Does exposed aggregate need a different sub-base than plain concrete?

No — the fundamental sub-base preparation (compacted crushed rock base, proper compaction) is genuinely the same for exposed aggregate as for plain concrete, since this is about supporting the concrete structurally, not related to the surface finish.

The exposed aggregate finish is achieved through the concrete mix and surface treatment during finishing, not a different underlying construction approach — proper base preparation matters equally for either finish choice.

Skipping proper base preparation is a genuine risk regardless of finish choice — a poorly prepared base leads to settlement and cracking whether the surface is plain or exposed aggregate.

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