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 Brown 22-mil x 7-3/32-in W x 48-in L Waterproof Interlocking Luxury Vinyl Plank Flooring (23.77-sq ft/ Carton)