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Central Delray is the older half of the city: established single-family neighborhoods off Swinton and Congress, plus the service corridors that run between them. Much of that concrete was poured slab-on-grade without a vapor barrier.
So the first step here is measurement, not material selection. Vapor emission is tested to ASTM F1869 or F2170, and slabs above the coating's limit get a mitigation membrane before anything decorative goes down.





