How much should the edges of under-layment overlap under a wood floor?

The appropriate overlap of underlayment edges under a wood floor is typically recommended to be 4 inches. This amount ensures that there is adequate coverage to prevent moisture from seeping through the seams, which is especially important in areas subject to fluctuating humidity and temperature. By providing a 4-inch overlap, you create a more secure and stable base for the flooring, reducing the risk of potential movement or gaps that can occur if the edges are not sufficiently overlapped. Additionally, this overlap helps in minimizing sound transmission and enhancing insulation properties, making for a more comfortable living environment. Proper installation practices such as these are essential for the longevity and performance of the wood flooring system.