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Thank you for your replies, I have laid the foundations minus concrete blocks and will use mortar as is the norm. Dave

I'm about to build a small retaining wall 2 concrete blocks high 17" (430mm) that will have a patio going on top. My question is, can I bed the concrete blocks straight into the concrete foundation rather than using a layer of mortar? Also, I'm planning on having the foundation 4" (100mm) deep...