Definitions for "Building Drain"
Keywords:  drainage, sewer, pipes, conveys, lowest
Main drainage system in a building.
main horizontal sanitary collection system, inside the building wall line, conveying sewage to the building sewer beginning five feet (more or less in some codes) outside the building wall. Building drain excludes the waste & vent stacks which receive discharge from soil, waste & other drainage pipes, including storm water.
The lowest point in a drainage system where the interior drainage pipes meet and are conveyed it to the sewer.