ACI Flatwork Finisher Practice Questions - ACI Concrete Flatwork Finisher Certification Exam

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A vapor retarder (10-mil polyethylene) is being installed directly under an interior slab that will receive vinyl flooring. Where should the concrete be placed?

On a sand cushion placed over the vapor retarder Directly on top of the vapor retarder With the vapor retarder placed on top of the fresh concrete Only after the vapor retarder has been perforated for drainage

Correct Answer:

Directly on top of the vapor retarder

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