Engineered Hardwood Over Concrete- How would you install?

[Patrick M.]

Greetings, BPers- I am halfway through my first buy/hold upfit (a 2-story townhome) and I intend to tear out a crappy carpet and parquet floor downstairs and put in Engineered hardwood from Home Depot. Total coverage will be approximately 410 sq ft. The surface beneath the current floors is a concrete slab that looks like used glue to hold the parquet tiles down. I have not looked beneath the carpet yet but presume concrete continues. Assuming it is all concrete, do I need a vapor barrier **AND** underlayment beneath a floating engineered hardwood floor? Or just underlayment? the HD website is selling Floormuffler Ultraseal Flooring underlayment for $0.65/sq ft. Would installing a product like this by itself be adequate? I am in North Carolina for weather and there does not seem to be any issues from water in the past regarding the concrete.