For installation over concrete subfloors, use a moisture barrier like CALI Complete underlayment or 6mil plastic for floating installations, ensuring the underlayment is not more than 2mm thick, while glue-down installations require an adhesive with moisture/vapor barrier properties. CALI Aqua Tough Premium Seaboard Oak 22-mil x 7-3/32-in W x 48-in L Waterproof Luxury Vinyl Plank Flooring ( 23.77-sq ft Carton ) in Brown