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I don't think that I would use concrete, because the base would become one solid unit, unless you put expansion joint at every block. The whole point of the mortar is that each block is still independent from one another and able to move with the freeze thaw. Concrete would have much bigger sections move and I would think would cause problems.
As far as the step up, I asked the same question of the rep.. He said that if you mix the mud a little thicker in that area it will not be a problem.
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Matt
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