Do you need a vapor barrier when installing laminate flooring over hardwood?

Yes, it is recommended to use a vapor barrier when installing laminate flooring over hardwood. The vapor barrier helps to prevent moisture from the subfloor or the hardwood from affecting the laminate, which can lead to warping or damage over time. Additionally, it can provide an extra layer of cushioning and soundproofing. However, ensure that the vapor barrier is appropriate for your specific installation conditions.