There's a lot more to think about when installing laminate flooring than just the final colour of the floor. The underlayment is a layer that can be made from different materials, whose main purpose is to keep moisture from reaching your laminate and reduce the noise that comes from walking on a hard floor.
Underlayment is especially important when working with concrete subfloors, which can release moisture more than other flooring materials, especially if it isn't cured properly.
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