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No you don't need a mortar bed. if you have existing cement slab, then all you need to do is make sure to check for uneven spots, cracks and fill them in. You can also use self leveling products like levelQuick. Then your good to tile. You could have cracks later develop in your tile due to slab still settling or soil problems. There's different types of products out there to solve that problem.

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Q: Is a mortar bed needed to install standard 12 tiles to a cement slab foundation?
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The proportion of the bed mortar should be 4:1 for the sand : cement.


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