Lapping is a process in construction where two or more layers of a material, such as concrete or mortar, are placed on top of each other, with the upper layer overlapping the lower layer. In the context of your foundation cost estimation, lapping might refer to the overlap between consecutive pours of concrete. This overlap is typically specified to ensure a strong bond between the different sections of the foundation. Here are some general guidelines for lapping in concrete foundations: Lap Len