re: What to do prior to laying paving stones...

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You probably right, but he said 15’- 20’ sf. So that’s like a 5x4’ area. Max

He doesn’t have to overthink this.

OP could have probably have this completed in less time than keeping up with this thread.

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Yeah, with a space that small, just spray for weeds, lay down a barrier, add sand, and lay pavers. Use a big 2x4 to drag across the top to get it level. If you wanted to get real fancy, use some posts in the ground and put 2x6 framing around it to keep the stones from shifting. I did that for a larger patio and years later it still looks good. I used 16 inch pavers and did an 8x12 area.