You generally do not need an additional moisture barrier under LifeProof flooring over plywood subfloor, as LifeProof has attached pad and is waterproof, but you do need 6 mil vapor barrier over concrete subfloor per LifeProof installation instructions if concrete has moisture. LifeProof luxury vinyl plank, Home Depot private label made by Halstead, features rigid core construction that is 100 percent waterproof, attached pad that provides cushion and sound absorption, and click-lock installation that floats over subfloor, costing 2 to 3 dollars per square foot materials. Over plywood or OSB subfloor that is dry and flat within 3/16 inch over 10 feet, LifeProof does not require additional moisture barrier or underlayment, as attached pad is sufficient and adding extra foam underlayment may void warranty by making floor too soft and unstable. Over concrete subfloor, LifeProof installation instructions require 6 mil polyethylene vapor barrier if concrete moisture exceeds 5 pounds per 1000 sq ft per ASTM F1869 calcium chloride test or 75 percent relative humidity per ASTM F2170, to prevent moisture from affecting subfloor and causing mold, though LifeProof itself is waterproof. Always follow LifeProof installation instructions for your specific product and test concrete moisture. So you need moisture barrier under LifeProof over concrete if moisture present, but not over plywood, and do not add extra underlayment over attached pad.
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