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D Rapp - will the soldier course also be sitting on Brussels Dimensional Stone? If so, then yes, adhesive will be needed. If it's just sitting on the base prep, no adhesive is needed.
As for depth of base, we like somewhere between 6-8" or more depending on the situation.
One of the biggest mistakes I see time and time again with homeowners tackling their own projects is neglecting embedment of block. Your bottom course of block for any wall should be sitting below grade - so often I see walls where the bottom course is sitting atop several inches of stone and is several inches above grade. Predictably, the wall moves and fails within a year.
Make sure you don't duplicate this misstep or you'll find yourself having to rebuild in a year.
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