Ours didn't require underlayment either, but we did it anyway just because our foundation is conventional and not slab. Plus where we live is 100% humidity much of the time. The one we got was actually more expensive per square foot than the floor itself was but I'm so glad we bought that one. It's plastic on one side and a thick foam on the other side. Not sure if the name of it.

Maybe it's the type of laminate or the thickness itself that makes a difference??

Not sure.

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