What underlayment should I use with laminate flooring?

All laminate products require the use of underlayment. For products with a pre-attached underlayment like AquaGuard Performance, Sentinel Protect Plus with a built-in vapor barrier is the only warranted underlayment to be used. It is recommended in this case, but not required. If installing over a concrete subfloor, a vapor barrier is also required if the chosen underlayment does not have a moisture barrier built-in. Please refer to the manufacturer guidelines, installation instructions, and warranty information for more details.