in our kitchen. I removed the tiles and the crack is in the foundation that has been there for about 2 years and the crack is horizontal. The foundation is 6 years old and I have another small crack in our entry way. The crack width is about the width of a dime and appears to be a shrinkage/settling crack. 

What product or process should I use to prepare the concrete substrate for tiling?
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Posted 2018-09-10T19:31:59+0000  by DMR DMR
At the very least use a high polymer additive thinset like Flexbond from Custom Building Products or Laticrete 254 Platinum.  It would be to better to use a anti-fracture membrane like RedGard from CBP or Laticrete's Hydroban.  Understand that with enough movement in the slab, the tiles may crack again in the future.  If that happens, you should consider another type of flooring.

Both Flexbond and RedGard are available from Home Depot.
Posted 2018-09-10T23:02:35+0000  by Adam444
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