Does plain concrete's finish affect how much it echoes sound outdoors?

Only marginally — a hard, smooth trowelled finish reflects sound slightly more than a textured broom or exposed aggregate surface, though this difference is genuinely minor in an open outdoor setting compared to an enclosed space.

If acoustics genuinely matter to you (near an outdoor entertaining area, for instance), a textured finish offers a very small benefit, but it’s not typically a primary factor in choosing a finish.

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